Figure 2.

(a) Channels displaying statistically significant (p < 0.05) group average [HbO] changes during visual stimulation are indicated by red dots. The optical array is visualized over the head of a juvenile grey seal to show the anatomical perspective of regional activation. (b) Corresponding group average (lines) and standard error (ribbons) changes in [HbO], [HbR] and [HbT] over 15 s of visual stimulation (shaded grey area) followed by 15 s of no visual stimulation (white area). Bold colours represent a significant (p < 0.05) change in [HbO] and where [HbO] and [HbR] were negatively correlated.