Exploiting the skills of others enables individuals to reduce the risks and costs of resource innovation. Social corvids are known to possess sophisticated social and physical cognitive abilities. However, their capacity for imitative learning and its inter-individual transmission pattern remains mostly unexamined. Here we demonstrate the large-billed crows' ability to learn problem-solving techniques by observation and the dominance-dependent pattern in which this technique is transmitted. Crows were allowed to observe one of two box-opening behaviours performed by a dominant or subordinate (...) demonstrator and then tested regarding action and technique. The observers successfully opened the box on their first attempts by using non-matching actions but matching techniques to those observed, suggesting emulation. In the subsequent test sessions, dominant observers (i.e. those dominant to the bird acting as demonstrator) consistently used the learned technique, whereas subordinates (i.e. those subordinate to the bird acting as demonstrator) learned alternative techniques by explorative trial and error. Our findings demonstrate crows' capacity to learn by observing behaviours and the effect of dominance on transmission patterns of behavioural skills. Keywords: social learning; imitation; emulation; affordance; culture; innovation. (shrink)
In his Pramāṇaviniścaya 3, Dharmakīrti criticizes the view of the Sāṅkhyas that the word anityatva (“impermanence”) means a process of transformation ( pariṇāma ) of primordial matter ( pradhāna ). In this connection, he deals with the following two explanations of transformation: (1) the disappearance ( tirodhāna ) of the previous dharma of an entity ( dharmin/dravya ) and (2) the cessation ( nivṛtti ) of the previous state ( avasthā ) of an entity ( avasthātṛ ). In response to (...) these explanations, he proves that whenever a transformation takes place, the previous entity is destroyed, and therefore, impermanence does not mean transformation, but only destruction ( vināśa ). His criticism is basically along the same lines as Vasubandhu’s arguments found in the Abhidharmakośabhāṣya . However, because of developments in the theory of transformation, Vasubandhu’s criticism allows room for a retort from the Sāṅkhya. For this reason, Dharmakīrti augments Vasubandhu’s theory in order to make it sustainable against the more developed Sāṅkhya theory. (shrink)
I have first translated Sein und Zeit in Japanese in 1971 in collaboration with my elder colleague Prof. Hara in Tokyo. But in 1976 both he and Martin Heidegger died, and in 1977 a new edition of Sein und Zeit was published as part of Heidegger’s complete works. This new edition included many marginal notes of Heidegger’s and many textual revisions made by Heidegger himself. Therefore, I have published in 2003, based on the old version of my Japanese translation, a (...) totally revised Japanese translation of Sein und Zeit, in which, as translator, I have written a new introduction, many explicatory notes about Heidegger’s marginal notes and textual modifications and a chronological detailed record of Heidegger’s career. Out of this experience, I would like to detail upon two aspects: first, any nowadays reader of this work must study not only the original text itself, but also, by all means, Heidegger’s marginal notes, in order to correctly grasp a development of his thought on Being. Secondary, a reader must especially pay attention to the difficult problem of the relationship between authenticity and inauthenticity of the Being-in-the-world, because here is the most basic problem of the existence of Dasein and it is here the place where the turning point in Heidegger’s later thought on Being has its origin. (shrink)
This article considers Socrates's conception of courage in Plato's Socratic dialogues. Although the Laches, which is the only dialogue devoted in toto to a pursuit of the definition of courage, does not explicitly provide Socrates's definition of courage, I shall point out clues therein which contribute to an understanding of Socrates's conception of courage. The Protagoras is a peculiar dialogue in which Socrates himself offers a definition of courage. Attending to the dramatic structure and personalities of the dialogue, I will (...) point out that Socrates does not commit to the definition and that the hedonism and the definition of courage are used to disclose Protagoras's confusion regarding virtue. Following one of the clues within the Laches I will turn to the Apology and indicate Socrates's conception of courage which is based on his awareness of lack of knowledge of death and his religious conviction that nothing will happen for the good in life or in death. Finally I will show that such conception of Socratic courage satisfies the criteria in the Laches. (shrink)
All the attempts to find the justification of the privileged evolution of phenomena exclusively in the external world need to refer to the inescapable fact that we are living in such an asymmetric universe. This leads us to look for the origin of the “arrow of time” in the relationship between the subject and the world. The anthropic argument shows that the arrow of time is the condition of the possibility of emergence and maintenance of life in the universe. Moreover, (...) according to Bohr’s, Poincaré’s and Watanabe’s analysis, this agreement between the earlier-later direction of entropy increase and the past-future direction of life is the very condition of the possibility for meaningful action, representation and creation. Beyond this relationship of logical necessity between the meaning process and the arrow of time the question of their possible physical connection is explored. To answer affirmatively to this question, the meaning process is modelled as an evolving tree-like structure, called “Semantic Time”, where thermodynamic irreversibility can be shown. (shrink)
