highly significantp < 10 −12
The MUA response to visual stimuli (median 0.1 SD above baseline) was not significantly different from 0 (sign-rank test p = 0.6), while the responses to auditory (median 2.7 SD) and audio–visual stimuli (median 1.6 SD) were highly significant (sign-rank tests, p < 10 −12 and p < 10 −9 ).