Figure 7.

Control experiments for effects on locomotor activity and differences in amount of light delivered. a, Optical stimulation at 11 or 30 Hz had no effect on locomotor activity (n = 5). b, Controlling for total light between 11 and 30 Hz conditions by compensating with pulse widths did not affect differential exploration (n = 6 for each condition). For both experiments, the DR = (time exploring in 30 Hz condition − time exploring in the 11 Hz condition)/(time exploring in 30 Hz condition + time exploring in the 11 Hz condition). The bar on the left shows the DR when pulses are 8 ms for both conditions. The bar on the right shows the DR when 30 Hz pulses are 4 ms and 11 Hz pulses are 12 ms. Data are means ± normalized SEM. ##p < 0.01, significant difference from zero, p < 0.05 (t test).