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Visual processing of form: evidences for angular narrow-band frequency channels in humans

The aim of this work was to characterize and to compare the response curves of the human visual system for angular filters of 1 and 4 cycles/360º defined in polar coordinates. We measured 15 curves for each filter with 5 adult volunteers using a supra-threshold summation method with a forced-choice...

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Published in:	Psicologia, reflexão e crítica reflexão e crítica, 2005-01, Vol.18 (1), p.98
Main Authors:	Santos, Natanael Antonio dos, Nogueira, Renata Maria Toscano Barreto Lyra, Simas, Maria Lúcia de Bustamante
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Language:	Portuguese
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description	The aim of this work was to characterize and to compare the response curves of the human visual system for angular filters of 1 and 4 cycles/360º defined in polar coordinates. We measured 15 curves for each filter with 5 adult volunteers using a supra-threshold summation method with a forced-choice paradigm. The results showed maximum summation effects at test frequencies for angular (1 and 4 cycles/360º) filters surrounded on both sides by strong inhibition. These results were in agreement with the existence of channels or narrow-band angular filters operating in the human visual system either through summation or inhibition of specific frequency ranges.
doi_str_mv	10.1590/S0102-79722005000100013
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title	Visual processing of form: evidences for angular narrow-band frequency channels in humans
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