The claim that the invention of literacy has cognitive consequences, so-called Literacy Theory, is subject to the criticism that it implies a form of technological determinism. This criticism, however, assumes an outdated Cartesian model of mind, a mind independent of the body and the external world. Such an internalistic framework leaves unexplored the cognitive consequences of the material dimension of writing. Therefore, in order to dismiss the accusations of technological determinism, the Cartesian model of mind and cognition needs to be (...) reconsidered. The paper demonstrates how the framework of situated cognition helps to account for the cognitive consequences of written artifacts themselves. Material characteristics of written vehicles such as spatial and temporal stability of the content, fixity of information with reference to page boundaries, lightness and small size of paper sheets, and spatial layout of documents make up the most relevant material factors enabling the distribution of cognitive work. (shrink)

The aim of the paper is to distinguish and explain some imprecise expressions indicated by prof. Anna Jedynak. Moreover the paper is focused on the fundamental disagreement between the author and his critic, which is the meaning of the term "incommensurability".

The problem of the Toronto School’s theoretical identity emerges from the recognition that the most influential figures of this orientation do not agree regarding the general idea of the School as a coherent theoretical trend. Moreover, the idea of “medium” central to this orientation is fundamentally ambiguous. Therefore the aim of the paper is to consider the identity of the Toronto School by referring to the so called materialistic interpretation of the media. The paper supports the thesis that the minimal (...) definition of communication technologies in terms of physical artifacts comprises the conceptual core of the Toronto School’s identity. The failure to consider the minimalistic definition of media results in the general blurring of the Toronto School’s theoretical identity. (shrink)

Street festivals such as The Night of Culture (Noc Kultury) are aimed at fostering cultural participation. The growing popularity of such festivals raises the question, whether The Night of Culture creates an environment facilitating knowledge popularization. The paper explains that The Night of Culture creates an experience of engagement and immersion. The experience of immersion and engagement is grounded in blurring the clear distinction between representational objects and elements of so-called ordinary reality. Since the art installations at The Night of (...) Culture are often designed to be treated as an extension of the physical space in which the participant is located, from the participant’s perspective they lose the standard representational function. The paper explains that blurring the distinction between representation and reality impose serious limitation on treating the installations at The Night of Culture as the objects with a cognitive function. (shrink)

The study poses the question about the consequences of incommensurability for the problem of linguistic relativity. One can reasonably argue that if two languages are incommensurable, contradiction cannot exist between the judgments formulated inside them. Therefore it is possible to compile linguistic worldviews of two incommensurable languages into one coherent cognitive perspective. The latter view is called into question; hence the article examines the problem of relation between linguistically determined incommensurable worldviews. In order to analyze the issue there are distinguished (...) three dimensions of incommensurability: linguistic incommensurability, incommensurability of experience and ontological incommensurability. Conclusion excludes possibility of compilation of two ontologically incommensurable into one coherent cognitive perspective. (shrink)

Interview with Robert K. Logan by Marcin Trybulec.

The problem of the Toronto School’s theoretical identity emerges from the recognition that the most influential figures of this orientation do not agree regarding the general idea of the School as a coherent theoretical trend. Moreover, the idea of “medium” central to this orientation is fundamentally ambiguous. Therefore the aim of the paper is to consider the identity of the Toronto School by referring to the so called materialistic interpretation of the media. The paper supports the thesis that the minimal (...) definition of communication technologies in terms of physical artifacts comprises the conceptual core of the Toronto School’s identity. The failure to consider the minimalistic definition of media results in the general blurring of the Toronto School’s theoretical identity. (shrink)

The problem of the Toronto School’s theoretical identity emerges from the recognition that the most influential figures of this orientation do not agree regarding the general idea of the School as a coherent theoretical trend. Moreover, the idea of “medium” central to this orientation is fundamentally ambiguous. Therefore the aim of the paper is to consider the identity of the Toronto School by referring to the so called materialistic interpretation of the media. The paper supports the thesis that the minimal (...) definition of communication technologies in terms of physical artifacts comprises the conceptual core of the Toronto School’s identity. The failure to consider the minimalistic definition of media results in the general blurring of the Toronto School’s theoretical identity. (shrink)

