parafovea

The cell distributions estimated from the data suggested that the neurons in the fovea tends to prefer higher spatial frequency than in the parafovea, which is consistent to the physiological insight in animal cortex.

PLoS ONE Alerts: New Articles Satohiro Tajima et al. 2010

It has not been explained by previously proposed computational frameworks why there is such a qualitative disparity between the fovea and the parafovea, and why the sensitivity in the parafovea forms an N-shaped curve Empirically and theoretically obtained thresholds for discriminating falloff parameters

PLoS ONE Alerts: New Articles Satohiro Tajima et al. 2010

The inset figures show the spatial frequency tuning curves of each of seven neurons, illustrating the difference in the distributions of the peak preferred frequencies between the fovea and the parafovea.

PLoS ONE Alerts: New Articles Satohiro Tajima et al. 2010

For the parafovea, the discrimination threshold peaks at a small whereas no peak is observed for foveal presentation, as the data show in

PLoS ONE Alerts: New Articles Satohiro Tajima et al. 2010

Distribution of neurons explains fovea-parafovea difference

PLoS ONE Alerts: New Articles Satohiro Tajima et al. 2010

The model parameters were set to be the same for both conditions except that the fovea had a broader distribution of the unit's preferred spatial frequency, covering a relatively higher frequency domain than the parafovea; this assumption is in qualitative agreement with an electrophysiological study that intensively investigated the spatial frequency selectivity of Macaque striate cells with various loci of receptive fields

PLoS ONE Alerts: New Articles Satohiro Tajima et al. 2010

To get an intuitive understanding of how the qualitative difference between the fovea and the parafovea arises in the model, it is illustrative to follow the process by which the Fisher information is derived from the Figure 3 depicts the procedure for computing the Fisher information from the neuronal tuning curves.

PLoS ONE Alerts: New Articles Satohiro Tajima et al. 2010

We have found that the expected fovea-parafovea difference in the cell distribution over the preferred spatial frequency would cause a qualitative disparity among the psychophysical skills in the fovea and the parafovea, which was not demonstrated previously.

PLoS ONE Alerts: New Articles Satohiro Tajima et al. 2010

The model explains the reported qualitative and quantitative differences in human performance between the fovea and the parafovea.

PLoS ONE Alerts: New Articles Satohiro Tajima et al. 2010

The panels a-c and d-f in the figure show the cases for the fovea and the parafovea, respectively.

PLoS ONE Alerts: New Articles Satohiro Tajima et al. 2010