When observers view a rapidly moving stimulus they may see only a static streak. We report that there can be a transient percept of motion if such a moving stimulus is preceded or followed by a stationary image of that stimulus. A ring of dots was rotated so rapidly observers only saw a continuous outline circle and could not report its rotation direction. When an objectively stationary ring of dots preceded or followed this rotating ring, the stationary ring appeared to (...) visibly launch into motion from a standstill or visibly rotate to a halt, principally in the same direction as the actual rapid rotation. Thus, motions too rapid to be consciously perceived as motion can nonetheless be processed by the visual system, and generate neural transition states that are consciously experienced as motion percepts. We suggest such transition states might serve a unifying function by bridging discontinuous motion states. (shrink)

In vision research metacontrast masking is a widely used technique to reduce the visibility of a stimulus. Typically, studies attempt to reveal general principles that apply to a large majority of participants and tend to omit possible individual differences. The neural plasticity of the visual system, however, entails the potential capability for individual differences in the way observers perform perceptual tasks. We report a case of perceptual learning in a metacontrast masking task that leads to the enhancement of two types (...) of adult human observers despite identical learning conditions. In a priming task both types of observers exhibited the same priming effects, which were insensitive to learning. Findings suggest that visual processing of target stimuli in the metacontrast masking task is based on neural levels with sufficient plasticity to enable the development of two types of observers, which do not contribute to processing of target stimuli in the priming task. (shrink)

Unconscious stimuli can influence participants’ motor behavior but also more complex mental processes. Recent research has gradually extended the limits of effects of unconscious stimuli. One field of research where such limits have been proposed is spatial cueing, where exogenous automatic shifts of attention have been distinguished from endogenous controlled processes which govern voluntary shifts of attention. Previous evidence suggests unconscious effects on mechanisms of exogenous shifts of attention. Here, we applied a cue-priming paradigm to a spatial cueing task with (...) arbitrary cues by centrally presenting a masked symmetrical prime before every cue stimulus. We found priming effects on response times in target discrimination tasks with the typical dynamic of cue-priming effects indicating that central symmetrical stimuli which have been associated with endogenous orienting can modulate shifts of spatial attention even when they are masked. Prime–Cue Congruency effects of perceptual dissimilar prime and cue stimuli suggest that these effects cannot be entirely reduced to perceptual repetition priming of cue processing. In addition, priming effects did not differ between participants with good and poor prime recognition performance consistent with the view that unconscious stimulus features have access to processes of endogenous shifts of attention. (shrink)

In metacontrast masking target visibility is modulated by the time until a masking stimulus appears. The effect of this temporal delay differs across participants in such a way that individual human observers’ performance shows distinguishable types of masking functions which remain largely unchanged for months. Here we examined whether individual differences in masking functions depend on different response criteria in addition to differences in discrimination sensitivity. To this end we reanalyzed previously published data and conducted a new experiment for further (...) data analyses. Our analyses demonstrate that a distinction of masking functions based on the type of masking stimulus is superior to a distinction based on the target–mask congruency. Individually different masking functions are based on individual differences in discrimination sensitivities and in response criteria. Results suggest that individual differences in metacontrast masking result from individually different criterion contents. (shrink)

In this issue of Consciousness and Cognition, Bachmann comments on our study , which revealed two groups of observers with qualitative individual differences in metacontrast masking that are enhanced by perceptual learning. We are pleased that our study receives this attention and even more about Bachmann’s extremely positive comments. In this invited reply we argue that observers seem to be similar only at the beginning of the experiment but they have no choice as to which group to join. Findings strongly (...) recommend to look at the data of individual subjects. (shrink)

Unconscious stimuli can influence participants’ motor behavior as well as more complex mental processes. Previous cue-priming experiments demonstrated that masked cues can modulate endogenous shifts of spatial attention as measured by choice reaction time tasks. Here, we applied a signal detection task with masked luminance targets to determine the source and the scope of effects of masked stimuli. Target-detection performance was modulated by prime-cue congruency, indicating that prime-cue congruency modulates signal enhancement at early levels of target processing. These effects, however, (...) were only found when the prime was perceptually similar to the cue indicting that primes influence early target processing in an indirect way by facilitating cue processing. Together with previous research we conclude that masked stimuli can modulate perceptual and post-central levels of processing. Findings mark a new limit of the effects of unconscious stimuli which seem to have a smaller scope than conscious stimuli. (shrink)

