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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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The brain processes sensory information rapidly due to parallel processing, which involves sending data across multiple neural pathways at the same time. This method allows the brain to manage various sensory qualities, such as shapes, colors, movements, and locations, all concurrently. For instance, when observing a forest landscape, the brain simultaneously processes the movement of leaves, the shapes of trees, the depth between them, and the various shades of green. This enables a quick and...
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Encoding of 3D physical dimensions by face-selective cortical neurons.

Amit P Khandhadia1, Aidan P Murphy2, Kenji W Koyano1

  • 1Section on Cognitive Neurophysiology and Imaging, Laboratory of Neuropsychology, National Institute of Mental Health, NIH, Bethesda, MD 20892.

Proceedings of the National Academy of Sciences of the United States of America
|February 21, 2023
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Neurons in the primate brain process object size based on real-world dimensions, not just retinal image size. This suggests the visual system performs geometric analysis of physical objects.

Keywords:
face processinginferior temporal cortexmacaquenaturalistic behaviorvisual objects

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Primate Cognition

Background:

  • Neurons in the primate inferior temporal (IT) cortex selectively respond to complex visual objects like faces.
  • Neuronal responses are often size-dependent, but whether this reflects retinal image size or real-world object geometry is debated.

Purpose of the Study:

  • To investigate whether neurons in the macaque anterior fundus (AF) face patch encode the physical size (in centimeters) or the angular subtense (in degrees) of faces.
  • To understand the role of the ventral visual pathway in object representation and geometric analysis.

Main Methods:

  • Used a macaque avatar to stereoscopically render 3D photorealistic faces at various sizes and distances.
  • Presented stimuli to macaques while recording neuronal activity in the AF face patch.
  • Manipulated size and distance to create conditions where faces had identical retinal image projections but different physical sizes.

Main Results:

  • Most AF neurons were primarily modulated by the 3D physical size of the faces, not their 2D angular size on the retina.
  • Neuronal responses showed a graded encoding of physical size, with strongest responses to extremely large and small faces.

Conclusions:

  • Face-selective neurons in the primate IT cortex encode the real-world physical size of objects.
  • Category-selective regions of the ventral visual pathway are involved in geometric analysis of objects, going beyond simple retinal image processing.