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Related Experiment Video

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A Method to Quantify Visual Information Processing in Children Using Eye Tracking
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Preattentive Processing of Numerical Visual Information.

Philipp N Hesse1, Constanze Schmitt1, Steffen Klingenhoefer2

  • 1Department of Neurophysics, Philipps-Universität Marburg Marburg, Germany.

Frontiers in Human Neuroscience
|March 7, 2017
PubMed
Summary

Subitizing, the rapid perception of small numbers (1-4 items), is preattentive. This study used EEG to show that visual numerical information processing in the subitizing range occurs even when attention is diverted.

Keywords:
numberpreattentivesubitizing-rangevMMNvisual mismatch negativity

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Area of Science:

  • Cognitive Neuroscience
  • Visual Perception
  • Numerical Cognition

Background:

  • Subitizing allows rapid and accurate judgments of small numerosities (typically 1-4 items).
  • Its speed and ease have led to the assumption of preattentive processing, similar to basic visual features.
  • Recent research suggests subitizing may depend on attentional resources, challenging this assumption.

Purpose of the Study:

  • To investigate the preattentive nature of visual numerical perception within the subitizing range.
  • To determine if numerical information is processed automatically, independent of focused attention.

Main Methods:

  • Electroencephalography (EEG) was used to record brain activity.
  • Participants performed a demanding, attention-drawing task at the fixation point.
  • Peripheral, task-irrelevant sequences of visual stimuli with varying numerosities were presented.

Main Results:

  • Significant visual mismatch negativity (vMMN) responses were observed over parieto-occipital electrodes.
  • Event-related potential (ERP) and time-frequency analysis (TFA) revealed concurrent increases in evoked theta power.
  • These neural responses indicate automatic processing of numerical information.

Conclusions:

  • The findings provide strong evidence for preattentive processing of visual numerical information in the subitizing range.
  • Numerical perception in this range appears to occur automatically, even under conditions of divided attention.
  • This supports the view that subitizing is a fundamental, low-level perceptual ability.