Published online by Cambridge University Press: 24 October 2025
The idea that activation decay is intimately involved in human temporality is pursued more formally. A close analysis of what kind of thing activation is and how it might decay is conducted through an examination of decay rate equations. A case is made that the rate equation for the negative exponential best captures the notion of activation decay that is implicated in priming and time-based grouping. This leads to a focus on the one parameter that defines the negative exponential, the activation lifetime. The activation lifetime is identified as a kind of valve that regulates the flow of information into the mind. The question that animates the remainder of the book is posed: What aspect of the body, mind, or environment sets the value of the activation lifetime?
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