Unit quiz: Sensation, action, regulation, and the measurement of brain activity

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5 questions · 80% to pass · no timer. This quiz checks the lessons in this unit. These authored questions assess recognition and application of the taught distinctions, not professional qualification. You may review the lessons and retry. Repeat attempts reuse the question bank; a remembered answer is not proof of transfer to a new situation.

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Question 1

A sustained innocuous pressure fades from awareness while a sustained noxious stimulus can become more noticeable with repetition. Which comparison explains the difference?Different afferent classes with different response dynamics: touch afferents adapt and emphasize change, while nociceptive afferents can sensitize.Both pathways adapt, but the nociceptive pathway is recruited from a larger population of receptors so it feels stronger.

Question 2

A reaching movement overshoots the target on first attempt but converges over repeated trials, and the pattern disappears after damage to a cerebellar module. What is the most defensible description?The module stores the memory of the target location, which is why removing it removes the ability to reach the target.The module contributes to error-based adaptation of the movement, with the repeated-trial convergence as the adaptation measure.

Question 3

A person's blood pressure is within the usual range, but cardiac output measured at the same visit is twenty percent below earlier values. What does the relation among pressure, output, and resistance imply?Resistance has likely risen substantially, so normal pressure conceals a changed balance among its determinants.The pressure reading must be mistaken, because a fall in cardiac output always lowers arterial pressure.

Question 4

A scalp recording shows a 200-millisecond separation between two components, and the authors use it to argue that the later component originates in a deeper structure. Which part of the inference is the weak link?The latency step, because scalp electrodes cannot measure intervals shorter than about half a second.The anatomical step, because surface signals require solving an underdetermined inverse problem and source depth is not fixed by latency order.

Question 5

A region shows greater BOLD signal during a task, and a separate group of patients with damage to the same region is impaired on that task. What does the combination support that either result alone does not?A correlate of the task in that region together with evidence that the region is needed for it under the tested conditions.A complete account of the mechanism, because correlation plus necessity together identify the neural code.

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