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Sex differences in line bisection as a function of hand.

Markus Hausmann1, Gökce Ergun, Yanki Yazgan

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Sex and hand use interact in visual line bisection, influencing pseudoneglect. Females show a consistent left bias with both hands, while males exhibit it mainly with their left hand.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Human Behavior

Background:

  • Pseudoneglect, a leftward bias in visual line bisection, is often linked to right-hemispheric activation.
  • Few studies have explored the influence of sex on pseudoneglect, with most finding no significant main effect.
  • The interaction between sex and motor factors like hand use in line bisection remains underexplored.

Purpose of the Study:

  • To investigate the interaction between sex and hand use in the phenomenon of pseudoneglect.
  • To examine how line position influences left bias in visual line bisection and its interaction with sex and hand use.

Main Methods:

  • A visual line bisection task was administered to right-handed male and female participants.
  • The study analyzed the effect of hand used (left vs. right) and line position (left, middle, right) on the degree of leftward bias.

Main Results:

  • A significant interaction was found between sex and hand use, with females exhibiting a similar left bias using either hand, whereas males showed a stronger bias with the left hand.
  • Line position significantly affected left bias and interacted with hand use.
  • Females demonstrated a more pronounced leftward bias compared to males, particularly when using their right hand.

Conclusions:

  • The findings suggest that sex and hand dominance interact to modulate pseudoneglect.
  • Differences in interhemispheric connectivity, potentially related to corpus callosum size, may underlie sex-specific patterns of visuospatial and motor activation.
  • These results highlight the complexity of factors influencing spatial biases and their neural underpinnings.