Detection and recognition of angular frequency patterns

Vision Research
Hugh R Wilson, Roni Propp

Abstract

Previous research has extensively explored visual encoding of smoothly curved, closed contours described by sinusoidal variation of pattern radius as a function of polar angle (RF patterns). Although the contours of many biologically significant objects are curved, we also confront shapes with a more jagged and angular appearance. To study these, we introduce here a novel class of visual stimuli that deform smoothly from a circle to an equilateral polygon with N sides (AF patterns). Threshold measurements reveal that both AF and RF patterns can be discriminated from circles at the same deformation amplitude, approximately 18.0arcsec, which is in the hyperacuity range. Thresholds were slightly higher for patterns with 3.0 cycles than for those with 5.0 cycles. Discrimination between AF and RF patterns was 75% correct at an amplitude that was approximately 3.0 times the threshold amplitude, which implies that AF and RF patterns activate different neural populations. Experiments with jittered patterns in which the contour was broken into several pieces and shifted inward or outward had much less effect on AF patterns than on RF patterns. Similarly, thresholds for single angles of AF patterns showed no significant difference from t...Continue Reading

References

Jan 1, 1974·Kybernetik·R F Quick
Jan 20, 1999·Vision Research·F WilkinsonC Habak
Sep 14, 2000·Neuron·J L GallantJ A Mazer
Nov 12, 2002·Nature Neuroscience·Anitha Pasupathy, Charles E Connor
Nov 27, 2002·Vision Research·Hugh R WilsonFrances Wilkinson
Feb 22, 2003·Vision Research·Gunter LofflerFrances Wilkinson
Oct 23, 2003·Visual Neuroscience·Jay Hegdé, David C Van Essen
Apr 15, 2005·Journal of Cognitive Neuroscience·Alice J O'TooleJames V Haxby
Sep 18, 2007·Nature Neuroscience·Akiyuki AnzaiDavid C Van Essen
Aug 16, 2008·Vision Research·Jason Bell, David R Badcock
Oct 5, 2010·Journal of Vision·Jason BellJonathan W Peirce
Dec 15, 2010·Journal of Vision·J Edwin DickinsonDavid R Badcock
Feb 15, 2011·Current Biology : CB·Eric T CarlsonCharles E Connor
Mar 21, 2012·Vision Research·Gunnar SchmidtmannGunter Loffler
Dec 1, 2012·Journal of Vision·J Edwin DickinsonDavid R Badcock
Jun 26, 2013·Neuron·Anirvan S NandyJude F Mitchell
May 16, 2014·The Journal of Neuroscience : the Official Journal of the Society for Neuroscience·Shahin NasrRoger B H Tootell

❮ Previous
Next ❯

Citations

Jul 22, 2018·Journal of Vision·Robert J GreenDavid R Badcock
Dec 31, 2020·Journal of Neurophysiology·Ken W S TanPaul V McGraw

❮ Previous
Next ❯

Related Concepts

Related Feeds

Atrial Filbrillation

Atrial fibrillation refers to the abnormal heart rhythm characterized by rapid and irregular beating of the atria. Here is the latest research.

Aphasia

Aphasia affects the ability to process language, including formulation and comprehension of language and speech, as well as the ability to read or write. Here is the latest research on aphasia.

Arrhythmia

Arrhythmias are abnormalities in heart rhythms, which can be either too fast or too slow. They can result from abnormalities of the initiation of an impulse or impulse conduction or a combination of both. Here is the latest research on arrhythmias.

Atrial Fibrillation

Atrial fibrillation is a common arrhythmia that is associated with substantial morbidity and mortality, particularly due to stroke and thromboembolism. Here is the latest research.

Related Papers

Optometry and Vision Science : Official Publication of the American Academy of Optometry
Y Z Wang
© 2021 Meta ULC. All rights reserved