Suzana Herculano-Houzel

Behavior is any observable action

We usually equate nervous systems with behaviors, but as it turns out, a nervous system – that is, an ensemble of organs and tissues made of excitable cells that carry signals rapidly across the body – is actually not necessary for behavior. If behavior is defined simply as sets of observable actions in a given context, then plants have behaviors, like orienting to sunlight; so do single-cell…...

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