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Visual field asymmetries in numerosity processing.

Ramakrishna Chakravarthi1, Danai Papadaki2, Jan Krajnik2

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|October 18, 2022
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Summary
This summary is machine-generated.

Enumeration abilities, including subitizing and estimation, show visual field asymmetries. Performance varies across horizontal and vertical meridians, suggesting influences from early visual processing and attention.

Keywords:
AttentionCrowdingEnumerationEstimationSubitizingVisual field asymmetry

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Area of Science:

  • Cognitive Neuroscience
  • Visual Perception
  • Human Factors

Background:

  • Humans possess distinct abilities for enumerating small (subitizing) versus large (estimation) quantities of objects.
  • Both subitizing and estimation are spatial processes that extract information across locations.
  • The influence of visual field location on these enumeration processes remains largely unexplored.

Purpose of the Study:

  • To investigate whether enumeration abilities exhibit spatial asymmetries across the visual field.
  • To determine how object spacing affects enumeration performance at different visual field locations.
  • To explore potential links between visual field asymmetries in enumeration and underlying visual processing mechanisms.

Main Methods:

  • Two experiments were conducted to assess enumeration performance (subitizing and estimation) at various peripheral visual field locations.
  • Experiment 1 manipulated object spacing at cardinal and non-cardinal peripheral locations.
  • Experiment 2 focused on cardinal locations, minimizing crowding effects to isolate meridian-specific performance.

Main Results:

  • A Horizontal-Vertical Asymmetry (HVA) was consistently observed, with superior performance along the horizontal compared to the vertical axis.
  • This HVA was modulated by object spacing, becoming more pronounced with closer spacing.
  • Additional asymmetries included a Vertical Meridian Asymmetry (VMA; lower > upper) and a Horizontal Meridian Asymmetry (HMA; left > right), present in both subitizing and estimation.

Conclusions:

  • Enumeration processes exhibit significant spatial asymmetries across the visual field, including HVA, VMA, and HMA.
  • The findings suggest that enumeration may be influenced by both low-level visual constraints (potentially explaining HVA and VMA) and higher-level attentional mechanisms (potentially explaining HMA).
  • Visual attention appears to play a role in both subitizing and estimation, contributing to observed spatial performance variations.