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Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.
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More than a feeling: Tactile exploration informs relative size perception.

Jennifer Stevens1

  • 18604William & Mary, USA.

Perception
|July 7, 2022
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Tactile exploration can teach the brain about relative object size, similar to vision. This finding helps explain how blind individuals perceive spatial dimensions and create art.

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3D perceptionblindnessdepthhaptics/touchscene perception

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Area of Science:

  • Cognitive Neuroscience
  • Haptic Perception
  • Artistic Rendering

Background:

  • Blind painter Esref Armagan's use of line structure and tactile exploration-induced visual cortex activation are known.
  • However, how blind individuals understand visual depth cues like relative size remains unclear.

Purpose of the Study:

  • To investigate if tactile experience provides information about relative size.
  • To explore the haptic perception of spatial dimensions.

Main Methods:

  • Sighted participants were blindfolded and explored objects in near and far locations via touch.
  • Participants then drew the explored objects.

Main Results:

  • Objects explored at a distance (arms extended) were drawn significantly smaller than those explored up close.
  • This indicates haptic interaction provides relative size information.

Conclusions:

  • Haptic object interaction offers insights into relative size, comparable to visual input.
  • This can inform spatial layout understanding and artistic representation of three-dimensional objects for individuals like Esref Armagan.