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Vertical pseudoneglect: Sensory-attentional versus action-intentional.

Benjamin A Chapin1,2, K Pisanuwongrak1,2,3,4, John B Williamson5,6,7

  • 1Division of Behavioral Neurology and Neuropsychiatry, Department of Neurology, University of Florida, Gainesville, FL, USA.

Journal of Clinical and Experimental Neuropsychology
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Summary

Healthy individuals show an upward bias in vertical-line bisection, known as altitudinal pseudoneglect. This study found that while action direction influences this bias, allocentric attention plays a primary role, with visual attention potentially following motor action.

Keywords:
Vertical bisectionaction-intentionattentionpseudoneglectvisual perception

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Area of Science:

  • Cognitive psychology
  • Neuroscience
  • Human perception

Background:

  • Healthy individuals exhibit an upward bias on the vertical-line bisection test, termed altitudinal pseudoneglect.
  • This bias is hypothesized to stem from either sensory-attentional processes or action-intentional factors.

Purpose of the Study:

  • To investigate the origins of altitudinal pseudoneglect by testing the action-intention hypothesis.
  • To determine if the direction of motor action influences the upward bias in vertical-line bisection.

Main Methods:

  • Twenty-four healthy, right-handed adults participated in a vertical-line bisection task.
  • An apparatus distinguished between sensory-attention and action-intention effects by manipulating hand movement direction (upward/downward) and marker movement congruence (congruent/incongruent) relative to hand movement.

Main Results:

  • An upward deviation from the midline was observed across all conditions.
  • Bisection responses were higher in the incongruent condition compared to the congruent condition.
  • Upward hand movements resulted in higher bisection estimates than downward movements, with no significant interaction between factors.

Conclusions:

  • Vertical pseudoneglect is predominantly driven by allocentric attention rather than action-intention.
  • Action-perceptual spatial incongruence exacerbates the upward bias, possibly due to increased attentional demands.
  • Findings suggest that visual attention may follow the direction of motor action, a factor to consider in future research.