Startle response
Startle Response
The Startle Response (pronunciation: /ˈstɑːrtl rɪˈspɒns/), also known as the Startle Reflex, is a rapid, involuntary reaction to a sudden or unexpected stimulus, such as a loud noise or sudden movement.
Etymology
The term "startle" originates from the Old English word "styrtan", meaning "to jump up", and the term "response" comes from the Latin "responsus", meaning "an answer".
Definition
The Startle Response is a defensive response to sudden or threatening stimuli. It's often characterized by involuntary jumping, blinking, or flinching. The response is thought to be a basic form of defense mechanism that prepares the body for fight or flight.
Physiology
The Startle Response is primarily mediated by the reticular formation in the brainstem, which receives sensory input and sends signals to the facial and skeletal muscles. The response is typically characterized by a sequence of muscle contractions beginning with the facial muscles and followed by the skeletal muscles.
Related Terms
- Fight or Flight Response: A physiological reaction that occurs in response to a perceived harmful event, attack, or threat to survival.
- Reticular Formation: A set of interconnected nuclei that are located throughout the brainstem.
- Reflex: An action that is performed as a response to a stimulus and without conscious thought.
See Also
External links
- Medical encyclopedia article on Startle response
- Wikipedia's article - Startle response
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