Cargando…

The timing of binding and segregation of two compound aftereffects

Temporal information in a scene is thought to be an important cue for visual grouping of local image features into a single object. The majority of studies on this topic have attempted to determine the conditions that facilitate segregation of a figure from a cluttered background. Here we examine th...

Descripción completa

Detalles Bibliográficos
Autores principales: McGovern, David P., Hancock, Sarah, Peirce, Jonathan W.
Formato: Texto
Lenguaje:English
Publicado: Elsevier Science Ltd 2011
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3093619/
https://www.ncbi.nlm.nih.gov/pubmed/21376074
http://dx.doi.org/10.1016/j.visres.2011.02.017
_version_ 1782203481311936512
author McGovern, David P.
Hancock, Sarah
Peirce, Jonathan W.
author_facet McGovern, David P.
Hancock, Sarah
Peirce, Jonathan W.
author_sort McGovern, David P.
collection PubMed
description Temporal information in a scene is thought to be an important cue for visual grouping of local image features into a single object. The majority of studies on this topic have attempted to determine the conditions that facilitate segregation of a figure from a cluttered background. Here we examine the temporal characteristics of two aftereffects that appear to have roles in visual integration: the curvature aftereffect (CAE; Hancock & Peirce, 2008) and plaid-selective contrast adaptation (Peirce & Taylor, 2006). Both aftereffects used a “compound adaptation” paradigm measuring adaptation to a compound stimulus that cannot be explained by adaptation to its components presented in isolation. The temporal tuning characteristics of the two aftereffects differed in three distinct ways. First, plaid-selective adaptation was very sensitive to temporal phase asynchronies, while the CAE was not. Second, while both aftereffects showed integration of alternating components above 4 Hz, for plaids the overall magnitude of adaptation was less than to synchronous stimuli and was eliminated at the highest frequencies. Finally, plaid-selective adaptation demonstrated a low-pass dependency for temporal flicker frequency of synchronous gratings, whereas the CAE did not. Overall, these results suggest that at least two different mechanisms are involved in the binding/segregation of local signals into compound patterns: one with high temporal resolution that allows rapid parsing of plaid patterns into their components and one with a coarser temporal sensitivity that mediates the CAE.
format Text
id pubmed-3093619
institution National Center for Biotechnology Information
language English
publishDate 2011
publisher Elsevier Science Ltd
record_format MEDLINE/PubMed
spelling pubmed-30936192011-07-12 The timing of binding and segregation of two compound aftereffects McGovern, David P. Hancock, Sarah Peirce, Jonathan W. Vision Res Article Temporal information in a scene is thought to be an important cue for visual grouping of local image features into a single object. The majority of studies on this topic have attempted to determine the conditions that facilitate segregation of a figure from a cluttered background. Here we examine the temporal characteristics of two aftereffects that appear to have roles in visual integration: the curvature aftereffect (CAE; Hancock & Peirce, 2008) and plaid-selective contrast adaptation (Peirce & Taylor, 2006). Both aftereffects used a “compound adaptation” paradigm measuring adaptation to a compound stimulus that cannot be explained by adaptation to its components presented in isolation. The temporal tuning characteristics of the two aftereffects differed in three distinct ways. First, plaid-selective adaptation was very sensitive to temporal phase asynchronies, while the CAE was not. Second, while both aftereffects showed integration of alternating components above 4 Hz, for plaids the overall magnitude of adaptation was less than to synchronous stimuli and was eliminated at the highest frequencies. Finally, plaid-selective adaptation demonstrated a low-pass dependency for temporal flicker frequency of synchronous gratings, whereas the CAE did not. Overall, these results suggest that at least two different mechanisms are involved in the binding/segregation of local signals into compound patterns: one with high temporal resolution that allows rapid parsing of plaid patterns into their components and one with a coarser temporal sensitivity that mediates the CAE. Elsevier Science Ltd 2011-05-11 /pmc/articles/PMC3093619/ /pubmed/21376074 http://dx.doi.org/10.1016/j.visres.2011.02.017 Text en © 2011 Elsevier Ltd. https://creativecommons.org/licenses/by/3.0/ Open Access under CC BY 3.0 (https://creativecommons.org/licenses/by/3.0/) license
spellingShingle Article
McGovern, David P.
Hancock, Sarah
Peirce, Jonathan W.
The timing of binding and segregation of two compound aftereffects
title The timing of binding and segregation of two compound aftereffects
title_full The timing of binding and segregation of two compound aftereffects
title_fullStr The timing of binding and segregation of two compound aftereffects
title_full_unstemmed The timing of binding and segregation of two compound aftereffects
title_short The timing of binding and segregation of two compound aftereffects
title_sort timing of binding and segregation of two compound aftereffects
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3093619/
https://www.ncbi.nlm.nih.gov/pubmed/21376074
http://dx.doi.org/10.1016/j.visres.2011.02.017
work_keys_str_mv AT mcgoverndavidp thetimingofbindingandsegregationoftwocompoundaftereffects
AT hancocksarah thetimingofbindingandsegregationoftwocompoundaftereffects
AT peircejonathanw thetimingofbindingandsegregationoftwocompoundaftereffects
AT mcgoverndavidp timingofbindingandsegregationoftwocompoundaftereffects
AT hancocksarah timingofbindingandsegregationoftwocompoundaftereffects
AT peircejonathanw timingofbindingandsegregationoftwocompoundaftereffects