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Chapter 7: Problem 3

A surgeon places an electrode on a portion of your brain and stimulates it. Immediately, your right wrist involuntarily twitches. The doctor has most likely stimulated a portion of the______________ area of your brain.

Short Answer

Expert verified
The doctor has most likely stimulated a portion of the motor cortex area of the brain.

Step by step solution

01

Identify the Principle

The principle being tested here is whether or not we understand that the brain controls the movements of our body parts. When a certain area of the brain is stimulated, it can cause an associated body part to move.
02

Critical Analysis of the Question

The question states, the right wrist twitched when a specific area in the brain was stimulated, which shows that this part of the brain controls movements of the right hand.
03

Relate the Information with Known Facts about Brain

Based on neuroscience, we know that the left hemisphere of the brain controls the movements of the right side of the body and vice versa. Therefore, the part of the brain that was stimulated must be located in the left hemisphere.
04

Identify the Brain Area

The part of the brain that controls movement is the motor cortex. Given that the example involves movement of the right hand, the doctor must have stimulated the motor cortex in the left hemisphere of the brain.

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Most popular questions from this chapter

Match the portion of the brain with its function: a. medulla b. pons c. cerebellum d. reticular formation 1\. Maintains breathing and heartbeat. 2\. Controls bodily balance. 3\. Coordinates and integrates muscle movements. 4\. Activates other parts of the brain to produce general bodily arousal.

Match the name of each brain scan with the appropriate description: a. EEG b. fMRI c. PET 1\. By locating radiation within the brain, a computer can provide a striking picture of brain activity. 2\. Electrodes placed around the skull record the electrical signals transmitted through the brain. 3\. This technique provides a threedimensional view of the brain by aiming a magnetic field at the body.

Nonverbal realms, such as emotions and music, are controlled primarily by the ______________ hemisphere of the brain, whereas the ______________ hemisphere is more responsible for speaking and reading.
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