U radu se nastoji prikazati kako se vjera i teologija mogu iskoristiti za testiranje uspješnosti velikih jezičnih modela (LLM–ova) i automatiziranih programa za čavrljanje (chatbotova) pogonjenima na takvim modelima, mjerenjem njihovih filozofskih vještina. Predstavljaju se rezultati testiranja četiriju odabranih chatbotova: ChatGPT, Bing, Bard i Llama2. Za potrebe testiranja uzeta su tri moguća izvora iz područja vjere i teologije: 1) teorija četiri smisla Svetog pisma, 2) apstraktne teološke izjave, 3) apstraktna logička formula izvedena iz vjerskog teksta kako bi se pokazalo da (...) su ovi izvori korisni u zadacima koji učinkovito mjere filozofske vještine kao što su npr. interpretacija danog isječka, kreativna dedukcija te prepoznavanje ontoloških ograničenja. Ovakav pristup omogućuje ispitivanje osjetljivosti kojom se otkrivaju razlike u uspješnosti četiriju chatbotova. Također je dan primjer kako odrediti referentne vrijednosti za ocjenu i usporedbu vještina, koristeći kriterije za procjenu te pojednostavljene skale za ocjenjivanje svakog korištenog chatbota u pogledu ispunjenja pojedinog kriterija. (shrink)

In this paper, I argue that computationalism is a progressive research tradition. Its metaphysical assumptions are that nervous systems are computational, and that information processing is necessary for cognition to occur. First, the primary reasons why information processing should explain cognition are reviewed. Then I argue that early formulations of these reasons are outdated. However, by relying on the mechanistic account of physical computation, they can be recast in a compelling way. Next, I contrast two computational models of working memory (...) to show how modeling has progressed over the years. The methodological assumptions of new modeling work are best understood in the mechanistic framework, which is evidenced by the way in which models are empirically validated. Moreover, the methodological and theoretical progress in computational neuroscience vindicates the new mechanistic approach to explanation, which, at the same time, justifies the best practices of computational modeling. Overall, computational modeling is deservedly successful in cognitive science. Its successes are related to deep conceptual connections between cognition and computation. Computationalism is not only here to stay, it becomes stronger every year. (shrink)

In this article, after presenting the basic idea of causal accounts of implementation and the problems they are supposed to solve, I sketch the model of computation preferred by Chalmers and argue that it is too limited to do full justice to computational theories in cognitive science. I also argue that it does not suffice to replace Chalmers’ favorite model with a better abstract model of computation; it is necessary to acknowledge the causal structure of physical computers that is not (...) accommodated by the models used in computability theory. Additionally, an alternative mechanistic proposal is outlined. (shrink)

The paper gives a survey of known results related to computational devices (finite and push–down automata) recognizing monadic generalized quantifiers in finite models. Some of these results are simple reinterpretations of descriptive—feasible correspondence theorems from finite–model theory. Additionally a new result characterizing monadic quantifiers recognized by push down automata is proven.

We compared the processing of natural language quantifiers in a group of patients with schizophrenia and a healthy control group. In both groups, the difficulty of the quantifiers was consistent with computational predictions, and patients with schizophrenia took more time to solve the problems. However, they were significantly less accurate only with proportional quantifiers, like more than half. This can be explained by noting that, according to the complexity perspective, only proportional quantifiers require working memory engagement.

The topic of the paper is to be the problem of normativity within naturalised epistemology. I pose a question whether naturalism can be conducted as a normative enterprise or whether it is merely descriptive as traditional epistemologists and some naturalists maintain. The article consists of two parts. The first one is an introduction to the main theses of naturalised epistemology, and the second one presents and disputes arguments against naturalised epistemology introduced in Jonathan Knowles’ book Norms, Naturalism and Normativity. In (...) the first part of the paper I indicate main differences between traditional and naturalised epistemology, especially I analyse their answers to the most important epistemological questions: What is the source of epistemic norms? When are beliefs valuable and how to gain such beliefs? What are criteria of justified belief and knowledge? The reason of differences in solutions of these problems is rotted in a different attitude to the naturalistic fallacy taken by the two sides of the discussion. Naturalists treat this fallacy as something that cannot be avoided and this approach deeply influences their account of normativity. To justify this thesis I firstly recall the traditional meaning of “normativity” on the bases of Descartes’ epistemology, post-Cartesian internalists’ and neopositivits’ works. Secondly, I present how and why the meanings of “epistemic norm” and “justified belief” have changed within naturalism. In this part I refer to Quine’s and Goldman’s naturalism. The second part of the paper discuses Knowles’ argument that the task of delivering genuine epistemic norms by naturalism is misguided and unreachable, for norms which naturalists refer to are reducible to descriptive statements. Naturalism, therefore, cannot be normative and consequently it cannot be an epistemology. I do not agree with this statement and in the last part of the paper I present how naturalised epistemic norms could be understood as different from descriptive statements, what functions they could perform and why naturalised epistemology is not redundant. (shrink)

