Journal ArticleDOI
Dynamics of potentials evoked in the auditory pathway and reticular formation of the cat. Studies during waking and sleep stages.
Ç. Özesmi,Erol Başar +1 more
TLDR
Averaged evoked potentials in the inferior colliculus, medial geniculate nucleus and reticular formation of chronically implanted and freely moving cats and the amplitude characteristics of these nuclei were compared with other brain structures reveals that the existence of a number of peaks (waves) with different latencies in the time course does not necessarily indicate theexistence of different functional structures or neural groups giving rise to these waves.Abstract:
Averaged evoked potentials in the inferior colliculus (IC), medial geniculate nucleus (MG) and reticular formation (RF) of chronically implanted and freely moving cats were measured using auditory step functions in the form of tone bursts of 2000 Hz. The most prominent components of the AEP of the inferior colliculus were a positive wave of 13 msec and a negative wave of 40–55 msec latency. The AEP of the medial geniculate nucleus was characterized by a large negative wave peaking at 35–40 msec. During spindle sleep and slow wave sleep stages changes in the AEPs of both nuclei occured.read more
Citations
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Journal ArticleDOI
Alpha oscillations in brain functioning: an integrative theory.
TL;DR: The old concept stating that EEG alpha (10-Hz) activity reflects passive or idling states of the brain is giving way to modern views of 10-Hz oscillations in relation to diverse brain functions comprising sensory, motor, and memory processes.
Journal ArticleDOI
Dynamics of brain rhythmic and evoked potentials
TL;DR: In this paper, the amplitude frequency and power spectral density functions computed from the simultaneously recorded spontaneous activity of these structures are also presented, in order to evaluate the common features of their system characteristics, and elaboration of a working hypothesis for the dynamics of potentials of the brain.
Journal ArticleDOI
Dynamics of brain rhythmic and evoked potentials. II. Studies in the auditory pathway, reticular formation, and hippocampus during the waking stage.
TL;DR: In this study, the simultaneously recorded and selectively averaged evoked potentials in some of the structures of the auditory pathway, in the reticular formation and the hippocampus of the awake cat as well as the simultaneous amplitude frequency characteristics of these structures are given.
Journal ArticleDOI
Dynamics of brain rhythmic and evoked potentials. III. Studies in the auditory pathway, reticular formation, and hippocampus during sleep.
TL;DR: Determination of the dynamics of potentials simultaneously obtained from various structures, in order to evaluate the common features of their system characteristics and the relationship (or interactions) between rhythmic activity and evoked potentials of the brain.
Journal ArticleDOI
Cortical visual evoked potentials during the sleep-wakefulness cycle in the freely moving cat. A dynamic study.
TL;DR: The statistical analysis between mean frequencies from both EEG prior to the stimulus and single evoked potential, within each sleep stage, showed that the main changes occurred during slow sleep, with a significant increase in the percentage of the alpha band.
References
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Journal ArticleDOI
Linear Analysis of the Dynamics of Neural Masses
TL;DR: The purpose of this review is to suggest that linear systems analysis can provide a very useful structure for measuring compound neural responses and for comprehending some of the elementary underlying dynamics.
Journal ArticleDOI
A study of the time and frequency characteristics of the potentials evoked in the acoustical cortex
TL;DR: The amplitude frequency characteristic obtained with this semi-empirical method depicts maxima of EEG-amplitude in frequency ranges of 10–13 Hz and 60–80 Hz.
Journal ArticleDOI
A component analysis and principles derived for the understanding of evoked potentials of the brain: studies in the hippocampus.
Erol Başar,P. Ungan +1 more
TL;DR: The hippocampal averaged evoked potentials of the cat brain were analysed using a theoretical filtering method that supports and enlarges previous findings and interpretations of Başar and Özesmi (1972) based on frequency characteristics of the hippocampus.
Journal ArticleDOI
The hippocampal EEG-activity and a systems analytical interpretation of averaged evoked potentials of the brain
Erol Başar,Ç. Özesmi +1 more
TL;DR: The use of the mathematical method (Laplace transform) indicates that the simple knowledge of the latencies and the number of potential waves cannot allow exact statements on mechanisms causing the formation of these peaks in the transient evoked response.
Journal ArticleDOI
Dynamic characteristics of visual evoked potentials in the dog. I. Cortical and subcortical potentials evoked by sine wave modulated light.
TL;DR: The essential non-linearities correspond to rectification occurring in “on” and “off” neuronal populations; they were the dominant features of SML evoked potentials in the lateral geniculate nucleus and the calcarine region of occipital cortex, but not in the posterior marginal gyrus.
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