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Inter-individual variability and consistency of saccade adaptation in oblique saccades: Amplitude increase and

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Human saccades, or rapid eye movements, adapt consistently across individuals, though the rate and extent vary. This study explored adaptation using a double step paradigm, revealing insights into sensorimotor control.

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Motor Control

Background:

  • Saccades, essential for visual exploration, demonstrate remarkable lifelong accuracy despite physical changes.
  • Sensorimotor adaptation allows saccades to adjust to errors, a process studied via paradigms like the double step.
  • Inter-individual variability in saccade adaptation requires further investigation.

Purpose of the Study:

  • To quantify inter-individual variability and consistency in saccade gain adaptation.
  • To compare adaptation rates and extents between gain increase and decrease paradigms.
  • To investigate adaptation of oblique saccades and its relation to saccade command representation.

Main Methods:

  • Four double-step paradigms (horizontal and vertical) were used with 100 participants (25 per group).
  • Each participant completed 800 trials, including baseline and recovery phases.
  • Saccade gain changes were analyzed across trials to assess adaptation.

Main Results:

  • 95% of participants showed adaptation, highlighting the phenomenon's consistency.
  • Significant inter-individual differences were found in adaptation extent and rate.
  • Adaptation rates were higher for gain decrease than increase, but final extents were similar.
  • Oblique saccade adaptation supports a vector-based representation of saccade commands.

Conclusions:

  • Saccade adaptation is a consistent sensorimotor process with substantial inter-individual variability.
  • Adaptation mechanisms appear robust across different saccade directions and gain modulations.
  • Individual saccade characteristics do not predict adaptation extent or rate.