Retention of acoustic, phonological, and semantic information in a person with conduction aphasia: implications for language-based models of short-term memory

This is the authors' abstract. We don't add key points for this paper.

Background Cognitive models of verbal short-term memory differ considerably with one popular model assuming independent short-term buffers, including the phonological loop, and others conceiving of short-term memory as activated long-term memory. Data from individuals with neuropsychological impairments, particularly phonemic deficits in the context of aphasia, are an important source of evidence to evaluate these different cognitive models.Aims The study used experimental results from an individual with conduction aphasia to evaluate cognitive models of short-term memory. Immediate serial recall tasks involved acoustic, phonological, lexical, and semantic information to varying degrees.Methods The experimental tasks involved oral recall of series of long and short tones, series of digits or words, series of the digits “1” and “0”, as well as the semantic categories of words (animals versus digits) in the correct order. Thirteen age-matched neurotypical control participants provided normative data with which the participant’s results were compared.Outcome The participant was impaired in the serial recall of lists of digits and lists of words. He was, however, unimpaired recalling series of long and short tones, series of “0” and “1”, as well as the semantic categories of words presented in lists. This is incompatible with the phonological loop model which does not distinguish between different verbal information and the varying degrees of phonological and semantic information. In addition, it is argued that within the larger family of psycholinguistic models of verbal short-term memory, one model accounts for the results better than others.