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Subliminal perception refers to the processing of sensory information that occurs below the level of conscious awareness. Researchers study subliminal perception by presenting a stimulus, such as a word or image, very quickly, typically around 50 milliseconds. This rapid presentation is often followed by another stimulus, such as a pattern of dots or lines, which blocks further mental processing of the initial stimulus. As a result, if participants cannot identify the initial stimulus better...
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Creating Objects and Object Categories for Studying Perception and Perceptual Learning
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Pointing perception is precise.

S M Cooney1, N Brady1, A McKinney1

  • 1School of Psychology, University College Dublin, Belfield, Dublin 4, Ireland.

Cognition
|May 1, 2018
PubMed
Summary
This summary is machine-generated.

Human pointing is a precise cognitive skill. Our study reveals that people can accurately discern where someone is pointing, even with limited visual cues, highlighting the importance of pointing in communication and cognition.

Keywords:
GazeHandsJoint attentionPerceptionPointing

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Area of Science:

  • Cognitive Science
  • Neuroscience
  • Human Perception

Background:

  • Pointing is a fundamental human gesture crucial for cognitive development and communication.
  • Early pointing in infancy predicts language acquisition and shared intentionality.
  • Despite its significance, research on the perception of pointing and its referents is limited.

Purpose of the Study:

  • To investigate the perceptual acuity for discerning the direction of a human point.
  • To understand how spatial location and pointing hand influence pointing perception.
  • To determine the impact of visual occlusion and embodiment cues on pointing accuracy.

Main Methods:

  • Experimentally measured perceptual thresholds for discerning pointing direction.
  • Varied referent location, hand used, and visual conditions (eye occlusion, embodiment cues).
  • Utilized precise measurements of visual angle at interpersonal distances.

Main Results:

  • Perceptual acuity for pointing is remarkably accurate, with thresholds as low as 0.5° visual angle at ~2m.
  • Accuracy is modulated by the referent's spatial location and the hand used for pointing.
  • Pointing perception remained accurate even when the pointer's eyes were occluded or embodiment cues were altered.

Conclusions:

  • The human capacity to perceive pointing direction is highly precise.
  • The morphology of the arm, hand, and finger contributes to accurate attention guidance.
  • Pointing is a sophisticated communicative gesture that precisely directs attention in space.