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This paper deals with the functional correlates of the gamma response of the brain. A critical review of the literature findings reveals the existence of two types of gamma responses: an early gamma that fulfills sensory functions and a late gamma that fulfills perceptual-cognitive functions. However, even the early gamma shows individual differences. Such(More)
Female/male cognitive differences have been studied for some time; however, such differences in Turkish population is unknown. Evoked potentials (EPs) of the brain have been applied as an index of information processing in a wide variety of normal and cognitive impaired subjects. Scalp event-related potentials (ERP) evoked by auditory stimuli were recorded(More)
Reversal of light-dark cycle was used to investigate the effect of the circadian changes on skin conductance, a tonic electrodermal activity parameter, in rats. Rats were adapted for 3 wk. to one of two lighting programs. The animals on the normal cycle were illuminated from 08.00-20.00; on the reverse cycle, from 20.00-08.00. Although during Week 1 to Week(More)
The effects of immobilization stress on electrodermal activity (EDA); skin conductance response magnitude and rate, skin conductance level and habituation number, and brain catecholamine levels; norepinephrine (NE) and dopamine (DA) were investigated in rats. Electrodermal activity was recorded using constant current method. Brain catecholamine levels were(More)
The involvement of the central nervous system either in hypothyroidism or in hyperthyroidim has previously been shown on the basis of visual, auditory, somatosensory, and central motor evoked potential studies by some investigators. In to our previous study, we found that abnormal electrodermal activity in nonmedicated hyperthyroid patients was not(More)
UNLABELLED Recent electrophysiological studies on autonomic dysfunction in vitiligo patients show an autonomic dysfunction as measured by absent sympathetic skin response (SSR). Nothing is known about the reversibility of these autonomic parameters with treatment. The present study examined how Electrodermal Activity (EDA) parameters were affected from(More)
This study aimed to investigate the usefulness of auditory evoked potentials (AEPs) in rats. To this end, N1, P2 latencies, and the N1-P2 amplitude of responses to different acoustic stimuli from rats, which were implanted with permanent electrodes in the inferior colliculus (IC), were evaluated and used to demonstrate the frequency characteristics of IC(More)
In numerous investigations the P300-component of the event related potential has proved a valid indicator of memory activities. The present study explores the amplitude and latency of the components of event-related potential regarding short-term memory task. Event related potentials, elicited by auditory stimuli, were recorded in 40 healthy subjects. For(More)