adapt

there is a stimulus and a response.

the first time, the response is full. the neuron fires at maximum rate. the signal registers clearly: this is new information. the organism attends to it.

on the second exposure, the response is slightly smaller. the brain has received this signal once — it isn't predicting anything novel or dangerous. the pathway begins to deprioritize.

this is habituation: the diminishing neural response to a repeated stimulus. it occurs at every level of the nervous system, from the simplest reflex arc to the most complex cortical processing. the animal learns: this isn't news. attention is a finite resource. allocate it to what is actually changing.

habituation is not forgetting. the stimulus still arrives. the encoding still happens. somewhere in the processing hierarchy, the signal is caught and filtered before it reaches you. the experience of novelty doesn't survive repetition. the capacity for response doesn't diminish — only the access to it.

you can't reverse this by deciding to pay more attention. the filtering runs before the decision does.

you have now read this page.

when you return, there will be nothing here.

not because the server changes it.

because you already read it.