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Related Experiment Video

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Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity
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Saccade latency indexes exogenous and endogenous object-based attention.

Gözde Şentürk1, Adam S Greenberg2, Taosheng Liu3

  • 1Department of Psychology, Michigan State University, 316 Physics Rd, East Lansing, MI, 48824, USA.

Attention, Perception & Psychophysics
|May 27, 2016
PubMed
Summary

Object-based attention effects are observable in eye movements (saccades), not just reaction times. Saccade latencies provide a more sensitive measure of attentional selection than traditional keypress responses.

Keywords:
Eye movementsObject-based attentionVisual attention

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Oculomotor Research

Background:

  • Traditional object-based attention studies rely on reaction time (RT) measures.
  • Saccades (eye movements) are crucial for object fixation, yet their link to object-based attention is less understood.
  • Attention may function differently during covert (without eye movement) versus overt (with eye movement) deployment.

Purpose of the Study:

  • To investigate if object-based attentional effects are present in saccade planning.
  • To compare the sensitivity of saccade latencies versus RTs in measuring attentional effects.
  • To examine the influence of different cue types (hybrid, exogenous, endogenous) on attention and saccades.

Main Methods:

  • Adapted the Egly et al. (1994) double-rectangle paradigm.
  • Measured both first saccade latency and keypress reaction time (RT) to target stimuli.
  • Utilized hybrid, exogenous, and endogenous cueing conditions.

Main Results:

  • Both RTs and saccade latencies showed space-based and object-based attentional selection.
  • Saccade latencies were more sensitive to attentional modulation than RTs.
  • Exogenous cues revealed spatial inhibition of return and object-based effects, suggesting independence.

Conclusions:

  • Object-based attention has an oculomotor correlate, influencing saccade planning.
  • Object-level priority, alongside spatial priority, impacts eye movement generation.
  • Saccade latencies offer a robust measure for studying attentional selection mechanisms.