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Direction selectivity in retinal bipolar cell axon terminals.

Akihiro Matsumoto1, Weaam Agbariah2, Stella Solveig Nolte1

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Direction selectivity in vision originates earlier than previously thought, at bipolar cell outputs. This tuning is refined by starburst cells and other neurons, contributing to how we perceive motion direction.

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Area of Science:

  • Neuroscience
  • Visual Processing
  • Retinal Circuitry

Background:

  • Direction selectivity is crucial for visual perception.
  • It was previously believed to originate solely in direction-selective ganglion cells (DSGCs) due to starburst cell inhibition.
  • The precise mechanisms of early visual processing remain an active area of research.

Purpose of the Study:

  • To investigate the origin of direction selectivity in the early visual pathway.
  • To determine the role of bipolar cell outputs in establishing directional tuning.
  • To elucidate the neurotransmitter systems involved in refining directional information.

Main Methods:

  • Utilized two-photon glutamate imaging to measure synaptic release.
  • Examined synaptic transmission at bipolar cell axon terminals.
  • Investigated the functional connectivity between starburst cells, amacrine cells, and DSGCs.

Main Results:

  • Direction selectivity was found to arise earlier than expected, at bipolar cell axon terminals.
  • Individual bipolar cells exhibited distinct populations of boutons tuned to specific directions.
  • Cholinergic excitation from starburst cells and GABAergic inhibition from wide-field amacrine cells were identified as key mechanisms for bouton-specific tuning.
  • DSGCs received both tuned and untuned inputs from heterogeneous bipolar cell populations.

Conclusions:

  • Directional tuning in the excitatory visual pathway is incrementally refined starting at the bipolar cell axon terminals.
  • Starburst cells contribute to directional tuning through co-release of different neurotransmitters.
  • The findings challenge previous models and highlight a more complex, multi-stage process for visual motion detection.