Purpose: Of the three currently recognized variants of primary progressive aphasia, behavioral differentiation between the nonfluent/agrammatic (nfvPPA) and logopenic (lvPPA) variants is particularly difficult. The challenge includes uncertainty regarding diagnosis of apraxia of speech, which is subsumed within criteria for variant classification.…

Thirty hearing impaired students (11-14 years old) participated in a study to measure classification principles using demonstration or display of labels containing relevant words or iconic signs. Three methods of teaching classificatory principles were employed: demonstration, verbal labels, or iconic labels. Analysis of mistakes made by Ss…

A theory for representation of concepts in memory is proposed which emphasizes the association of salient exemplars with the concept. Previous theories dealing with the classification processes involved in acquiring new concepts have shown that clear category boundaries do not exist. It is proposed that present theory must account for the…

In three experiments, adults and 30-month-old children (1) selected a novel object as the referent for a novel term; (2) extended the new word to another exemplar; and (3) allowed the new word to preempt another novel label from applying to the just-named object. (BC)

Presents results of a test of nonmusic majors' ability to remember song titles. Suggests that, although the process of categorization seems to be a basic function of perception, appropriate categorization needs to be learned. Supports the view that music learning, like verbal learning, involves a categorization of stimuli based on holistic…

Analyzes attributes of symbols and identifies the need for a suitable management system for retrieving images from a database. A classification structure that incorporates graphic, semantic, and bibliographic dimensions is described; experiments with describing, sorting, and drawing symbols are reviewed; and future work on a database management…

Two experiments explored the differential effects of two kinds of organization (taxonomic and schematic) on retrieval of information. (Author/PN)

When taught to link sorting to self-instruction ("I'm looking for blue triangles") children show perfect accuracy in sorting. This study investigated if this performance would generalize to new stimuli. One participant showed near-perfect generalization to all new stimulus sets (shapes, letters, pictures); two had difficulty with…

Forced-choice items, investigating the performance of 80 undergraduates on verbal classification and verbal analogy, were sequentially presented, allowing independent estimates of the accuracy of four principle component processes: inference, application, recognition, and distraction. Within-task performance showed substantial individual variation…

Sixteen sixth and seventh grade students with language disorders were taught 20 vocabulary items by means of categorization and verbal rehearsal, with half of the students encouraged to use a visual imagery learning strategy. Results suggest that visual imagery may enhance verbal encoding strategies. (Author/DB)

Background: The relationship between the age of reaching infant developmental milestones and later intellectual function within the normal population remains unresolved. We hypothesised that the age of learning to stand in infancy would be associated with adult executive function and that the association would be apparent throughout the range of…