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. 2002 Jan 29;99(3):1645–1650. doi: 10.1073/pnas.022638499

Figure 4.

Figure 4

Dynamic changes in SF tuning. (a) The solid curve indicates the time course of tuning of a typical V1 neuron (see Fig. 2a), the gray highlighted region shows the time window in which the neuron is responding (2 SD units around the mean of the best-fit Gaussian, as defined in the text). Filled circles represent the SF most likely to elicit a spike (i.e., the best SF) at each time slice (dashed line is the best linear fit). This cell shows an extreme change in SF tuning over time; in less than 25 ms, the best SF shifts by more than an octave from low to high SF. (Inset) Joint SF-orientation tuning at indicated latencies. (b) Distribution of SF shifts for all 52 neurons. Positive slopes indicate short latency responses to low SFs and long latency responses to high SFs (arrow indicates mean shift = +0.15 ± 0.25 cycles/degree per ms; mean ± SD). cyc, cycles.