Visual stimuli that are made invisible by masking can affect motor responses to a subsequent target stimulus. When a prime is followed by a mask which is followed by a target stimulus, an inverse priming effect has been found: Responses are slow and frequently incorrect when prime and target stimuli are congruent, but fast and accurate when prime and target stimuli are incongruent. To functionally localize the origins of inverse priming effects, we applied the psychological refractory period paradigm which distinguishes (...) a perceptual level, a central bottleneck, and a level of motor execution. Two dual-task experiments were run with the PRP-paradigm to localize the inverse priming effect relative to the central bottleneck. Together, results of the Effect-Absorption and the Effect-Propagation Procedure suggest that inverse priming effects are generated by perceptual mechanisms. We suggest two perceptual mechanisms as the source of inverse priming effects. (shrink)

Visual stimuli that are made invisible by a following mask can nonetheless affect motor responses. To localize the origin of these target priming effects we used the psychological refractory period paradigm. Participants classified tones as high or low, and responded to the position of a visual target that was preceded by a prime. The stimulus onset asynchrony between both tasks varied. In Experiment 1 the tone task was followed by the position task and SOA dependent target priming effects were observed. (...) When the visual position task preceded the tone task in Experiment 2, with short SOA the priming effect propagated entirely to the tone task yielding faster responses to tones on visually congruent trials and delayed responses to tones on visually incongruent trials. Together, results suggest that target priming effects arise from processing before and at the level of the central bottleneck such as sensory analysis and response selection. (shrink)

Apart from positive priming effects, masked prime stimuli can impair responses to a subsequent target stimulus which shares response-critical features in contrast to a target assigned to the opposite response. This counterintuitive phenomenon is called inverse priming . Here we examine the generality of this phenomenon beyond priming of motor responses. We used a non-motor cue-priming paradigm to study the underlying mechanism of inverse priming for relevant features masks which include task-relevant stimulus features and for irrelevant masks which omit task-relevant (...) features. We found inverse cue-priming effects with both types of masks. With task-irrelevant masks inverse cue-priming was emphasized in those participants being unable to perceive the prime. The existence of inverse non-motor priming under conditions where simple perceptual interactions between the stimuli are ruled out as the source of inverse priming is at odds with the view that inverse priming reflects motor inhibition. Alternatives are discussed. (shrink)

Wann ist ein Krieg gerecht? Wer ist "unschuldig", und wer ist unter welchen Umstanden ein legitimes Angriffsziel? Und was bedeutet das fur die Beurteilung von Terrorismus? Diese und andere hochaktuelle Fragen behandelt Uwe Steinhoff in seiner kritischen und provokativen Analyse auch im Ruckgriff auf aktuelle Beispiele wie den Nahostkonflikt und den "Krieg gegen den Terror". Der Leser erhalt einen profunden und prazisen Uberblick uber die philosophische Debatte als unentbehrliches Rustzeug fur die eigene Urteilsfindung. "In seiner gewahlten Rolle als philosophe provocateur (...) prasentiert Steinhoff eine nachhaltige Position und untermauert sie mit enthusiastischen Kritiken konventioneller Ansichten und dem unerschrockenen Ausbuchstabieren der Logik der Alternativen. Insbesondere fur Philosophiestudenten wird dieses Buch eine nutzliche Provokation sein, und vieles von dem, was gesagt wird, verdient Zustimmung." "Dieses kraftvoll herausfordernde Buch wird zweifelsohne Kontroversen provozieren und die Debatte stimulieren.". (shrink)

