Stimulus roving and flankers affect perceptual learning of contrast discrimination in Macaca mulatta.

'Stimulus roving' refers to a paradigm in which the properties of the stimuli to be discriminated vary from trial to trial, rather than being kept constant throughout a block of trials. Rhesus monkeys have previously been shown to improve their contrast discrimination performance on a non-...

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Autores principales:	Xing Chen, Mehdi Sanayei, Alexander Thiele
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2014
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/bd5056219d724926b230a75fa2423ed4
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spelling	oai:doaj.org-article:bd5056219d724926b230a75fa2423ed42021-11-25T05:55:30ZStimulus roving and flankers affect perceptual learning of contrast discrimination in Macaca mulatta.1932-620310.1371/journal.pone.0109604https://doaj.org/article/bd5056219d724926b230a75fa2423ed42014-01-01T00:00:00Zhttps://doi.org/10.1371/journal.pone.0109604https://doaj.org/toc/1932-6203'Stimulus roving' refers to a paradigm in which the properties of the stimuli to be discriminated vary from trial to trial, rather than being kept constant throughout a block of trials. Rhesus monkeys have previously been shown to improve their contrast discrimination performance on a non-roving task, in which they had to report the contrast of a test stimulus relative to that of a fixed-contrast sample stimulus. Human psychophysics studies indicate that roving stimuli yield little or no perceptual learning. Here, we investigate how stimulus roving influences perceptual learning in macaque monkeys and how the addition of flankers alters performance under roving conditions. Animals were initially trained on a contrast discrimination task under non-roving conditions until their performance levels stabilized. The introduction of roving contrast conditions resulted in a pronounced drop in performance, which suggested that subjects initially failed to heed the sample contrast and performed the task using an internal memory reference. With training, significant improvements occurred, demonstrating that learning is possible under roving conditions. To investigate the notion of flanker-induced perceptual learning, flanker stimuli (30% fixed-contrast iso-oriented collinear gratings) were presented jointly with central (roving) stimuli. Presentation of flanker stimuli yielded substantial performance improvements in one subject, but deteriorations in the other. Finally, after the removal of flankers, performance levels returned to their pre-flanker state in both subjects, indicating that the flanker-induced changes were contingent upon the continued presentation of flankers.Xing ChenMehdi SanayeiAlexander ThielePublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 9, Iss 10, p e109604 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Xing Chen Mehdi Sanayei Alexander Thiele Stimulus roving and flankers affect perceptual learning of contrast discrimination in Macaca mulatta.
description	'Stimulus roving' refers to a paradigm in which the properties of the stimuli to be discriminated vary from trial to trial, rather than being kept constant throughout a block of trials. Rhesus monkeys have previously been shown to improve their contrast discrimination performance on a non-roving task, in which they had to report the contrast of a test stimulus relative to that of a fixed-contrast sample stimulus. Human psychophysics studies indicate that roving stimuli yield little or no perceptual learning. Here, we investigate how stimulus roving influences perceptual learning in macaque monkeys and how the addition of flankers alters performance under roving conditions. Animals were initially trained on a contrast discrimination task under non-roving conditions until their performance levels stabilized. The introduction of roving contrast conditions resulted in a pronounced drop in performance, which suggested that subjects initially failed to heed the sample contrast and performed the task using an internal memory reference. With training, significant improvements occurred, demonstrating that learning is possible under roving conditions. To investigate the notion of flanker-induced perceptual learning, flanker stimuli (30% fixed-contrast iso-oriented collinear gratings) were presented jointly with central (roving) stimuli. Presentation of flanker stimuli yielded substantial performance improvements in one subject, but deteriorations in the other. Finally, after the removal of flankers, performance levels returned to their pre-flanker state in both subjects, indicating that the flanker-induced changes were contingent upon the continued presentation of flankers.
format	article
author	Xing Chen Mehdi Sanayei Alexander Thiele
author_facet	Xing Chen Mehdi Sanayei Alexander Thiele
author_sort	Xing Chen
title	Stimulus roving and flankers affect perceptual learning of contrast discrimination in Macaca mulatta.
title_short	Stimulus roving and flankers affect perceptual learning of contrast discrimination in Macaca mulatta.
title_full	Stimulus roving and flankers affect perceptual learning of contrast discrimination in Macaca mulatta.
title_fullStr	Stimulus roving and flankers affect perceptual learning of contrast discrimination in Macaca mulatta.
title_full_unstemmed	Stimulus roving and flankers affect perceptual learning of contrast discrimination in Macaca mulatta.
title_sort	stimulus roving and flankers affect perceptual learning of contrast discrimination in macaca mulatta.
publisher	Public Library of Science (PLoS)
publishDate	2014
url	https://doaj.org/article/bd5056219d724926b230a75fa2423ed4
work_keys_str_mv	AT xingchen stimulusrovingandflankersaffectperceptuallearningofcontrastdiscriminationinmacacamulatta AT mehdisanayei stimulusrovingandflankersaffectperceptuallearningofcontrastdiscriminationinmacacamulatta AT alexanderthiele stimulusrovingandflankersaffectperceptuallearningofcontrastdiscriminationinmacacamulatta
_version_	1718414423481122816

Stimulus roving and flankers affect perceptual learning of contrast discrimination in Macaca mulatta.

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