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Are your eyes following your thoughts? Exploring individual differences in internal coupling.

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Eye movements during cognitive tasks show varied coupling with internal thoughts. While potentially compensatory for some, this coupling is also linked to mental imagery quality, suggesting complex, not fully strategic, origins.

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Area of Science:

  • Cognitive Neuroscience
  • Ophthalmology
  • Psychology

Background:

  • Eye movements often correlate with internal cognitive processes, but individual differences in this coupling are significant.
  • Understanding the variability in eye-movement coupling is crucial for predicting cognitive states and exploring its functional role.

Purpose of the Study:

  • To investigate if eye-movement coupling compensates for cognitive resource limitations or arises as a byproduct of mental imagery.
  • To examine the relationship between eye-movement coupling, working memory capacity, and mental imagery vividness.

Main Methods:

  • Assessed eye-movement coupling during a visuospatial working memory task involving imagined movement.
  • Correlated coupled saccade rates with working memory capacity (complex span tasks) and imagery skills (VVIQ, OSIVQ).

Main Results:

  • Coupled saccade rates during internal tasks varied widely (0-90%).
  • Lower working memory capacity and vividness of imagination showed some indication of benefiting from coupling, suggesting a potential compensatory role.
  • Reduced coupling was observed when visual spatial references were removed, particularly in individuals with lower spatial working memory capacity.

Conclusions:

  • Internal coupling appears partly functional and influenced by mental imagery quality, but a significant portion of individual differences remains unexplained.
  • The findings challenge the idea of a purely strategic use of internal coupling and highlight the need for further research into eye movements during cognition.