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Multidimensional Scaling of Schematically Represented Faces Based on Dissimilarity Estimates and Evoked Potentials of Differences Amplitudes

Published online by Cambridge University Press:  10 April 2014

Chingiz A. Izmailov ,
Evgeni N. Sokolov  and
Svetlana G. Korshunova
Chingiz A. Izmailov*
Affiliation:
Moscow State University
Evgeni N. Sokolov
Affiliation:
Moscow State University
Svetlana G. Korshunova
Affiliation:
Moscow State University
*
Correspondence should be addressed to Ch. A. Izmailov, Moscow State University. E-mail: [email protected]
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Abstract

This study researches the input of the cerebral occipital and temporal cortex in the analysis of facial configuration and expressive characteristics. Analysis is based on the construction of a spherical model for the differentiation of schematically presented faces with quantitatively altering curvature of the mouth and brows. The model is designed using the method of multidimensional scaling of the dissimilarity judgments between stimuli (faces) and the amplitude of evoked potentials of differences (EPD) between abrupt stimulus changes recorded from the occipital and posterior temporal cortex. Analysis of the structure of the spherical model of facial differentiation depending on the electrode site and the latency of the EPD component within the duration of 120-240 ms has demonstrated that the activity of the occipital and posterior temporal cortex of the right hemisphere is associated with the emotional characteristics of the presented face, whereas facial configuration is reflected in the activation of both posterior temporal cortex and the occipital cortex of the left hemisphere. At all electrode sites maximum information of the emotional expression and configuration is represented in inter-peak amplitude P120-N180. With increasing latency there is increased distortion of the structure of differences in the spherical model of schematically presented faces, which is interpreted as an attenuation of electrical activity associated with the analysis of the emotional expression, which occurs more rapidly than configuration analysis.

Este estudio investiga la entrada del córtex cerebral occipital y temporal en el análisis de la confirguración facial y de las características expresivas. El análisis se basa en la construcción de un modelo esférico de diferenciación de caras presentadas esquemáticamente cuando la curvatura de boca y cejas varía quantitativamente. El modelo se ha diseñado empleando el método de escalonamiento multidimensional de los juicios de disimilitud entre los estímulos (caras) y la amplitud de los potenciales evocados de las diferencias (PED) entre los cambios abruptos de los estímulos registrados desde el córtex occipital y temporal posterior. Dependiendo del lugar de inserción del electrodo y la latencia del componente PED, el análisis de la estructura del modelo esférico de diferenciación facial en de la duración de 120-240 ms ha demostrado que la actividad del córtex occipital y temporal posterior del hemisferio derecho se asocia con las características emocionales de la cara presentada, y que la confguración facial se refleja en la activación de los córtex temporal posterior y occipital del hemisferio izquierdo. En todos los lugares de inserción de los electrodos, la máxima información de la expresión y configuración emocional se representa en una amplitud inter-pico de P120-N180. Al incrementar la latencia, aumenta la distorsión de la esturtura de las diferencias en el modelo esférico de caras presentadas esquemáticamente, lo cual se interpreta como la atenuación de la actividad eléctrica asociada al análisis de la expresión emocional, el cual ocurre más rápidamente que el análisis configuracional.

Keywords

perception of schematically presented facesevoked potentials of differencesmultidimensional scalingfacial expressionconfiguration characteristicspercepción de caras presentadas esquemáticamentepotenciales evocados de diferenciasescalonamiento multidimensionalexpresión facialcaracterísticas configuracionales
Type
Articles
Information
The Spanish Journal of Psychology , Volume 8 , Issue 2 , November 2005 , pp. 119 - 133
Copyright
Copyright © Cambridge University Press 2005

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