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Coding of Luminance and Color Differences on Neurons in the Rabbit's Visual System

Published online by Cambridge University Press:  10 April 2014

Dmitry V. Evtikhin ,
Vladimir B. Polianskii ,
Dzekshen E. Alymkulov  and
Evgenii N. Sokolov†
Dmitry V. Evtikhin*
Affiliation:
Moscow State University (Russia)
Vladimir B. Polianskii
Affiliation:
Moscow State University (Russia)
Dzekshen E. Alymkulov
Affiliation:
Moscow State University (Russia)
Evgenii N. Sokolov†
Affiliation:
Moscow State University (Russia)
*
Correspondence concerning this article should be addressed to Dr. Dmitry Evtikhin, Department of higher nervous activity, Division of Biology, M.V. Lomonosov Moscow State University, Vorobiovy Gory, Moscow, Russia119991. E-mail: [email protected]
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Abstract

The neuronal activity in the rabbit's visual cortex, lateral geniculate nucleus and superior colliculus was investigated in responses to 8 color stimuli changes in pairs. This activity consisted of phasic responses (50-90 and 130-300 Ms after stimuli changes) and tonic response (after 300 Ms). The phasic responses used as a basis for the matrices (8 × 8) constructed for each neuron included the average of spikes/sec in responses to all stimuli changes. All matrices were treated by factor analysis and the basic axes of sensory spaces were revealed. Sensory spaces reconstructed from neuronal spike discharges had a two-dimensional (with brightness and darkness axes) or four-dimensional (with two color and two achromatic axes) structure. Thus it allowed us to split neurons into groups measuring only brightness differences and the measuring of color and brightness differences between stimuli. The tonic component of most of the neurons in the lateral geniculate nucleus showed linear correlation with changes in intensities; therefore, these neurons could be characterized as pre-detectors for cortical selective detectors. The neuronal spaces demonstrated a coincidence with spaces revealed by other methods. This fact may reflect the general principle of vector coding (Sokolov, 2000) of sensory information in the visual system.

Se examinaron la actividad neuronal en la corteza visual, el núcleo lateral geniculado y el collículo superior del conejo en las respuestas a 8 cambios de estímulos de color en parejas. Esta actividad consistía en respuestas fásicas (50-90 y 130-300 Ms después del cambio estimular) y respuesta tónica (después de 300 Ms). Las respuestas fásicas empleadas como una base para las matrices (8 × 8) construidas para cada neurona incluían la media de picos/segundo en respuestas a todos los cambios estimulares. Todas las matrices fueron tratadas por análisis factorial y se pusieron de manifiesto los ejes básicos de espacios sensoriales. Los espacios sensoriales reconstruidos de las descargas neuronales pico tenían una estructura bi-dimensional (con ejes de brillo y oscuridad) o de cuatro dimensiones (con dos ejes de color y dos ejes acromáticos). Así, nos permitió dividir las neuronas en grupos que sólo medían las diferencias en brillo y los que medían las diferencias entre los estímulos en color y brillantez. El componente tónico de la mayoría de las neuronas en el núcleo geniculado lateral mostraron una correlación linear con los cambios en las intensidades: de ahí, estas neuronas se podrían caracterizar como pre-detectores para los detectores corticales selectivos. Los espacios neuronales mostraron una coincidencia con los espacios revelados por otros métodos. Este hecho podría reflejar el principio general de la codificación vectorial (Sokolov, 2000) de la información sensorial en el sistema visual.

Keywords

neuronal activityperceptual spacevector codingcolor perceptionactividad neuronalespacio perceptualcodificación vectorialpercepción del color
Type
Articles
Information
The Spanish Journal of Psychology , Volume 11 , Issue 2 , November 2008 , pp. 349 - 362
Copyright
Copyright © Cambridge University Press 2008

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