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‘Alternate-goal bias’ in antisaccades and the influence of expectation

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Author(s)
Mathias AbeggAmadeo R. RodriguezHyung LeeJason J. S. Barton
Keimyung Author(s)
Lee, Hyung
Department
Dept. of Neurology (신경과학)
Journal Title
Experimental Brain Research
Issued Date
2010
Volume
203
Issue
3
Abstract
Saccadic performance depends on the requirements
of the current trial, but also may be inXuenced by
other trials in the same experiment. This eVect of trial context
has been investigated most for saccadic error rate and
reaction time but seldom for the positional accuracy of
saccadic landing points. We investigated whether the direction
of saccades towards one goal is aVected by the location
of a second goal used in other trials in the same experimental
block. In our Wrst experiment, landing points (‘endpoints’)
of antisaccades but not prosaccades were shifted
towards the location of the alternate goal. This spatial bias
decreased with increasing angular separation between the
current and alternative goals. In a second experiment, we
explored whether expectancy about the goal location was
responsible for the biasing of the saccadic endpoint. For
this, we used a condition where the saccadic goal randomly
changed from one trial to the next between locations on, above
or below the horizontal meridian. We modulated the prior
probability of the alternate-goal location by showing cues
prior to stimulus onset. The results showed that expectation
about the possible positions of the saccadic goal is suYcient
to bias saccadic endpoints and can account for at least
part of this phenomenon of ‘alternate-goal bias’.
Keywords Antisaccade · Prosaccade · Direction · Global
eVect · History · Probability
Keimyung Author(s)(Kor)
이형
Publisher
School of Medicine
Citation
Mathias Abegg et al. (2010). ‘Alternate-goal bias’ in antisaccades and the influence
of expectation. Experimental Brain Research, 203(3), 553–562. doi: 10.1007/s00221-010-2259-6
Type
Article
ISSN
0014-4819
Source
https://link.springer.com/article/10.1007%2Fs00221-010-2259-6
DOI
10.1007/s00221-010-2259-6
URI
https://kumel.medlib.dsmc.or.kr/handle/2015.oak/35724
Appears in Collections:
1. School of Medicine (의과대학) > Dept. of Neurology (신경과학)
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