Figure 6

Inter-receptive-field distances.

(a) Experimental set up of stimulation and visual adaptation in relation to inter-RF distances. (b) Typical example of tuning curves of one neuron, responses normalized. The adapting site was approached in steps of 5° from 15° (RF1) — the largest distance separating both fields to the closest gap: 5° (RF3). The example shows that as the adapting field gets closer to the control receptive field, the stimulated neurons elicited larger shifts of the orientation tuning curve towards the adapter (downward red arrow). (c) Global distribution of the averaged shift-magnitudes in relation to inter-RF distances (same cells in all conditions). (d) Shift-amplitudes in adapted and non-adapted sites in relation to the original preferred orientation prior to adaptation, the broken line represents cells whose initial preferred orientation was oblique, while the solid line stands for units whose initial preferred orientations were cardinal (vertical or horizontal, see text for details). X-axis: absolute orientation differences between preferred orientation and the adapting orientation.