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Tactile enumeration of small quantities using one hand.

Zahira Z Cohen1, Sharon Naparstek2, Avishai Henik2

  • 1Department of Psychology, Ben-Gurion University of the Negev, Beer-Sheva, Israel.

Acta Psychologica
|May 6, 2014
PubMed
Summary

This study found that people can accurately count up to four items using touch, especially when items are on nearby fingers. The right hand showed better accuracy with brief touch stimuli.

Keywords:
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Area of Science:

  • Psychology
  • Neuroscience
  • Human Factors

Background:

  • The ability to quickly and accurately enumerate small quantities, known as subitizing, is a fundamental cognitive process.
  • Investigating subitizing in the tactile modality provides insights into cross-modal sensory processing and number representation.
  • Understanding the limits and influencing factors of tactile enumeration is crucial for designing effective human-computer interactions and assistive technologies.

Purpose of the Study:

  • To explore the subitizing range for tactile stimuli presented to the fingertips.
  • To examine the influence of stimulus duration, hand laterality, and finger proximity on tactile enumeration accuracy and reaction time.
  • To determine if spatial arrangement of tactile stimuli affects the perceived number of items.

Main Methods:

  • Participants received vibro-tactile stimulation on fingertips of either the right or left hand.
  • The number of stimuli ranged from 1 to 5, presented for 100 ms or 800 ms.
  • Stimuli were applied to either neighboring or non-neighboring fingers to assess spatial effects.
  • Reaction time (RT) and accuracy were recorded for each condition.

Main Results:

  • Reaction time increased moderately up to four stimuli, then decreased for five stimuli.
  • The right hand demonstrated higher accuracy than the left hand, but only under short stimulus durations (100 ms).
  • Tactile stimuli presented to neighboring fingers resulted in higher accuracy and faster reaction times compared to non-neighboring fingers.

Conclusions:

  • The subitizing range for tactile stimuli presented to one hand appears to extend to four items, rather than the commonly cited three.
  • A right-hand advantage exists for tactile enumeration under specific conditions (short exposure).
  • The spatial arrangement of stimuli on fingers significantly impacts performance, supporting a link between numerical cognition and spatial representation in the tactile domain.