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Spatial frequency components influence cell activity in the inferotemporal cortex

Published online by Cambridge University Press:  01 July 2009

MARIA A. BERMUDEZ*
Affiliation:
Department of Physiology, School of Medicine, University of Santiago de Compostela, Santiago de Compostela, Spain
ANA F. VICENTE
Affiliation:
Department of Physiology, School of Medicine, University of Santiago de Compostela, Santiago de Compostela, Spain
MARIA C. ROMERO
Affiliation:
Department of Physiology, School of Medicine, University of Santiago de Compostela, Santiago de Compostela, Spain
ROGELIO PEREZ
Affiliation:
Department of Physiology, School of Medicine, University of Santiago de Compostela, Santiago de Compostela, Spain Service of Ophthalmology, Hospital of Monforte, Monforte de Lemos, Spain
FRANCISCO GONZALEZ
Affiliation:
Department of Physiology, School of Medicine, University of Santiago de Compostela, Santiago de Compostela, Spain Service of Ophthalmology, University Hospital, Santiago de Compostela, Spain
*
*Address correspondence and reprint requests to: Maria A. Bermudez, Department of Physiology, School of Medicine, University of Santiago de Compostela, c/San Francisco s/n, Santiago de Compostela E-15782, Spain. E-mail: maria.bermudez@usc.es

Abstract

We studied the correlation between the spatial frequency of complex stimuli and neuronal activity in the monkey inferotemporal (IT) cortex while performing a task that required visual recognition. Single-cell activity was recorded from the right IT cortex. The frequency components of the images used as stimuli were analyzed by using a fast Fourier transform, and a modulus was obtained for 40 spatial frequency ranges from 0.3 to 11.1 cycles/deg. We recorded 82 cells showing statistically significant responses (analysis of variance, P < 0.05) to at least one of the images used as a stimulus. Seventy-eight percent of these cells (n = 64) showed significant responses to at least three images, and in two thirds of them (n = 42), we found a statistically significant correlation (P < 0.05) between cell response and the modulus amplitude of at least one frequency range present in the images. Our results suggest that information about spatial frequency of the visual images is present in the IT cortex.

Information

Type
Brief Communication
Copyright
Copyright © Cambridge University Press 2009

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