An electrophysiological study of visual processing in Alzheimer's disease

Gastone G. Celesia; Alessandro E P Villa; Mitchell Brigell; Guido Rubboli; Gastone Bolcioni; Mario G. Fiori

doi:10.1016/0013-4694(93)90116-D

An electrophysiological study of visual processing in Alzheimer's disease

Gastone G. Celesia, Alessandro E P Villa, Mitchell Brigell, Guido Rubboli, Gastone Bolcioni, Mario G. Fiori

Istituto Scienze Neurologiche

Research output: Contribution to journal › Article › peer-review

Abstract

Visual processing of sinusoidally modulated gratings was studied in a group of patients (n = 11) with Alzheimer's disease (AD) and an elderly normal control group (n = 9). Spatial square wave gratings (1.47 c/d) were reversed at a temporal frequency of 4 or 8 Hz. EEG recordings at rest and during visual stimulation were obtained from 20 channels using the 10/20 international system. The power spectrum of the 2nd and 4th harmonic of the stimulation frequency was calculated by Fast Fourier Transform (FFT) at a resolution of 0.25 Hz. Association of activity between occipital, temporal, parietal and central regions was measured by intra- and inter-hemispheric coherence and phase at harmonics of the stimulation frequency. A significant difference (P

Original language	English
Pages (from-to)	97-104
Number of pages	8
Journal	Electroencephalography and Clinical Neurophysiology
Volume	87
Issue number	3
DOIs	https://doi.org/10.1016/0013-4694(93)90116-D
Publication status	Published - 1993

Keywords

Alzheimer's disease
EEG
Intra-hemispheric coherence
Visual dysfunction
Visual stimulation

ASJC Scopus subject areas

Clinical Neurology
Neuroscience(all)

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10.1016/0013-4694(93)90116-D

Cite this

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title = "An electrophysiological study of visual processing in Alzheimer's disease",

abstract = "Visual processing of sinusoidally modulated gratings was studied in a group of patients (n = 11) with Alzheimer's disease (AD) and an elderly normal control group (n = 9). Spatial square wave gratings (1.47 c/d) were reversed at a temporal frequency of 4 or 8 Hz. EEG recordings at rest and during visual stimulation were obtained from 20 channels using the 10/20 international system. The power spectrum of the 2nd and 4th harmonic of the stimulation frequency was calculated by Fast Fourier Transform (FFT) at a resolution of 0.25 Hz. Association of activity between occipital, temporal, parietal and central regions was measured by intra- and inter-hemispheric coherence and phase at harmonics of the stimulation frequency. A significant difference (P",

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AU - Celesia, Gastone G.

AU - Villa, Alessandro E P

AU - Brigell, Mitchell

AU - Rubboli, Guido

AU - Bolcioni, Gastone

AU - Fiori, Mario G.

PY - 1993

Y1 - 1993

N2 - Visual processing of sinusoidally modulated gratings was studied in a group of patients (n = 11) with Alzheimer's disease (AD) and an elderly normal control group (n = 9). Spatial square wave gratings (1.47 c/d) were reversed at a temporal frequency of 4 or 8 Hz. EEG recordings at rest and during visual stimulation were obtained from 20 channels using the 10/20 international system. The power spectrum of the 2nd and 4th harmonic of the stimulation frequency was calculated by Fast Fourier Transform (FFT) at a resolution of 0.25 Hz. Association of activity between occipital, temporal, parietal and central regions was measured by intra- and inter-hemispheric coherence and phase at harmonics of the stimulation frequency. A significant difference (P

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KW - EEG

KW - Intra-hemispheric coherence

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An electrophysiological study of visual processing in Alzheimer's disease

Abstract

Keywords

ASJC Scopus subject areas

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