NDLI: Analysis of visual theta rhythm-experimental and theoretical evidence of visual sniffing

Content Provider	IEEE Xplore Digital Library
Author	Kozma, R. Freeman, W.J.
Copyright Year	2001
Description	Author affiliation: Div. of Comput. Sci., Memphis State Univ., TN, USA (Kozma, R.)
Abstract	The statistical properties of saccadic time intervals recorded in eye movements in human subjects were calculated. The probability density function of the inter-spike intervals exhibits a Poisson-type behavior with a maximum located at time lags around 600 ms. Such a value agrees well with the frequency of the theta rhythm observed in the visual cortex of mammals, in particular, rabbits. EEGs were recorded from 8/spl times/8 arrays of subdural electrodes at high density (6/spl times/6 mm) in rabbits trained to discriminate visual stimuli in a classical aversive paradigm. EEG patterns had the form of amplitude and phase modulation of this. The covariance between the spatial events revealed striking peaks in the theta range (2-7 Hz), even when the autospectrum of the EEG failed to show a prominent peak. Comparable sequences of spatial EEG patterns in the olfactory system occur at frequencies in the theta range, reflecting the driving by respiration. These multiple sets of observation suggest that the visual system may be driven by surges of sensory input that are occasioned by saccades. Further studies are indicated to analyze this relationship by cross correlating simultaneous recordings of saccades and scalp EEGs from the occipital leads.
Sponsorship	Int. Neural Network Soc.
Starting Page	1118
Ending Page	1121
File Size	361034
Page Count	4
File Format	PDF
ISBN	0780370449
ISSN	10987576
DOI	10.1109/IJCNN.2001.939517
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-07-15
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Electroencephalography Frequency Rabbits Humans Probability density function Rhythm Electrodes Phase modulation Olfactory Visual system
Content Type	Text
Resource Type	Article

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