title: Spatial Frequency Components of Images Modulate Neuronal Activity in Monkey Amygdala.
abstract: Processing the spatial frequency components of an image is a crucial feature for visual perception, especially in recognition of faces. Here, we study the correlation between spatial frequency components of images of faces and neuronal activity in monkey amygdala while performing a visual recognition task. The frequency components of the images were analyzed using a fast Fourier transform for 40 spatial frequency ranges. We recorded 65 neurons showing statistically significant responses to at least one of the images used as a stimulus. A total of 37 of these neurons (n = 37) showed significant responses to at least three images, and in eight of them (8/37, 22%), we found a statistically significant correlation between neuron response and the modulus amplitude of at least one frequency range present in the images. Our results indicate that high spatial frequency and low spatial frequency components of images influence the activity of amygdala neurons.
authors.affiliation: Centre for Research in Molecular Medicine and Chronic Diseases (CIMUS), University of Santiago de Compostela, Santiago de Compostela, Spain mp.montes@usc.es.
authors.forename: Pilar
authors.initials: P
authors.lastname: Montes-Lourido
authors.affiliation: Centre for Research in Molecular Medicine and Chronic Diseases (CIMUS), University of Santiago de Compostela, Santiago de Compostela, Spain.
authors.forename: M A
authors.initials: MA
authors.lastname: Bermudez
authors.affiliation: Centre for Research in Molecular Medicine and Chronic Diseases (CIMUS), University of Santiago de Compostela, Santiago de Compostela, Spain.
authors.forename: M C
authors.initials: MC
authors.lastname: Romero
authors.affiliation: Centre for Research in Molecular Medicine and Chronic Diseases (CIMUS), University of Santiago de Compostela, Santiago de Compostela, Spain.
authors.forename: A F
authors.initials: AF
authors.lastname: Vicente
authors.affiliation: Centre for Research in Molecular Medicine and Chronic Diseases (CIMUS), University of Santiago de Compostela, Santiago de Compostela, SpainDepartment of Surgery, University of Santiago de Compostela, Santiago de Compostela, SpainOphthalmology Service and IDIS, Complejo Hospitalario Universitario de Santiago de Compostela, Santiago de Compostela, Spain.
authors.forename: F
authors.initials: F
authors.lastname: Gonzalez
mesh_terms: D000679:Amygdala / Q000502:physiology*; D000818:Animals; D000066499:Facial Recognition / Q000502:physiology*; D005583:Fourier Analysis; D008253:Macaca mulatta; D008297:Male; D009474:Neurons / Q000502:physiology*; D010364:Pattern Recognition, Visual / Q000502:physiology; D013028:Space Perception / Q000502:physiology*
keywords: Fourier transform; amygdala; monkey; spatial frequency