every time it thunders, susan's dog (who totally panics) jumps up on susan and scratches her legs. after this happens a lot, susan begins wincing/bracing herself every time she hears thunder. after susan's dog dies, susan now hears thunder all the time, without being assaulted/scratched by her panicked dog. eventually she no longer winces/braces herself at the sound of thunder. this is best explained by:



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