The aim of this paper is to propose foundations for a formal model of representation and numerical evaluation of a possibly broad class of arguments, including those that occur in natural discourse. Since one of the most characteristic features of everyday argumentation is the occurrence of convergent reasoning, special attention should be paid to the operation ⊕, which allows us to calculate the logical force of convergent arguments with an accuracy not offered by other approaches.

The concept of an extended cognitive system is central to contemporary studies of cognition. In the paper I analyze the place of the epistemic subject within the extended cognitive system. Is it extended as well? In answering this question I focus on the differences between the first and the second wave of arguments for the extended mind thesis. I argue that the position of Cognitive Integration represented by Richard Menary is much more intuitive and fruitful in analyses of cognition and (...) knowledge than the early argument formulated by Andy Clark and David Chalmers. Cognitive Integration is compatible with virtue epistemology of John Greco’s agent reliabilism. The epistemic subject is constituted by its cognitive character composed of an integrated set of cognitive abilities and processes. Some of these processes are extended, they are a manipulation of external informational structures and, as such, they constitute epistemic practices. Epistemic practices are normative; to conduct them correctly the epistemic subject needs to obey epistemic norms embedded in the cultural context. The epistemic subject is not extended because of the casual coupling with external informational artifacts which extend his mind from inside the head and into the world. Rather, cognitive practices constitute the subject’s mind, they transform his cognitive abilities, and this is what makes the mind and epistemic subject “extended”. (shrink)

I argue that the Stoic logic is explosive. The claim applies to the Stoics' syllogistic in the strictest sense, because there is a provable syllogism which qualifies as a principle of explosion. It applies also to the general consequence operation, in the sense that every sentence is derivable from any pair containing both a sentence and the negation of the sentence. Finally, it applies to the connective of implication (conditional), in the sense that any conditional is derivable, providing its antecedent (...) is a conjunction of a sentence and the negation of the sentence. All three claims allow weakening, i.e., additions of extra premises to an inference or extra conjuncts to the antecedent of an implication, respectively. Consequently, no concept of relevance, let alone paraconsistency or connexivity is applicable to the Stoic logic; in particular, the Stoics' connective of implication is either material (Boolean) or formal (strict). (shrink)

Protein post‐translational modifications (PTMs) play a crucial role in all cellular functions by regulating protein activity, interactions and half‐life. Despite the enormous diversity of modifications, various PTM systems show parallels in their chemical and catalytic underpinnings. Here, focussing on modifications that involve the addition of new elements to amino‐acid sidechains, I describe historical milestones and fundamental concepts that support the current understanding of PTMs. The historical survey covers selected key research programmes, including the study of protein phosphorylation as a regulatory (...) switch, protein ubiquitylation as a degradation signal and histone modifications as a functional code. The contribution of crucial techniques for studying PTMs is also discussed. The central part of the essay explores shared chemical principles and catalytic strategies observed across diverse PTM systems, together with mechanisms of substrate selection, the reversibility of PTMs by erasers and the recognition of PTMs by reader domains. Similarities in the basic chemical mechanism are highlighted and their implications are discussed. The final part is dedicated to the evolutionary trajectories of PTM systems, beginning with their possible emergence in the context of rivalry in the prokaryotic world. Together, the essay provides a unified perspective on the diverse world of major protein modifications. (shrink)

Our new journal Philosophies is devoted to the search for a synthesis of philosophical and scientific inquiry. It promotes philosophical work derived from the experience of diverse scientific disciplines. [...].

