A Phonetic Approach to the Problem of Perception in a Case of Wernicke’s Aphasia

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Abstract
Report of tests for speech sound perception in a 22-yr.-old person with WernickVs Aphasia. 6 tests of responses to various types of sounds, words, syllables were given. The following conclusions were reached: A considerable number of the subject''s incorrect responses resembled the test symbol; the subject''s difficulties were predominantly those of perception rather than initiation; without the cue of lip leading, diphthongs appear to present greater difficulty than pure vowels; consonants present more difficulty than vowels; when consonants are presented in isolation, surdity or sonority does not appear to influence the correctness of response; there is a tendency towards confusion in voicing and unvoicing certain sounds; perseveration occurs more frequently on words than on sounds; a tendency towards perseveration is greater when the time interval between stimulus words was 2 sees, as opposed to 15 secs.; when visual and auditory stimuli are presented together, there is less tendency towards perseveration than when only the auditory stimulus is presented; both 1- and 2-syllable words including surd consonants present greater difficulty than 1- and 2-syllable words including only sonant consonants; there is a tendency for final consonants to be incorrect or omitted. Corrective work with Wernicke''s aphasia must take into consideration this gradient of difficulty in perception.

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