Table 1.
Classification of cells after adaptation.
Figure 1.
Typical example of an attractive shift.
Twenty-five presentations of each orientation. Gaussian fits and orientation are normalized in this and other figures: optimal orientation is marked zero. Vertical broken lines indicate optimal orientations. Downward arrowhead indicates adapting orientation in this and all figures. Horizontal Right inserts show spike waveforms recorded during each phase of the recordings. Bar equals 1.6 ms.
Figure 2.
Three examples of orientation shifts.
From left to right (A) attractive, (B) repulsive and (C) no shift. Upper row: Raw data, error bars indicate SEM. Bottom row: Gaussian fits, same cells as in the upper row.
Figure 3.
Distribution of orientation-class preference and shift magnitude significance.
(A) Neurons divided into five orientation classes of 18°. Vertical and horizontal orientations dominate (that is cardinal orientations). (B) The relationship between shift-magnitude and significance level indicates that cardinal orientations have larger shift than cells whose orientation is oblique.
Figure 4.
Example of a neuron untuned to orientation.
Prior to adaptation (in blue) no orientation evokes a stronger response. Following adaptation (in red) a clear optimal orientation emerges. Right inserts, tracing 1 and 2 show spike waveforms recorded during each phase of the recordings, bar equals 2.16 ms. Tracings in 3 illustrates PSTHs of evoked responses prior to (upper) and following (lower) adaptation respectively.
Figure 5.
Comparative response modulations induced by adaptation.
Upper row: repulsive shifts. Lower row: attractive shifts. Three responses are computed: Original preferred, responses to adapter, new preferred. Star indicates significant level p<0.05. Abbreviations, Ori: orientation, Ctrl: control, Adapt: adaptation