Exercise 3: Neurophysiology of Nerve Impulses: Activity 6: The Action Potential: Coding for Stimulus Intensity Lab Report
Pre-lab Quiz Results
You scored 100% by answering 4 out of 4 questions correctly.
1. The time after an action potential when a second action potential cannot be generated no matter how intense the
stimulus is called the
You correctly answered: b. absolute refractory period.
2. The time after an action potential when a second action potential can be generated only if the stimulus intensity is
increased is called the
You correctly answered: c. relative refractory period.
3. The term frequency refers to
You correctly answered: c. the number of action potentials per second.
4. The purpose of this activity is to explore
You correctly answered: b. the relationship between stimulus intensity and the frequency of action potentials.
Post-lab Quiz Results
You scored 100% by answering 4 out of 4 questions correctly.
1. If the interval between action potentials (the interspike interval) is 0.1 (1/10) seconds, what frequency of action potentials
would be observed?
You correctly answered: c. 10 Hz
2. With a prolonged stimulus that is just above (more depolarized than) threshold, you would expect to get additional action
potentials when the membrane has completed
You correctly answered: b. the absolute and relative refractory periods.
3. Which of the following changes occurs when you increase the stimulus intensity?
You correctly answered: c. The frequency of action potentials increases.
4. The absolute refractory period is about 3.75 msec. What intensity stimulus would produce action potentials with this
interspike interval?
You correctly answered: d. None of these stimuli would produce action potentials at this high frequency.
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