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Short-latency preference for faces in primate superior colliculus depends on visual cortex.

Gongchen Yu1, Leor N Katz1, Christian Quaia1

  • 1Laboratory of Sensorimotor Research, National Eye Institute, Bethesda, MD 20892, USA.

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Summary
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Scientists discovered that neurons in the macaque monkey

Keywords:
face preferencelateral geniculate nucleussuperior colliculusvisual pathways

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Area of Science:

  • Neuroscience
  • Primate Vision
  • Visual Processing

Background:

  • Face processing is crucial for primates, with research traditionally focusing on higher-order visual cortex.
  • The superior colliculus (SC) in the midbrain is involved in visual processing and eye movements.

Purpose of the Study:

  • To investigate whether neurons in the superior colliculus (SC) of macaque monkeys exhibit face-selective responses.
  • To determine the timing and pathway of early face detection in the primate visual system.

Main Methods:

  • Recorded neural activity in the superior colliculus (SC) of macaque monkeys while presenting various visual stimuli, including faces.
  • Inactivated the lateral geniculate nucleus (LGN) to assess its role in SC visual responses.
  • Analyzed the latency and accuracy of face detection at the population level.

Main Results:

  • Neurons in the macaque SC showed a preference for face images, with this preference emerging as early as 40 ms after stimulus onset.
  • Population activity in the SC could distinguish faces from other objects with approximately 80% accuracy.
  • Inactivation of the lateral geniculate nucleus (LGN) abolished visual responses in the SC, indicating reliance on early visual pathways.

Conclusions:

  • The primate midbrain superior colliculus (SC) possesses neurons that rapidly detect faces in the periphery.
  • This early face detection relies on visual input relayed through the lateral geniculate nucleus (LGN) and early visual cortex.
  • The SC provides a rapid, subcortical pathway for face detection, complementing cortical areas involved in detailed face recognition.