In section 2.5 of our recently published manuscript [1], we erroneously stated: “The pooled variance of all control trials was subtracted from the pooled variance of all stimulated trials. The square root of the result was taken as the measured intrinsic reflectance response, which we denote as ${\sigma }_R(t)$,” while a correct description of how the response obtained was provided in the caption of Fig. 4. The text in Section 2.5 should read: “The pooled standard deviation of all control trials was subtracted from the pooled standard deviation of all stimulated trials. The difference was taken as the measured intrinsic reflectance response, which we denote as ${\sigma }_R(t)$,”.