But I brought this example because it is particularly clear there's no math, no transformation of the data to convince you that there is a reactivation so it goes like this: this is the sonogram of a zebra-finch's song the animal was singing syilables here, this is time, this is frequency, and the brightness is the power of the vocalization, this is one syilable another one, another one, another one and a small one, OK? something very sexy for female zebra-finches like "meh-meh-meh", this is what they're singing 