Question

What brain mechanism enables the startle reflex to be so fast?

   What brain mechanism enables the startle reflex to be so fast?

Biological Psychology

Biological Psychology

James W. Kalat 13th Edition

Chapter 11, Problem 9

Instant Answer

Solved by Expert Aaron Hosseini

07/02/2021

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This noise is picked up by our ear, specifically the cochlea within the ear. The cochlea is responsible for picking up the sound. We can represent this as: \[ \text{Loud Noise} \rightarrow \text{Cochlea} \] Show more…

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What brain mechanism enables the startle reflex to be so fast?

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Key Concepts

Brainstem Mediation

The brainstem plays a critical role in mediating rapid reflexes, including the startle reflex. Its circuitry, particularly involving regions like the reticular formation, integrates sensory inputs and initiates immediate motor responses without needing input from higher brain centers, which keeps the reaction time extremely short.

Startle Reflex

The startle reflex is an involuntary, rapid motor response triggered by a sudden, unexpected stimulus. This reflex is essential for survival as it prepares the body for a quick reaction in potentially dangerous situations, bypassing slower, more deliberative processing pathways.

Reflex Arc

A reflex arc is a minimal neural pathway that directly connects sensory input to motor output with as few synapses as possible. By limiting the number of synaptic connections, the reflex arc greatly reduces transmission delay, enabling the quick reaction seen in the startle response.

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