Sparse coding of different tuning functions in the primary visual cortex Position Eye (stereo image) Spatial frequency (scale) Orientation Direction and speed of motion Wavelength (color) Courtesy of Aapo Hyvärinen
Centre response covaries with the surround response Vanni & Rosenström, in preparation VOIcentre
Active voxels for centre are suppressed during simultaneous presentation Vanni & Rosenström, in preparation VOIcentre
Suppression (red) is surrounded by facilitation (blue) Vanni & Rosenström, in preparation
Efficient coding Response to stimulus A, A’ Response to stimulus B, B’ A’ = A – dB B’ = B – dA Barlow, H., and Földiák, P. (1989). In: The computing neuron. R. Durbin, et al., eds. (Boston, Addison-Wesley Longman Publishing Co., Inc), pp. 54-72.