Figure 3.

The distribution of eccentricities. The shape of the receptive field varied from round to elongate as shown in the ratio of the major to the minor intrinsic axes of the receptive fields. The orientations of the receptive fields which met the criterion of $\frac{{\sigma }_{majoraxis}}{{\sigma }_{minoraxis}}\ge 2$ (n = 15) are presented in the inset frame.