The twentieth-century logical mainstream, derived from works by Łukasiewicz and Scholz, pictures the history of logic for the most part as the prehistory of Boolean–Fregean mathematical logic. Particularly, with respect to classical propositional calculus, the Stoic logic has been pictured as an early stage of it and Aristotle's or the Peripatetics' logic as a theory that assumes it. Although it was not emphasised, it follows that the ancient logics contain the principle of explosion. In the endmost quarter of the twentieth (...) century, a competitive view began to spread to the effect that the ancient systems of logic were paraconsistent or relevantistic. In the twenty-first century, the latter view prevails and has every chance of becoming a new orthodoxy. It is claimed that although in Łukasiewicz's argument for the classicality of ancient logics, there are gaps, it may be demonstrated that the ancient logics contain the principle of explosion. (shrink)

Dialectical fallacies are typically defined as breaches of the rules of a regulated discussion between two participants. What if discussions become more complex and involve multiple parties with distinct positions to argue for? Are there distinct argumentation norms of polylogues? If so, can their violations be conceptualized as polylogical fallacies? I will argue for such an approach and analyze two candidates for argumentative breaches of multi-party rationality: false dilemma and collateral straw man.

Cognitive science is an interdisciplinary conglomerate of various research fields and disciplines, which increases the risk of fragmentation of cognitive theories. However, while most previous work has focused on theoretical integration, some kinds of integration may turn out to be monstrous, or result in superficially lumped and unrelated bodies of knowledge. In this paper, I distinguish theoretical integration from theoretical unification, and propose some analyses of theoretical unification dimensions. Moreover, two research strategies that are supposed to lead to unification are (...) analyzed in terms of the mechanistic account of explanation. Finally, I argue that theoretical unification is not an absolute requirement from the mechanistic perspective, and that strategies aiming at unification may be premature in fields where there are multiple conflicting explanatory models. (shrink)

There are at least two reasons for the wide spread of CAI: 1. that the student is able to control his own process of learning due to immediate evaluation of his work and progress and 2. that evaluation is homogeneous, i.e. independent of subjective fac- tors, which compensates for possible lack of depth. Also, the psychology of man is such that he is less ashamed to be reprimanded for his errors by a machine than by another human being. It is (...) a specic feature of computer aided instruction of logic, particulary the art of proving, that such a system cannot be made other than open. Fortunately, in the case of logic its language makes such a creation possible. An open system is a system that permits arbitrary proof of theorems as long as the former conform to the requirement of a given formal language. The discussed system, Mizar-MSE, evolved, roughly speaking, the above line of thought. It is a natural deduction system practically applied to student instruction. Here I would like to present some of more specic features. (shrink)

The paper undertakes the problem of normativity within naturalized epistemology. The following issue is analyzed: can naturalism be developed as a normative enterprise, and if it can, what conditions it must satisfy to achieve a status of epistemology? According to “the standard condition”, in order to give a substantial account of normativity naturalism must present a theory of epistemic norms which are derived from descriptive statements about facts but which are not reduced to them. The thesis is that although naturalism (...) cannot present the conception of genuine epistemic norms which satisfy “the standard condition” it is still normative. Namely, within naturalism epistemic norms are descriptive statements about empirical phenomena which are expressed in normative form for the sake of everyday life and scientific practice. (shrink)

The discussion around dignity in nursing philosophy has been underway for many years. The literature still lacks philosophical arguments that would justify the thesis that all people have dignity. Scholars who defend dignity as an intrinsic value most often refer to Kant. However, Kant does not seem to be the most suitable candidate to defend the thesis that all human beings possess dignity. In this paper, I attempt to show that Aristotle's and Aquinas's views can help justify this thesis. To (...) this end, I distinguish between actual dignity, potential dignity, and existential dignity. I state that all human beings have existential dignity or potential dignity. (shrink)

In this paper, we closely examine the various ways in which a multi-party argumentative discussion—argumentative polylogue—can be analyzed in a dialectical framework. Our chief concern is that while multi-party and multi-position discussions are characteristic of a large class of argumentative activities, dialectical approaches would analyze and evaluate them in terms of dyadic exchanges between two parties: pro and con. Using as an example an academic committee arguing about the researcher of the year as well as other cases from argumentation literature, (...) we scrutinize the advantages and pitfalls of applying a dialectical framework to polylogue analysis and evaluation. We recognize two basic dialectical methods: interpreting polylogues as exchanges between two main camps and splitting polylogues into a multitude of dual encounters. On the basis of this critical inquiry, we lay out an argument expressing the need for an improved polylogical model and propose its basic elements. (shrink)

In the book, I argue that the mind can be explained computationally because it is itself computational—whether it engages in mental arithmetic, parses natural language, or processes the auditory signals that allow us to experience music. All these capacities arise from complex information-processing operations of the mind. By analyzing the state of the art in cognitive science, I develop an account of computational explanation used to explain the capacities in question.

