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Adaptation Properties of Macaque
MT Neurons
Adam Kohn
Matt A. Smith
Najib Majaj
J. Anthony Movshon
Questions
• Change in direction tuning– Direction specificity
• Transfer of adaptation in RF– Spatial specificity
Dragoi et al. (2000)
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)
TestTest Adapt
Pre
ferr
edF
lan
kN
ull
Response=Rmaxcn/(cn+c50n)+base
TestAdaptTest
Pro
po
rtio
n o
f C
ells
Ratio of Contrast Sensitivities
Different Patch Same Patch
0.5
0.25
Ratio of Contrast Sensitivities
Pro
po
rtio
n o
f C
ells
0.5
0.25
Different Patch Same Patch
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