Evidence for two interacting temporal channels in human visual processing

Vision Research
John Cass, David Alais

Abstract

Previous studies have generally estimated that two independent channels underlie human temporal vision: one broad and low-pass, the other high, and band-pass. We confirm this with iso-oriented targets and masks. With orthogonal masks, the same high-frequency channel emerges but no low-pass channel is observed, indicating the high-frequency channel is orientation invariant, and possibly pre-cortical in origin. In contrast, orientation dependence for low frequencies suggests a cortical origin. Subsequent masking experiments using unoriented spatiotemporal-filtered noise demonstrated that high-frequency masks (>8Hz) suppress low-frequency targets (1 and 4Hz), but low frequencies do not suppress high frequencies. This asymmetry challenges the traditional assumption of channel independence. To explain this, we propose a two-channel model in which a non-orientation-selective high-frequency channel suppresses an orientation-tuned low-frequency channel. This asymmetry may: (i) equalise the over-representation of low temporal-frequency energy in natural stimuli (1/f power spectrum); (ii) contribute to motion deblurring.

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Citations

Mar 18, 2009·Proceedings of the National Academy of Sciences of the United States of America·Daniel H Baker, Erich W Graf
Feb 1, 2011·Current Biology : CB·Thomas S A Wallis, Peter J Bex
Feb 17, 2009·Current Biology : CB·Thomas S A Wallis, Derek H Arnold
Jun 12, 2013·Vision Research·Welber Marinovic, Derek H Arnold
Sep 2, 2014·Vision Research·John Cass, Erik Van der Burg
Apr 30, 2009·Vision Research·Goro MaeharaRobert F Hess
Apr 26, 2011·Vision Research·Bettina HohbergerJan Kremers
May 10, 2011·Vision Research·Yosuke Okamoto, Seiji Nakagawa
May 18, 2016·Scientific Reports·Eckart ZimmermannGereon R Fink
Oct 30, 2016·Proceedings of the National Academy of Sciences of the United States of America·Derek H ArnoldMelvyn A Goodale
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Jan 11, 2013·Psychological Science·Welber MarinovicDerek H Arnold
Dec 14, 2016·Scientific Reports·Christina Derichs, Eckart Zimmermann
Oct 28, 2019·I-Perception·Christopher D BlairGideon P Caplovitz
Mar 27, 2020·Scientific Reports·Siddhesh Salelkar, Supratim Ray
Jul 29, 2017·Scientific Reports·George MatherTodd Parsons

Related Concepts

Psychological Orientation
Perceptual Masking
Photic Stimulation
Psychophysics
Sensory Thresholds
Time Perception
Optic Tract Structure
Contrast Sensitivity

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