Advance information modulates the global effect even without instruction on where to look

Frouke Hermens, Tandra Ghose, Johan Wagemans

Research output: Contribution to journalArticle

Abstract

When observers are asked to make an eye movement to a visual target in the presence of a near distractor, their eyes tend to land on a position in between the target and the distractor, an effect known as the global effect. While it was initially believed that the global effect is a mandatory eye movement strategy, recent studies have shown that explicit instructions to make an eye movement to a certain part of the scene can overrule the effect. We here investigate whether such top–down influences are also found when people are not actively involved in an explicit eye movement task, but instead, make eye movements in the service of another task. Participants were presented with arrays of yellow and green discs, each containing a letter, and were asked to identify a target letter. Because the discs were presented away from fixation, participants made an eye movement to the array of discs on most of the trials. An analysis of the landing sites of these eye movements revealed that, even without an explicit instruction, observers take the advance information about the colour of the disc containing the target into account before moving their eyes. Moreover, when asking participants to maintain fixation for intervals of different durations, it was found that the implicit top–down influences operated on a very similar time-scale as previously observed for explicit eye movement instructions.
Original languageEnglish
Pages (from-to)639-648
Number of pages10
JournalExperimental Brain Research
Volume226
Issue number4
Early online date8 Apr 2013
DOIs
Publication statusPublished - May 2013

Fingerprint

Eye Movements
Color

Keywords

  • eye movements
  • global effect
  • saccade landing sites

Cite this

Advance information modulates the global effect even without instruction on where to look. / Hermens, Frouke; Ghose, Tandra; Wagemans, Johan.

In: Experimental Brain Research, Vol. 226, No. 4, 05.2013, p. 639-648.

Research output: Contribution to journalArticle

Hermens, Frouke ; Ghose, Tandra ; Wagemans, Johan. / Advance information modulates the global effect even without instruction on where to look. In: Experimental Brain Research. 2013 ; Vol. 226, No. 4. pp. 639-648.
@article{5661714bf82544b59fa8f7130780029b,
title = "Advance information modulates the global effect even without instruction on where to look",
abstract = "When observers are asked to make an eye movement to a visual target in the presence of a near distractor, their eyes tend to land on a position in between the target and the distractor, an effect known as the global effect. While it was initially believed that the global effect is a mandatory eye movement strategy, recent studies have shown that explicit instructions to make an eye movement to a certain part of the scene can overrule the effect. We here investigate whether such top–down influences are also found when people are not actively involved in an explicit eye movement task, but instead, make eye movements in the service of another task. Participants were presented with arrays of yellow and green discs, each containing a letter, and were asked to identify a target letter. Because the discs were presented away from fixation, participants made an eye movement to the array of discs on most of the trials. An analysis of the landing sites of these eye movements revealed that, even without an explicit instruction, observers take the advance information about the colour of the disc containing the target into account before moving their eyes. Moreover, when asking participants to maintain fixation for intervals of different durations, it was found that the implicit top–down influences operated on a very similar time-scale as previously observed for explicit eye movement instructions.",
keywords = "eye movements, global effect, saccade landing sites",
author = "Frouke Hermens and Tandra Ghose and Johan Wagemans",
year = "2013",
month = "5",
doi = "10.1007/s00221-013-3480-x",
language = "English",
volume = "226",
pages = "639--648",
journal = "Experimental Brain Research",
issn = "0014-4819",
publisher = "Springer Verlag",
number = "4",

}

TY - JOUR

T1 - Advance information modulates the global effect even without instruction on where to look

AU - Hermens, Frouke

AU - Ghose, Tandra

AU - Wagemans, Johan

PY - 2013/5

Y1 - 2013/5

N2 - When observers are asked to make an eye movement to a visual target in the presence of a near distractor, their eyes tend to land on a position in between the target and the distractor, an effect known as the global effect. While it was initially believed that the global effect is a mandatory eye movement strategy, recent studies have shown that explicit instructions to make an eye movement to a certain part of the scene can overrule the effect. We here investigate whether such top–down influences are also found when people are not actively involved in an explicit eye movement task, but instead, make eye movements in the service of another task. Participants were presented with arrays of yellow and green discs, each containing a letter, and were asked to identify a target letter. Because the discs were presented away from fixation, participants made an eye movement to the array of discs on most of the trials. An analysis of the landing sites of these eye movements revealed that, even without an explicit instruction, observers take the advance information about the colour of the disc containing the target into account before moving their eyes. Moreover, when asking participants to maintain fixation for intervals of different durations, it was found that the implicit top–down influences operated on a very similar time-scale as previously observed for explicit eye movement instructions.

AB - When observers are asked to make an eye movement to a visual target in the presence of a near distractor, their eyes tend to land on a position in between the target and the distractor, an effect known as the global effect. While it was initially believed that the global effect is a mandatory eye movement strategy, recent studies have shown that explicit instructions to make an eye movement to a certain part of the scene can overrule the effect. We here investigate whether such top–down influences are also found when people are not actively involved in an explicit eye movement task, but instead, make eye movements in the service of another task. Participants were presented with arrays of yellow and green discs, each containing a letter, and were asked to identify a target letter. Because the discs were presented away from fixation, participants made an eye movement to the array of discs on most of the trials. An analysis of the landing sites of these eye movements revealed that, even without an explicit instruction, observers take the advance information about the colour of the disc containing the target into account before moving their eyes. Moreover, when asking participants to maintain fixation for intervals of different durations, it was found that the implicit top–down influences operated on a very similar time-scale as previously observed for explicit eye movement instructions.

KW - eye movements

KW - global effect

KW - saccade landing sites

U2 - 10.1007/s00221-013-3480-x

DO - 10.1007/s00221-013-3480-x

M3 - Article

VL - 226

SP - 639

EP - 648

JO - Experimental Brain Research

JF - Experimental Brain Research

SN - 0014-4819

IS - 4

ER -