During open-brain surgery, Adam’s right foot twitched whenever the surgeon electrically stimulated a specific area within Adam’s

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Question restatement: During open-brain surgery, Adam’s right foot twitched whenever the surgeon electrically stimulated a specific area within Adam’s
Options:
- left parietal lobe.
- right frontal lobe.
- left frontal lobe.
- right parietal lobe.

Option-by-option analysis:
Option 1: left parietal lobe. The parietal lobe is primarily associated with processing sensory information (somatosensory cortex). If this region were stimulated, you would more likely expect sensory experiences (like tingling or numbness) rather than a motor twitch of the foot. Therefore this option is unlikely.

Option 2: right frontal lobe. The frontal lobe houses the motor cortex, but the right hemisphere controls the left side of the body. Stimulating the right frontal lobe would more plausibly produce movement or sensations on the left side, not the right foot. Since the observed movement is in the right foot, this makes the option inconsistent with the data.

Option 3: left frontal lobe. The left frontal lobe contains the primary motor cortex (precentral gyrus). This area governs voluntary movement on the contralateral (opposite) side of the body, so stimulating the left motor cortex would cause movement in the right side of the body, including the right foot. This matches the observed right-foot twitch, making this option the best fit given the information.

Option 4: right parietal lobe. As with option 1, the parietal lobe is mainly about sensory processing, and stimulation here would be expected to produce sensory rather than motor effects. Additionally, being in the right hemisphere would more likely affect the left side of the body, which contradicts the right-foot twitch observed in this scenario.

Underlying concept: Motor control is localized in the frontal lobe (motor cortex). The body’s right-side movements are governed by the left hemisphere’s motor areas due to contralateral control. Therefore, a twitch in the right foot from electrical stimulation points to stimulation of the left frontal lobe’s motor region, rather than the parietal lobes or the opposite hemisphere.

PSYC1101.40653.202540 Quiz 2

During open-brain surgery, Adam’s right foot twitched whenever the surgeon electrically stimulated a specific area within Adam’s

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