testing models of signal integration in mt valerio mante, najib majaj, matteo carandini, j. anthony...

TESTING MODELS OF SIGNAL INTEGRATION IN MT

Valerio Mante, Najib Majaj, Matteo Carandini, J. Anthony Movshon

ETH and University of ZurichHoward Hughes Medical Institute and New York University

Gratings and plaids

Models of MT direction selectivity

SH pattern model

(Simoncelli and Heeger 1998)

Component model

(Movshon et al. 1983)

Abstract Pattern model

(Movshon et al. 1983)

The stimuli and their velocities

Responses of three MT cells

Component model

Abstract pattern model

SH pattern model

SH pattern model cells sum the outputof the appropriate V1 cells

The direction tuning of SH pattern model cellsfor slow gratings is bimodal

Comparisonof the modelsfor the 3 cells

Comparisonof the modelsfor 39 cells

Conclusions

To fit our data, we extended the original abstract component and pattern models and simplified the SH pattern model.

Overall, the SH pattern model and the abstract pattern model performed equally well. But the SH model has fewer free parameters.

The SH pattern model predicts some properties that are not explained by the other two.