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In the late nineteenth century,immigrants in the United States
Freezing Response
A behavioral reaction to a threatening stimulus characterized by immobility and the cessation of all movement, considered a survival mechanism.
Conditioned Emotional Response
The ability of a conditioned stimulus (CS) to elicit emotional reactions as a result of the association of the CS with a painful event.
Hyperactivity
A condition characterized by abnormal levels of activity, impulsivity, and difficulty maintaining attention, often associated with Attention Deficit Hyperactivity Disorder (ADHD).
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