Behavioral responses correlate with the number of ChR2 positive neurons.

<p>Each point represents a single mouse. For each behavior, we measured the correlation for all ChR2 mice (long lines, p<0.01 for each behavior), as well as only the ChR2-H or ChR2-L mice (short lines). <b>A</b>, The y-axis indicates the difference in the number of operant responses at the active versus inactive ports (averaged across days 6–9; see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0033612#pone-0033612-g002" target="_blank">Fig. 2A</a>). <b>B</b>, Head speed. <b>C</b>, Rotations. In B and C, the y-axis indicates differences between stimulation and non-stimulation periods (see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0033612#pone-0033612-g004" target="_blank">Fig. 4B,C</a>).