Despite the continuous emphasis on globalization, we witness increasing divisions and divisiveness in all domains of human activities. One of the reasons, if not the main one, is the intellectual fragmentation of humanity, compared in the title to the failed attempt at building the Biblical Tower of Babel. The attempts to reintegrate worldview, fragmented by the specialization of education and expected to be achieved through reforms in curricula at all levels of education, were based on the assumption that the design (...) of a curriculum should focus on the wide distribution of subjects of study, as if the distribution was the goal. The key point is not the distribution of themes, but the development of skills in the integration of knowledge. The quantitative assessment of the width of knowledge by the number of disciplines is of secondary importance. We cannot expect the miracle that students without any intellectual tools developed for this purpose would perform the job of integration, which their teachers do not promote or demonstrate, and which they cannot achieve for themselves. There are many other reasons for the increasing interest in making inquiries interdisciplinary, but there is little progress in the methodology of the integration of knowledge. This paper is a study of the transition from multidisciplinarity to interdisciplinarity, and further, to transdisciplinarity, with some suggestions regarding the use of methodological tools of structuralism and the choice of a conceptual framework. (shrink)

In this paper, I focus on a problem related to teleological theories of content namely, which notion of function makes content causally relevant? It has been claimed that some functional accounts of content make it causally irrelevant, or epiphenomenal; in which case, such notions of function could no longer act as the pillar of naturalized semantics. By looking closer at biological questions about behavior, I argue that past discussion has been oriented towards an ill-posed question. What I defend is a (...) Very Boring Hypothesis: depending on the representational phenomenon and the explanatory question, different aspects might be important, and it is difficult to say a priori which ones these might be. There are multiple facets to biological functionality and causality relevant for explaining representational phenomena, and ignoring them will lead to unmotivated simplifications. In addition, accounting for different facets of functionality helps dispense with intuition-based specifications of cognitive phenomena. (shrink)

In this paper, I want to deal with the triviality threat to computationalism. On one hand, the controversial and vague claim that cognition involves computation is still denied. On the other, contemporary physicists and philosophers alike claim that all physical processes are indeed computational or algorithmic. This claim would justify the computationalism claim by making it utterly trivial. I will show that even if these two claims were true, computationalism would not have to be trivial.

The article puts forward the following question: do we, although the late Neoplatonic antique tradition perceived both Plato and Aristotle as the theologists par excellence, have to do with a justified historical judgement or the two authors in question, while searching for a long and authoritative philosophical tradition to their reasoning, do not even hesitate to make a move towards mystification. In the process of analyzing the Plato's and Aristotle's writings it was found out that in case of Plato, we (...) are exposed to theology in terms of 'talking about gods'. Additionally, Plato himself formulated the term 'theology'. The philosopher still remains only on the level of the 'theology of poets' or, at most, 'political theology' but not 'philosophical theology'. In case of Aristotle, however, we can refer to 'philosophical theology' in the full meaning of the term. (shrink)

Résumé L’article presente les changements qui se sont manifestes dans la recherche polonaise, essentiellement en litterature et histoire des Lumieres, entre 1945 et 1990. L’accent est mis sur l’impact du contexte politique sur la recherche. Les annees 1945-1956 ont ete marquees par de fortes contraintes ideologiques car le regime communiste imposait aux chercheurs une vision simplifiee des Lumieres censee repondre aux besoins de ses plans. Apres l’epoque stalinienne, la pression ideologique et institutionnelle s’est progressivement reduite, ouvrant la voie a davantage (...) de liberte de recherche et d’interpretation des Lumieres. Si certains episodes historiques continuaient a faire l’objet de debats publics, la vision des Lumieres produite par les travaux s’effectuait desormais sans ingerence directe du pouvoir. (shrink)

