Abstract
Issues concerning repetition, especially input processing and echoic memory, which is crucial for short-term verbal retention, were discussed from the psychophysiological standpoint. First, a cognitive neuropsychological model of input processing of repetition was shown. Based on the model, the author focused on the four levels of processing—word sound analysis, input phonological identification, input lexical identification and semantic decoding—and echoic memory. For each level, symptoms when typically disturbed and the underlying mechanisms thought to be behind the symptoms were discussed based on the clinical data. In addition, electroencephalographical methods for verifying the underlying mechanisms were suggested.
