everyday science MCQ #1159

Stimulus intensity is detected in the brain by:

everyday science MCQ #1159

  1. Question 1

    Q1. Stimulus intensity is detected in the brain by:

    • A) The number of action potentials per second
    • B) The threshold potential
    • C) The amplitude of the action potential
    • D) The number of synapses crossed

    Answer: The number of action potentials per second

    Explanation: The brain interprets the intensity (strength) of a stimulus by the frequency of action potentials (nerve impulses per second) arriving along sensory neurons, not by their amplitude.