Both the main effect of stimulus duration and the main effect of masking were highly significant in both monkeys (monkey D: t duration = 41.4, p duration = 2.7·10 −93 , t mask = −14.0, p mask = 1.9·10 −30 ; monkey M: t duration = 73.0, p duration = 9.8·10 −125 , t mask = −38.6, p mask = 6.5·10 −83 ).
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