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Disorder in sequential speech perception: a case study on pure word deafness
S Nakakoshi1, M Kashino, A Mizobuchi
1Tokyo Metropolitan Okubo Hospital, Japan. CZQ04340@niftyserve.or.jp
Brain and Language
|March 20, 2001
Summary
Brain damage can impair speech perception, causing a "negative recency effect" where recent syllables are harder to recall. This impacts auditory processing and memory load for speech sound sequences.
Area of Science:
- Neuroscience
- Psycholinguistics
- Cognitive Psychology
Background:
- Investigating the specific effects of brain damage on auditory speech perception.
- Understanding the mechanisms underlying speech sequence processing and recall.
Observation:
- A patient exhibited unique deficits in perceiving syllable sequences post-brain injury.
- Experiments revealed a "negative recency effect," characterized by poor repetition of later syllables in a sequence.
Findings:
- The "negative recency effect" in speech perception stems from slowed speech sound processing.
- Memory load from processing preceding syllables hinders subsequent phonological coding.
- These memory-holding processes are modality-nonspecific, affecting auditory processing.
Implications:
- Highlights the complex relationship between brain function, speech perception, and memory.
- Suggests potential targets for therapeutic interventions in speech processing disorders.
- Informs models of auditory working memory and phonological processing.