Fig. 13.

(a)–(d) Upper panels: stimuli used for eccentricity experiment. Lower panels: group average HRF obtained with the sparse array indicated in Fig. 1(e). The thick lines indicate the mean $\mathrm{\Delta }\mathrm{HbO}$, $\mathrm{\Delta }\mathrm{HbR}$, and $\mathrm{\Delta }\mathrm{HbT}$ across all repetitions, and the shaded bands indicate the standard deviation. (e)–(h) and (i)–(l) Group average $\mathrm{\Delta }\mathrm{HbO}$ and $\mathrm{\Delta }\mathrm{HbR}$ across all sessions for each condition, respectively. (m)–(p) and (q)–(t) Overlap of activations $\mathrm{\Delta }\mathrm{HbO}$ and $\mathrm{\Delta }\mathrm{HbR}$ for each condition.