Is mislocalization during saccades related to the position of the saccade target within the image or to the gaze position at the end of the saccade?

A stimulus that is flashed around the time of a saccade tends to be mislocalized in the direction of the saccade target. Our question is whether the mislocalization is related to the position of the saccade target within the image or to the gaze position at the end of the saccade. We separated the t...

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Main Authors: Maria Matziridi, Eli Brenner, Jeroen B J Smeets
Format: Article
Language:English
Published: Public Library of Science (PLoS) 2013-01-01
Series:PLoS ONE
Online Access:http://europepmc.org/articles/PMC3633890?pdf=render
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spelling doaj-9bc29613afce410ab7c332d0c47a380e2020-11-25T01:19:09ZengPublic Library of Science (PLoS)PLoS ONE1932-62032013-01-0184e6243610.1371/journal.pone.0062436Is mislocalization during saccades related to the position of the saccade target within the image or to the gaze position at the end of the saccade?Maria MatziridiEli BrennerJeroen B J SmeetsA stimulus that is flashed around the time of a saccade tends to be mislocalized in the direction of the saccade target. Our question is whether the mislocalization is related to the position of the saccade target within the image or to the gaze position at the end of the saccade. We separated the two with a visual illusion that influences the perceived distance to the target of the saccade and thus saccade endpoint without affecting the perceived position of the saccade target within the image. We asked participants to make horizontal saccades from the left to the right end of the shaft of a Müller-Lyer figure. Around the time of the saccade, we flashed a bar at one of five possible positions and asked participants to indicate its location by touching the screen. As expected, participants made shorter saccades along the fins-in (<->) configuration than along the fins-out (>-<) configuration of the figure. The illusion also influenced the mislocalization pattern during saccades, with flashes presented with the fins-out configuration being perceived beyond flashes presented with the fins-in configuration. The difference between the patterns of mislocalization for bars flashed during the saccade for the two configurations corresponded quantitatively with a prediction based on compression towards the saccade endpoint considering the magnitude of the effect of the illusion on saccade amplitude. We conclude that mislocalization is related to the eye position at the end of the saccade, rather than to the position of the saccade target within the image.http://europepmc.org/articles/PMC3633890?pdf=render
collection DOAJ
language English
format Article
sources DOAJ
author Maria Matziridi
Eli Brenner
Jeroen B J Smeets
spellingShingle Maria Matziridi
Eli Brenner
Jeroen B J Smeets
Is mislocalization during saccades related to the position of the saccade target within the image or to the gaze position at the end of the saccade?
PLoS ONE
author_facet Maria Matziridi
Eli Brenner
Jeroen B J Smeets
author_sort Maria Matziridi
title Is mislocalization during saccades related to the position of the saccade target within the image or to the gaze position at the end of the saccade?
title_short Is mislocalization during saccades related to the position of the saccade target within the image or to the gaze position at the end of the saccade?
title_full Is mislocalization during saccades related to the position of the saccade target within the image or to the gaze position at the end of the saccade?
title_fullStr Is mislocalization during saccades related to the position of the saccade target within the image or to the gaze position at the end of the saccade?
title_full_unstemmed Is mislocalization during saccades related to the position of the saccade target within the image or to the gaze position at the end of the saccade?
title_sort is mislocalization during saccades related to the position of the saccade target within the image or to the gaze position at the end of the saccade?
publisher Public Library of Science (PLoS)
series PLoS ONE
issn 1932-6203
publishDate 2013-01-01
description A stimulus that is flashed around the time of a saccade tends to be mislocalized in the direction of the saccade target. Our question is whether the mislocalization is related to the position of the saccade target within the image or to the gaze position at the end of the saccade. We separated the two with a visual illusion that influences the perceived distance to the target of the saccade and thus saccade endpoint without affecting the perceived position of the saccade target within the image. We asked participants to make horizontal saccades from the left to the right end of the shaft of a Müller-Lyer figure. Around the time of the saccade, we flashed a bar at one of five possible positions and asked participants to indicate its location by touching the screen. As expected, participants made shorter saccades along the fins-in (<->) configuration than along the fins-out (>-<) configuration of the figure. The illusion also influenced the mislocalization pattern during saccades, with flashes presented with the fins-out configuration being perceived beyond flashes presented with the fins-in configuration. The difference between the patterns of mislocalization for bars flashed during the saccade for the two configurations corresponded quantitatively with a prediction based on compression towards the saccade endpoint considering the magnitude of the effect of the illusion on saccade amplitude. We conclude that mislocalization is related to the eye position at the end of the saccade, rather than to the position of the saccade target within the image.
url http://europepmc.org/articles/PMC3633890?pdf=render
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