Reflex: A reflex is an involuntary response that occurs in response to a specific stimulus. It involves the activation of sensory neurons that send signals directly to motor neurons, bypassing the brain.
Unconditioned Response (UR): An unconditioned response is an involuntary reaction that occurs naturally in response to an unconditioned stimulus (UCS), without any prior learning.
Instinct: Instinct refers to innate behaviors that are biologically programmed and do not require any learning. These behaviors are present from birth and are essential for survival and adaptation.