Effects of attention on auditory evoked middle latency potentials.

The effects of attention on the auditory evoked middle latency potentials (MLPs) were examined in 23 normal subjects. Early positive-negative-positive-negative waves (about 8, 11, 15 and 18 msec peak latencies) and a late positive one (about 30 msec peak latency) were recorded from the unilateral mastoid-nose tip. The amplitudes of the early portions of MLPs to binaural 50 dB SL clicks during attention decreased as compared to those obtained when the subjects were not attending to the test stimuli.

A study of auditory middle latency responses in relation to electrode combinations and stimulus conditions.

Auditory middle latency responses were recorded from healthy right-handed subjects. Acoustic clicks at a rate of 10/s were presented to the subjects via headphones. Using the electrode combination unilateral mastoid-nose tip, responses characterized by two early negative waves (about 11.

Slow negative potentials during problem-solving.

Electroencephalographic changes by solving mathematical problems were tested on 52 healthy young subjects. Slow negative potentials appeared in the frontal lobe (Fz) when the subject was asked to add numerals presented by a slide projector, multiply them and add them while hearing other addition problems through headphones. The mean amplitude of the potential was larger in multiplication and in addition while hearing other addition problems than in addition.

Middle latency components of the auditory evoked response: lateral differences and changes by mental tasks.

Middle latency components in response to stimulation of both ears with 50 dB SL clicks at a rate of 10/sec were recorded in young healthy subjects from the left mastoid-nose tip and right mastoid-nose tip. All were right-handed. 1) Lateral differences were found in most subjects.

A schizophrenic subgroup: type A5.

This report concerns a group of schizophrenics whose visual evoked potential reduced in amplitude most markedly in A5 (averaged potential evoked by 1 Hz flashes which started 5 min after the addition test for 15 min). These patients in general had poor productive symptoms and progressed very slowly. Most of them were simple schizophrenics.