The Handbook of Computational Social Science is a comprehensive reference source for scholars across multiple disciplines. It outlines key debates in the field, showcasing novel statistical modeling and machine learning methods, and draws from specific case studies to demonstrate the opportunities and challenges in CSS approaches. The Handbook is divided into two volumes written by outstanding, internationally renowned scholars in the field. This first volume focuses on the scope of computational social science, ethics, and case studies. It covers a range (...) of key issues, including open science, formal modeling, and the social and behavioral sciences. This volume explores major debates, introduces digital trace data, reviews the changing survey landscape, and presents novel examples of computational social science research on sensing social interaction, social robots, bots, sentiment, manipulation, and extremism in social media. The volume not only makes major contributions to the consolidation of this growing research field, but also encourages growth into new directions. With its broad coverage of perspectives (theoretical, methodological, computational), international scope, and interdisciplinary approach, this important resource is integral reading for advanced undergraduates, postgraduates and researchers engaging with computational methods across the social sciences, as well as those within the scientific and engineering sectors. (shrink)

Anerkennung soll die Leerstelle ausfüllen, die mit dem Zusammenbruch metaphysischer Systeme aufgetreten ist. Die Ethik sozialer Anerkennung wird damit aber mit Erwartungen überfrachtet. Durch technologische Veränderungen verändern sich permanent die Statusbestimmungen: Die Autonomie des Menschen konkurriert mit künstlich-intelligenten Maschinen, die Leidensfähigkeit mit der des Tieres, die Individualität mit der digitalen Selbstinszenierung und die Geschöpflichkeit mit der technologischen Selbstvergöttlichung. Die Beiträge suchen nach Bedingungen sozialer Anerkennung, die nicht zirkulär ausgehandelt werden können, sondern Kategorien einbringen, die auch von Menschen verwendet werden, wenn (...) sie von Gott sprechen. Damit soll die Basis einer theologischen Anerkennungstheorie gelegt werden. (shrink)

This paper first summarizes two central debates in the field of social scientific Internet research, namely the debate about the so-called ‘social impact of Internet use’ and the debate about the existence of community on the Internet. Early research discussed whether building up a community on the Internet was possible and what the effects of the use of the Internet were for its user. Recent research on the social consequences of Internet use suggests that ‘the’ Internet should no longer be (...) regarded as a constant that has uniform effects for its users. Rather, the consequences of its use depend on a number of contextual conditions. The paper presents some theories that explain which conditions and features of online groups facilitate the finding of solutions to bilateral or group-level problems of cooperation. (shrink)

Many ethical frameworks require artificial intelligence (AI) systems to be explainable. Explainable AI (XAI) models are frequently tested for their adequacy in user studies. Since different people may have different explanatory needs, it is important that participant samples in user studies are large enough to represent the target population to enable generalizations. However, it is unclear to what extent XAI researchers reflect on and justify their sample sizes or avoid broad generalizations across people. We analyzed XAI user studies (N = (...) 220) published between 2012 and 2022. Most studies did not offer rationales for their sample sizes. Moreover, most papers generalized their conclusions beyond their target population, and there was no evidence that broader conclusions in quantitative studies were correlated with larger samples. These methodological problems can impede evaluations of whether XAI systems implement the explainability called for in ethical frameworks. We outline principles for more inclusive XAI user studies. (shrink)

Mit der neuzeitlichen Säkularisierung verliert auch der Protestantismus seinen Volkskirchencharakter. Das hat eine Neuorientierung zur Folge. An die Stelledes theistischen Gottesbildes tritt das Paradox vom 'abwesenden' Gott. Der Autor interpretiert das Glaubensparadox als Widerfahrnis von Befreiung und Verpflichtung durch den Anderen in der 'Spur' Gottes. Er diskutiert diese für die Zivilgesellschaft relevanten Potentiale mit Feministischer Theologie, mit der Umgestaltung des Erlösungschristentums in einen Protestantismus der Versöhnung mit unserer Endlichkeit und der Schöpfungswelt. Vom methodischen Gesichtspunkt wählt der Autor einen phänomenologisch-dekonstruktiven Ansatz (...) im Gespräch mit Bonhoeffer, Nancy, Levinas und mit der protestantischen Tradition. (shrink)

