startle response
Học thuậtThân thiện
Definition
Noun: * A complicated involuntary reaction to a sudden unexpected stimulus (especially a loud noise); involves flexion of most skeletal muscles and a variety of visceral reactions. It is a primitive, automatic reflex designed to protect an organism by preparing it for immediate action, such as fight or flight.
Usage
The term startle response is used in scientific, medical, and psychological contexts to describe a specific, measurable physiological reflex. It is typically triggered by a sudden, intense sensory event. * It is often studied to understand neurological function, anxiety disorders, and habituation. * The phrase is commonly modified by adjectives like "acoustic," "auditory," "exaggerated," or "diminished."
Examples
- The loud crash outside the window elicited a pronounced startle response in everyone in the room.
- Researchers measured the participant's startle response by recording their eye-blink reflex to a brief, loud tone.
- Patients with post-traumatic stress disorder (PTSD) often exhibit an exaggerated startle response.
- The startle response is considered a cross-species reflex, observable in both humans and animals.
Advanced Usage
- Startle Response Modulation: This refers to the phenomenon where the magnitude of the startle response is influenced by an individual's current emotional state. For example, the response is typically larger when a person is in a fearful or anxious state compared to a pleasant state.
- Prepulse Inhibition of the Startle Response: A neurological process where a weaker, non-startling stimulus (the "prepulse") presented shortly before the startling stimulus reduces the magnitude of the startle response. This is used as a measure of sensory gating and is often impaired in certain psychiatric conditions.
Variants and Related Words
- Startle Reflex: A near-synonym often used interchangeably with startle response, though "reflex" may emphasize the more automatic, brainstem-mediated component.
- Startle (verb): To cause a sudden feeling of alarm or surprise, often triggering the startle response.
- Example: The sudden noise startled the cat.
- Startled (adjective): Describing the state of having experienced a startle.
- Example: She had a startled expression on her face.
Synonyms
- Jump reflex
- Flinch response
- Startle reaction
Related Phrases
- Acoustic startle response: A startle response specifically elicited by a sudden loud sound.
- Exaggerated startle response: A startle response that is abnormally intense or easily triggered, commonly associated with anxiety and trauma-related disorders.
Noun
- a complicated involuntary reaction to a sudden unexpected stimulus (especially a loud noise); involves flexion of most skeletal muscles and a variety of visceral reactions