<span>Severe depression that has a sudden onset or seems not to have any
external cause whatsoever is called major depression. Major
depression is sometimes referred to as </span>unipolar disorder or major
depressive<span> disorder (MDD); typical signs of MDD include
persistent feeling of sadness or a lack of interest in outside stimuli.</span>
<span>Responses may vary but should include some or all of the following information:Observational learning did occur. Although Kiki was not able to hit the ball, she was able to successfully replicate the behavior of swinging the bat, which means that she retained how to perform the behavior in her mind. She was also able to imitate the goal of the behavior, demonstrated by swinging the bat at the baseball instead of another target and was motivated to do it by her attempts at trying to hit the ball.</span>
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