Im vorliegenden Buch wird versucht, im Rahmen der allgemeinen Pädagogik aus philosophisch-pädagogischer Perspektive in Anwendung der historisch-kritischen und hermeneutisch-verstehenden Methode die ursprünglichen Lehren des Konfuzius und des So krates aus dem Konfuzianismus und aus dem Sokratismus annähernd herauszuarbeiten, um sie im Hinblick auf den Zusammenhang von Fremderziehung und Selbsterziehung des Menschen im Sinne einer Entwicklung zu befragen. Aus den Untersuchungen ergibt sich, daß die jeweiligen Inbegriffe der Lehren des Konfuzius und des Sokrates, die des "Lernens" und des "Philosophierens", als Selbsterziehung (...) des einzelnen Menschen bezeichnet werden können und daß die Selbsterziehung des einzelnen Menschen in beiden Lehren seine authentische Fremderziehung zur Voraussetzung hat. Das jeweilige Ziel der Lehren des Konfuzius und des Sokrates im Hinblick auf die Selbsterziehung des einzelnen Menschen im Sinne der Weiterentwicklung seiner authentischen Fremderziehung bzw. im Sinne seines selbständigen und selbstkritischen Lebensweges ist die Menschlichkeit (ren) und die Trefflichkeit (Arete). Kennzeichen der bewußten Lebensform der Selbsterziehung des einzelnen Menschen ist in beiden Lehren die Erfahrung innerer Freiheit und innerer Zufriedenheit, die dem einzelnen Menschen durch seine Selbsterziehung zuteil wird. (shrink)

Studies have shown that in the mammalian neuromuscular system stretch reflexes are localized within individual muscles. Neuromuscular compartmentalization, the partitioning of sensory output from muscles, and the partitioning of segmental pathways to motor nuclei have also been demonstrated. This evidence indicates that individual motor nuclei and the muscles they innervate are not homogeneous functional units. An analysis of the functional significance of reflex localization and partitioning suggests that segmental control mechanisms are based on subdivisions of motor nuclei–muscle complexes. A partitioned (...) organization of segmental control mechanisms could utilize (1) the potential functional diversity of muscle fiber types, (2) the variety of mechanical actions of individual muscles arising from their distributed origins and insertions, and (3) diverse architectural features such as intramuscular variations in pinnation and complex in-series and in-parallel arrangements of muscle fibers. The differentiated activity observed in some muscles during natural movements also calls for localized segmental control mechanisms. Partitioning may also play a role in mechanical interactions between contracting motor units and in increasing the stability of neuromuscular systems. The functional advantages of reflex localization and partitioning suggest they are probably common features of segmental systems, whose organization reflects the structure and function of their associated neuromuscular systems. (shrink)

Confirmation bias is one of the most widely discussed epistemically problematic cognitions, challenging reliable belief formation and the correction of inaccurate views. Given its problematic nature, it remains unclear why the bias evolved and is still with us today. To offer an explanation, several philosophers and scientists have argued that the bias is in fact adaptive. I critically discuss three recent proposals of this kind before developing a novel alternative, what I call the ‘reality-matching account’. According to the account, confirmation (...) bias evolved because it helps us influence people and social structures so that they come to match our beliefs about them. This can result in significant developmental and epistemic benefits for us and other people, ensuring that over time we don’t become epistemically disconnected from social reality but can navigate it more easily. While that might not be the only evolved function of confirmation bias, it is an important one that has so far been neglected in the theorizing on the bias. (shrink)

Language- and music-readiness are demonstrated as related within comparative neuroprimatology by elaborating three hypotheses concerning music-readiness (MR): The (musicological) rhythm-first hypothesis (MR-1), the combinatoriality hypothesis (MR-2), and the socio-affect-cohesion hypothesis (MR-3). MR-1 states that rhythm precedes evolutionarily melody and tonality. MR-2 states that complex imitation and fractionation within the expanding spiral of the mirror system/complex imitation hypothesis (MS/CIH) lead to the combinatorial capacities of rhythm necessary for building up a musical lexicon and complex structures; and rhythm, in connection with repetition (...) and variation, scaffolds both musical form and content. MR-3 states that music’s main evolutionary function is to self-induce affective states in individuals to cope with distress; rhythm, in particular isochrony, provides a temporal framework to support movement synchronization, inducing shared affective states in group members, which in turn enhances group cohesion. This document reviews current behavioural and neurocognitive research relevant to the comparative neuroprimatology of music-readiness. It further proposes to extend MS/CIH through the evolution of the relationship of the language- and music-ready brain, by comparing “affective rhythm” and prosody – i.e. by comparatively approaching the language- and music-emotion link in neuroprimatology. (shrink)