We are accustomed to thinking that a primrose is "concrete" and a prime number is "abstract," that "roundness" is more abstract than "round," and that "property" is more abstract than "roundness." In reality, the relation between "abstract" and "concrete" is more like the (non)relation between "abstract" and "concave," "concrete" being a sensory term [about what something feels like] and "abstract" being a functional term (about what the sensorimotor system is doing with its input in order to produce its output): Feelings (...) and things are correlated, but otherwise incommensurable. Everything that any sensorimotor system such as ourselves manages to categorize successfully is based on abstracting sensorimotor "affordances" (invariant features). The rest is merely a question of what inputs we can and do categorize, and what we must abstract from the particulars of each sensorimotor interaction in order to be able to categorize them correctly. To categorize, in other words, is to abstract. And not to categorize is merely to experience. Borges's Funes the Memorious, with his infinite, infallible rote memory, is a fictional hint at what it would be like not to be able to categorize, not to be able to selectively forget and ignore most of our input by abstracting only its reliably recurrent invariants. But a sensorimotor system like Funes would not really be viable, for if something along those lines did exist, it could not categorize recurrent objects, events or states, hence it could have no language, private or public, and could at most only feel, not function adaptively (hence survive). Luria's "S" in "The Mind of a Mnemonist" is a real-life approximation whose difficulties in conceptualizing were directly proportional to his difficulties in selectively forgetting and ignoring. Watanabe's "Ugly Duckling Theorem" shows how, if we did not selectively weight some properties more heavily than others, everything would be equally (and infinitely and indifferently) similar to everything else. Miller's "Magical Number Seven Plus or Minus Two" shows that there are (and must be) limitations on our capacity to process and remember information, both in our capacity to discriminate relatively (detect sameness/difference, degree-of-similarity) and in our capacity to discriminate absolutely (identify, categorize, name), The phenomenon of categorical perception shows how selective feature-detection puts a Whorfian "warp" on our feelings of similarity in the service of categorization, compressing within-category similarities and expanding between-category differences by abstracting and selectively filtering inputs through their invariant features, thereby allowing us to sort and name things reliably. Language does allow us to acquire categories indirectly through symbolic description.... (shrink)
Though there has been an array of methods to evaluate the extent of sarcoidosis, it is generally difficult to detect central nervous system involvement. Recently it has become accepted that 18F-FDG PET is more sensitive than gallium scintigraphy in finding sarcoid lesions, however its usefulness and limitations for detecting sarcoidosis in the central nervous system, especially in the spinal cord, has rarely been investigated. Two patients with pathologically confirmed sarcoidosis manifested spinal symptoms. We conducted 18F-FDG PET along with conventional imagings (...) before and after treatment. Abnormal FDG uptakes which could not be detected by gallium scintigraphy were shown in the spinal cords in both patients. These abnormal uptakes were diminished in accordance with clinical improvement after treatment. Our findings suggest that 18F-FDG PET is effective in detecting and tracking the activity of spinal sarcoidosis. (shrink)
In his inspiring dissertation "Quantification in the Theory of Grammar", Nishigauchi has argued that Japanese interrogatives can only be adequately analysed if we assume pied-piping for wh-phrases in logical form (henceforth called LF Pied-Piping). The idea has since become fashionable. Among others, Hasegawa (1986), Choe (1987), Bayer (1990), and Watanabe (1992) assume LF Pied-Piping. In this paper I will argue that there is no pied-piping at the level of "transparent LF", by which term I understand that level of (...) representation which determines the interpretation (modulo context-dependency). An adequate LF requires either unbounded LF movement or reconstruction of the pied-piped material or an equivalent method. It is not possible to interpret the pied-piped material in SpecC.1 The organization of the representation is as follows. (shrink)
A demanding introduction to logic and critical thinking, this book offers more traditional means of teaching the art of reasoning at a time when the field has become almost mathematical. Francis Dauer has rethought the framework for teaching reasoning in general and formal logic in particular, the desired epistemological context, and the role of the fallacies. The result is a coherent and very readable work, informed by Dauer's extensive experience teaching and writing on the subject.
