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Adaptation Properties of Macaque MT Neurons

Explore direction tuning changes in macaque MT neurons, focusing on specificity and effects on contrast gain. Findings show direction-specific adaptation in V1 with spatial and temporal frequency impact.

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Adaptation Properties of Macaque MT Neurons

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  1. Adaptation Properties of Macaque MT Neurons Adam Kohn Matt A. Smith Najib Majaj J. Anthony Movshon

  2. Questions • Change in direction tuning • Direction specificity • Transfer of adaptation in RF • Spatial specificity

  3. Specificity of V1 Adaptation Effects • Spatial Frequency • -Movshon and Lennie (1978) • -Saul and Cynader (1989) • Temporal Frequency • - Saul and Cynader (1989) • Orientation • -Muller et al. (1999) • -Dragoi et al. (2000) Dragoi et al. (2000)

  4. Test Adapt Test

  5. Preferred Flank Null

  6. Response=Rmaxcn/(cn+c50n)+base Adapt Test Test

  7. Different Patch Same Patch Proportion of Cells Ratio of Contrast Sensitivities 0.5 0.25

  8. Different Patch Same Patch Proportion of Cells Ratio of Contrast Sensitivities 0.5 0.25

  9. Conclusions • Adaptation in MT • causes a change in contrast gain • transfers across directions within the tuning curve • does not transfer across positions within the RF

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