J A Schwafel

Learn More
The effects of a cholinergic antagonist (scopolamine) and agonist (physostigmine) on the auditory middle latency evoked responses (MLRs) were studied in 7 normal male volunteers. Scalp recordings were made from a central (Cz) electrode referenced to linked ear lobes on one channel and to a non-cephalic, sternovertebral reference on a second channel. Three(More)
MLR recordings from a group of 11 high-functioning adult autistic subjects were compared with those from a control group of 11 normal subjects. Components selected for analysis were "Pa", the maximum positivity in the 25-40 msec latency range following stimulus onset, "P1", the maximum positivity within the 50-65 msec latency range, and "Nb," the maximum(More)
Auditory brain stem EPs elicited in 10 normal adults by monaural clicks delivered at 72 dB HL, 20/sec showed no significant change in wave latencies or in the ratio of wave I to wave Y amplitude across 250 trial subsets, across 250 trial subsets, across 1500 trial blocks within a test session, or across two test sessions separated by several months. Sources(More)
Lack of exposure to specific sensory patterns during critical periods of development can result in a lack of responsiveness to those stimuli in adulthood. The present study extends these observations to native speakers of Japanese, a language which does not contain the contrastive /r/ and /l/ sounds present in English. Both electrophysiological (P3(More)
Autistic persons are known to have serious abnormalities in speech prosody. The present study attempted to ascertain whether autistic persons could discriminate and/or recognize prosodic contrasts in auditory stimuli. A group of 11 adult autistic subjects with normal IQ and an age-matched group of normal subjects were studied electrophysiologically and(More)
  • 1