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Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings
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Linking structure and function: development of lateral spatial interactions in macaque monkeys.

Da-Peng Li1, Maureen A Hagan1, Lynne Kiorpes1

  • 1Center for Neural Science, New York University, New York, New York.

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Summary
This summary is machine-generated.

Suppressive visual interactions mature early in infant macaques, remaining stable postnatally. Facilitation, however, develops gradually over the first year, suggesting a cognitive origin rather than primary visual cortex development.

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Area of Science:

  • Neuroscience
  • Developmental Neuroscience
  • Visual Perception

Background:

  • Lateral spatial interactions are fundamental to visual processing, influencing performance through enhancement or degradation.
  • The neural underpinnings of these interactions, particularly suppression and facilitation, remain debated, with hypotheses involving local inhibition, long-range projections, and uncertainty reduction.

Purpose of the Study:

  • To investigate the developmental trajectories of lateral spatial interactions (suppression and facilitation) in infant macaques.
  • To compare these developmental profiles with potential underlying neural mechanisms in the visual system.

Main Methods:

  • A lateral masking paradigm was employed to assess visual performance in infant macaques.
  • The study included animals aged from 10 weeks to 3 years.

Main Results:

  • Suppressive interactions were present from early postnatal life and showed no significant changes across the tested age range.
  • Facilitatory interactions exhibited a slow developmental progression, maturing over the first year after birth.

Conclusions:

  • Early maturation of suppressive interactions correlates with mature receptive field properties in early visual cortical areas of infant macaques.
  • The delayed maturation of facilitation suggests it originates from later-developing feedback or top-down cognitive processes, rather than local or long-range connectivity in the primary visual cortex.