Jeremy's mother has been humming the same tune for five minutes. Four-month-old Jeremy is nearly asleep, and his heart rate and respiration are slow. His mother switches to a different tune, and Jeremy suddenly appears to be less drowsy and he is paying more attention. What is illustrated by Jeremy's increase in attention when his mother switched tunes?
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habituation◦
sensorimotor responding◦
a conditioned response◦
dishabituation