PSYCH 161 Lecture Notes - Lecture 21: Cerebral Palsy, Speech Perception, Eric Lenneberg
Document Summary
Proposed solution to the lack of invariance problem. Disproved (in strong form) and abandoned by speech scientists. Damage to motor-speech systems can result in severe speech production deficits but do not similarly affect speech recognition. This includes damage to m1 (terao et al. , 2007), broca"s area (bilaterally) Levine & mohr, 1979 , anterior operculum (bilaterally) (weller, 1993), large frontoparietal cortex (naeser et al. , 1989). Failure to develop speech in developmental or acquired anarthria or in cerebral palsy does not preclude normal speech recognition (bishop et al. , 1990; christen et al. , 2000; lenneberg, 1962) Infants develop sophisticated speech perception abilities far before they develop speech (1 month old!) (eimas, siqueland, jusczyk, & vigorito, 1971) Chinchillas and quail perceive speech sound quite impressively (kuhl & miller, Evidence for motor involvement in speech perception. These are multi-step, multi-process tasks that involve more than perceiving speech sounds. Performance changes on these tasks can reflect any of these processing stages.
