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Narrow-Band 1, 2, 3, 4, 8, 16, 24, 32, 48, 64, and 96 Cycles/360° Angular Frequency Filters

Published online by Cambridge University Press:  10 April 2014

Maria Lúcia De Bustamante Simas  and
Natanael Antonio Dos Santos
Maria Lúcia De Bustamante Simas*
Affiliation:
Universidade Federal de Pernambuco (Brazil)
Natanael Antonio Dos Santos
Affiliation:
Universidade Federal da Paraíba (Brazil)
*
Correspondence concerning this article should be sent to Maria Lúcia De Bustamante Simas, LabVis-UFPE, Departamento de Psicologia, Universidade Federal de Pernambuco, Rua Acadêmico Hélio Ramos s/n, 9° Andar, Recife, 50670-901, PE, Brazil. E-mail: maria.simas@uol.com.br and mlbs@ufpe.br
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Abstract

We measured human frequency response functions for eleven angular frequency filters using a forced-choice procedure in a supra-threshold summation paradigm. Each of the eleven functions of 17 experimental conditions was measured 4-9 times among 12 observers. Results show that, for the arbitrarily selected filter phases, maximum summation effect occurred at test frequency for all filters. These results lead to the conclusion that there are narrow-band angular frequency filters operating in human visual system mostly through summation surrounded by inhibition at the specific test frequency ranges. Our previous suggestion (Simas & Santos, 2002), arguing that summation for the higher angular frequency filters should occur if background angular frequency contrast were set to a maximum of 5 times the test frequency threshold, was supported.

Se midieron, en observadores humanos, las funciones de once filtros sintonizados a la frecuencia angular. Para ello se empleó un procedimiento de elección forzada en un paradigma de sumación supra-umbral. Cada una de las once funciones de las 17 condiciones experimentales se midió 4-9 veces para 12 observadores. Los resultados mostraron que, para todos los filtros y para las fases de filtro elegidas arbitrariamente, el efecto de sumación máxima ocurría a la frecuencia de prueba Este tipo de resultado lleva a concluir la existencia de filtros de frecuencia angular de banda estrecha que operan en el sistema visual humano, mayormente a través de sumación rodeada por inhibición en los rangos específicos de la frecuencia de prueba. Por otra parte, se obtuvo apoyo para nuestra anterior sugerencia (Simas y Santos, 2002) respecto a que la sumación para los filtros de frecuencia angular más alta debe ocurrir si el contraste de frecuencia angular de fondo se fija en un máximo de 5 veces el umbral de la frecuencia de prueba.

Keywords

spatial frequencyangular frequencynarrow-band frequency filterspolar gratingswindmill stimulifrecuencia espacialfrecuencia angularfiltros de frecuencia de banda estrechaenrejados polaresestímulos de molino de viento
Type
Monographic Section: Spatial Vision and Visual Space
Information
The Spanish Journal of Psychology , Volume 9 , Issue 2 , November 2006 , pp. 240 - 248
Copyright
Copyright © Cambridge University Press 2006

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