When the brain is doing work, Self-Reinforcing Networks𓇯 send pulses to each other. At the concrete level, it's all individual neurons sending roughly 1-bit pulses to other neurons. An "event" is an abstraction of that in which the networks send arbitrarily complex data structures to each other.
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I'm following Lisa Feldman Barrett» here. The reason for the word "event" is to emphasize that the neural pulses that comprise an event happen over time, not (as a computer metaphor would have it) the atomic delivery of a data structure at the tick of some global clock.
Rather, neural pulses arrive asynchronously over some period of time. I visualize that as the receiving network having a sub-network responsible for building the event data one bit at a time. At some point, enough data has come in that the sub-network says, "I'm calling it: I've gotten an event of type *X* with content *Y*." Then the containing network acts on that event.
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