Is a picture worth a thousand words? Evidence from concept definitions by patients with semantic dementia

Nine patients with semantic dementia (the temporal lobe variant of frontotemporal dementia) were asked to define concrete concepts either from presentation of a picture of the object or from its spoken name. As expected, the patients with the most severe semantic impairment produced the least detailed definitions, and the quality of the definitions overall was significantly related to concept familiarity. Further analyses of the definitions were designed to assess two key theoretical aspects of semantic organization. (i) Do objects and their corresponding names activate conceptual information in two neuroanatomically separable (modality-specific) semantic systems? If so, then-apart from any expected commonality in performance attributable to factors such as concept familiarity-one would not predict striking item-specific similarities in a patient's picture- and word-elicited definitions. (ii) Do sensory/perceptual features and more associative/functional attributes of conceptual knowledge form two neuroanatomically separable subsystems? If so, then one would predict significant dissociations in the prominence of these two types of information in the patients' definitions. The results lead us to favor a model of the semantic system that is divided by attribute type but not by modality.     

The Impact of Necessity and Sufficiency in The Wason Four-Card Selection Task

Performance in the Wason card selection task is often improved given thematic content. Such content effects have been considered evidence against human rationality. We propose that the role of content lies in specifying premises underlying "if P, then Q" rules. Unlike thematic rules, abstract conditional rules do not explicitly provide material interpretation (P is a sufficient but not necessarily a necessary condition for Q), resulting in nonnormative responses. When necessity–sufficiency relations were explicated, normative responses were elicited and effects of other logically irrelevant components disappeared. The results suggest that content effects are compatible with human rationality.     

What’s in a name? Lexical knowledge drives infants’ visual preferences in the absence of referential input

Seventeen-month-old infants were presented with pairs of images, in silence or with the non-directive auditory stimulus ‘look!’. The images had been chosen so that one image depicted an item whose name was known to the infant, and the other image depicted an image whose name was not known to the infant. Infants looked longer at images for which they had names than at images for which they did not have names, despite the absence of any referential input. The experiment controlled for the familiarity of the objects depicted: in each trial, image pairs presented to infants had previously been judged by caregivers to be of roughly equal familiarity. From a theoretical perspective, the results indicate that objects with names are of intrinsic interest to the infant. The possible causal direction for this linkage is discussed and it is concluded that the results are consistent with Whorfian linguistic determinism, although other construals are possible. From a methodological perspective, the results have implications for the use of preferential looking as an index of early word comprehension.     

Allegoria: Reading as a Spiritual Exercise

What I wish to argue for in this essay is the theological advantage of turning from the stasis of analogy and symbol (important categories for modernity according to Paul de Man) to the dynamism and semiosis of allegory. The move from static, atemporal discussions of analogy and symbol to allegory will lend itself to a rather different model for the hermeneutical task. It is one that is founded upon narrative, mimesis and participation, and one that presents a more dynamic view of the relationship between revelation (the event of Christ), disclosure (a participation in that event), representation and knowledge. I begin by examining a constellation of inter-related ideas—narrative, participation in an unfolding tradition, knowledge and discipleship—in what is often read as an appeal in the Lukan Preface to historical facts. I then return to Aristotle, to develop the rich association between mimesis and phronesis, rhetoric and knowledge, and to point out the ambiguous nature of analogy to ontology. The practice of living, for Aristotle, I suggest, is allegorical. It is with Gregory of Nyssa's work on allegory that I put together the Lukan emphasis upon participation and discipleship with an account of reading creation allegorically. With Gregory, we learn how to read the world in the light of its Christic watermark and in the power of a Trinitarian desire. In modernity such allegorical reading fell out of favour, and it is a recapitulation of that theologically informed, allegorical reading (rearticulated with the help of the new turn to allegory by poststructuralist thinkers) that this essay finally exhorts.