We present how the theory of reasoning developed by Tadeusz Czeżowski, a Polish logician and a member of the Lvov-Warsaw School (LWS) can be applied to the mediaeval texts which interpret the Bible, which we collectively call as Biblical exegesis (BE). In the first part of the paper, we characterise Czeżowski's theory of reasoning with some modifications based on remarks of Kazimierz Ajdukiewicz. On these grounds, we discuss the nature of reasoning and its different types, as well as the problem (...) of textual representation of reasoning. In the second part, we describe the analytical nature of some BE at the end of twelfth century and in the thirteenth century by referring to the examples of Stephen Langton, Robert Grosseteste, Bonaventure, Albert the Great and Thomas Aquinas. We argue that they represented an analytical approach in BE, characterised by advanced use of logic and specific methods, including reasoning reconstruction and logical analysis. In the third part, we present selected examples to show how Czeżowski's framework helps in identifying various types of reasoning. We indicate some universal problems with the textual representation of reasoning found in the BE of the authors in question. Lastly, we point out how Czeżowski's framework enables the understanding of phenomena such as ‘Special Biblical Inference’. Thanks to this experiment, we can see how a framework as advanced as that offered by LWS representatives can be put to the test using mediaeval Biblical commentaries, yielding interesting results. (shrink)

In the paper, I distinguish the bottom-up strategy and the intentional stance strategy of analyzing group intentional states, and show that the thesis of distributed group subject of knowledge could be accommodated by either of them. Moreover, I argue that when combined with virtue reliabilism the thesis satisfactorily explains the phenomenon of group knowledge. To justify my argument, in the second part of the paper, I distinguish two accounts of justification pointing to conditions of group knowledge. The first, which I (...) call the belief-centered approach to group intentional states, determines the concept of group belief and group justificatory reason. The second, the process-centered approach represented by S. Orestis Palermos, employs the theory of virtue reliabilism and focuses on the group knowledge-conducive process. In the paper, I argue in favor of the latter as the internalism associated with the former appears to lack sufficient explanatory power. The theory of virtue epistemology runs into considerable difficulties when trying to deal with an extended epistemic subject composed of one individual and her cognitive artifact. In the two last parts of the paper, I consider the most important difficulties and argue that these obstacles are overcome once one adopts an approach combining virtue epistemology and the thesis of distributed group epistemic subject. (shrink)

In this paper, an account of theoretical integration in cognitive (neuro)science from the mechanistic perspective is defended. It is argued that mechanistic patterns of integration can be better understood in terms of constraints on representations of mechanisms, not just on the space of possible mechanisms, as previous accounts of integration had it. This way, integration can be analyzed in more detail with the help of constraintsatisfaction account of coherence between scientific representations. In particular, the account has resources to talk of (...) idealizations and research heuristics employed by researchers to combine separate results and theoretical frameworks. The account is subsequently applied to an example of successful integration in the research on hippocampus and memory, and to a failure of integration in the research on mirror neurons as purportedly explanatory of sexual orientation. (shrink)

The article covers Erwin W. Straus’ views on the problem of time and temporal experience in the context of psychopathology. Beside Straus’ published scholarship, including his papers dealing exclusively with the subject of time, the sources utilized in this essay comprise several of Straus’ unpublished manuscripts on temporality, with the primary focus on the 1952 manuscript Temporal Horizons, which is discussed in greater detail and subsequently published for the first time in this journal. In the first part of the article, (...) the author introduces what he considers to be the central tension of the whole of Straus’ work on the issue of time, namely, the tension stemming from a dualistic account of time with its personal and impersonal dimensions. Interpretative developments of this tension are followed covering Straus’ early German works and his late American scholarship. The author presents Straus’ way of overcoming the dualistic account of time and his arguments in favour of what is termed here the “unified view of time”. Of critical importance for the unified view is Straus’ concept of “today”, which is extensively commented upon. In the second part of the article, the author focuses on the psychopathological consequences of the unified view as seen by Straus. A clear-cut boundary between a normal and a psychotic experience of time is supposed to lie in breaking the bond between the personal and the impersonal orders of time, leading to a fundamental estrangement. This view, it is claimed, is already present in a nutshell in Straus’ earliest work, and is elaborated upon later. In conclusion, both the merits and the weaknesses of Straus’ account of temporality are presented. A major advantage is that Straus abstains from a dualistic conception of time and reappraises the often-devalued clock time. A fundamental drawback is that Straus does not venture to explore the pathological varieties of temporal experience and fails to specify the acknowledged differences between, on the one hand, psychotic elements in depressive disorders, and, on the other hand, such elements in schizophrenic disturbances. (shrink)