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Precise visual tasks, like searching, require synergistic eye and body movements, particularly involving the head. Adding a cognitive load, such as counting, enhances these coordinated movements for better task performance.

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Area of Science:

  • Human movement science
  • Neuroscience
  • Visual perception

Background:

  • Eye and body movements are crucial for visual tasks.
  • Understanding the interplay between eye and body coordination is essential for optimizing visual performance.

Purpose of the Study:

  • To investigate the functional relationship between eye and body movements during precise visual tasks.
  • To examine the influence of an additional cognitive task (counting) on these movement relationships.
  • To test a model predicting negative correlations between eye and body movements in search tasks.

Main Methods:

  • 16 healthy young adults performed visual tasks (searching, free-viewing, gaze-fixation) with and without a silent counting task.
  • Eye movements, body (center of pressure, head, neck, lower back) movements, and subjective cognitive involvement were recorded.
  • Correlations between different movement types were analyzed.

Main Results:

  • Negative correlations between eye and body movements, primarily eye and head, were found in search tasks, confirming hypotheses.
  • The double search-counting task increased the number of these negative correlations.
  • Higher subjective cognitive involvement in search tasks was significantly related to movement correlations.

Conclusions:

  • Precise visual tasks necessitate synergistic control of eye and body movements by the brain.
  • Cognitive load enhances the coordination between eye and body movements.
  • The findings support a model where integrated movement control is vital for complex visual tasks.