During the day, barb suffers from frequent, unwanted thoughts that she has left her front door unlocked and recurrent images that all her belongings have been taken. these thoughts and images are what psychologists refer to as a(n)

Obsession

Explanation:

Obsession is a psychological term. It is related to a psychological disorder. In this context of disorder, an individual experiences unwanted and repeated thought, images and sensations called obsession.  

Symptoms:

Thus in the above question Barb suffers from obsession.

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