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Paying attention to saccadic intrusions.

E Gowen1, R V Abadi, E Poliakoff

  • 1Behavioural Brain Sciences, School of Psychology, Hills Building, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK. e.gowen@bham.ac.uk

Brain Research. Cognitive Brain Research
|November 1, 2005
PubMed
Summary

Physiological saccadic intrusions (SI), small eye movements during fixation, are linked to endogenous attention mechanisms. These findings suggest SI reflect attention shifts and could help study cortical control of fixation.

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Cognitive Psychology

Background:

  • Physiological conjugate saccadic intrusions (SI) are common, small eye movements during visual fixation.
  • The underlying causes and attentional relationships of SI remain unclear.

Purpose of the Study:

  • To investigate the relationship between saccadic intrusions (SI) and attentional processes.
  • To determine if SI are influenced by exogenous (stimulus-driven) or endogenous (goal-directed) attention.

Main Methods:

  • Manipulated target viewing conditions (presence, servo control, background, size) and attentional states (passive vs. active fixation, instruction changes).
  • Assessed effects of exogenous attention using a cue-target task with button press or saccade responses.
  • Measured SI amplitude, duration, frequency, and direction in human subjects.

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Main Results:

  • SI amplitude increased when targets were absent; SI frequency decreased under open-loop conditions.
  • Target size and background influenced SI idiosyncratically, with trends for reduced SI frequency/amplitude with patterned backgrounds and larger targets.
  • SI frequency decreased during passive and active fixation tasks.
  • Exogenous cue-target tasks did not influence SI direction.

Conclusions:

  • Saccadic intrusions (SI) are primarily related to endogenous attention mechanisms, not exogenous ones.
  • SI may represent endogenous attention shifts reflecting a baseline attention state during fixation.
  • SI could serve as a tool for exploring higher cortical control of visual fixation.