The following questions refer to the figure below of a sagittal, T1-weighted MRI of the heart. 
-Which line points to the right atrium?
Definitions:
Discriminative Stimulus
A stimulus in the environment that signals the availability of reinforcement or punishment, guiding behavior accordingly.
Negative Reinforcement
A behavior modification technique that involves the removal of an unpleasant stimulus after a desired behavior is exhibited, making the behavior more likely to happen in the future.
Punishment
A consequence that decreases the likelihood of a behavior being repeated.
People's Response
The reactions or responses provided by individuals or groups to various stimuli or situations.
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