highly significantP < 0.001
Although most neurons that encoded stimulus did not encode context (524 of 597), the fraction that did or that exhibited an interaction was still highly significant in two-sided binomial tests: out of the 597 neurons with a main effect of stimulus, 73 also showed a main effect of question with P < 0.001 (12.23%; P < 2.225 × 10 −308 ) and 31 an interaction with P < 0.001 (5.19%; P < 2.225 × 10 −308 ).