Figure 5
From: The neural basis of spatial vision losses in the dysfunctional visual system
V1 Model Illustration. (a–c) Example and prediction for orientation coding and decoding. (a) Illustration of the center-surround stimulus and putative orientation hypercolumns (red circles, 
) paving it together with their lateral interactions (blue arrows, shown for only one pair of hypercolumns) (b) Top: Sample of orientation tuning curves in the model when no surround is present (solid black) and when a surround of +15 degrees is present (solid grey). Bottom: Response of the neuronal population to centre of 0 deg. and surround orientation of +15 degrees. (c) Orientation prediction of the model from the population responses for various surround orientations. In (b) and (c), the red, black and blue lines are corresponding to the three different set of parameters in the same color which were shown in (c). (d–h) Example and prediction for SF and contrast tuning coding and decoding. (d) Illustration of a low-contrast cosine grating stimulus and its paving by orientation hypercolumns (red circles, 
) and their lateral interactions (blue arrows). (e) Examples of contrast response functions in the model at few preferred SFs. Arrows depict c
1/2
where response is at half of neuron’s maximum response. (f) SF tuning examples, with the characteristic tuning width decrease with increasing preferred SF. (g) Example of the relation between c
min
, best semi-saturation constant at a given SF, and preferred SF of the neuron that follows a bell shaped function. (h) Examples of CSF prediction for two sets of model parameters.
