W F Wetzel

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This research evaluated Grodzinsky's (1984, 1986a) syntactic loss and Kolk and van Grunsven's (1985) working memory impairment explanations of syntactic comprehension deficits in agrammatic aphasics. Four aphasic patients were evaluated who showed different patterns of impairment on morphological and structural aspects of production. The comprehension tasks(More)
Auditory evoked responses (AERs) were recorded from left- and right-handed subjects who listened to consonant sounds from different phonetic categories. AERs recorded at parietal scalp regions indicated both groups differentiated categorical differences between speech sounds. However, hand preferences did not affect hemisphere responses to speech sounds.
The role of central motor processes in rehearsal was investigated by studying a brain-damaged patient with a severe articulatory impairment. Evidence is presented that his articulatory impairment is due to a disruption of motor programming rather than to peripheral muscle weakness. Despite his motor programming deficit, the patient showed normal auditory(More)
Categorical perception of place of articulation contrasts was evaluated in rhesus monkeys. The monkeys had been chronically exposed to subclinical levels of lead, either from conception to birth, or for approximately 6 months beginning at birth, or were never exposed to lead. Auditory evoked responses were recorded from scalp electrodes placed over left and(More)
In an attempt to observe how the brain processes presuppositional information, event-related potentials (ERPs) were recorded from 12 scalp electrodes placed over the left and right hemispheres of 10 adult subjects as they listened to sentences that contained either factive or nonfactive verbs. The stimulus sentences had been time-compressed to a duration of(More)
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