Niesha demonstrates seven different personalities that appear to take turns controlling her behavior. evidence that the same life memories are consciously experienced by all the alternate personalities would most clearly rule out the contribution of to her disorder.

dissociation

Explanation:      

Niesha is suffering from dissociative identity disorder, also referred to as DID. Earlier this disorder was known as multiple personality disorder or MPD.

This is a form of mental illness which is defined as having at least two different and enduring personality states. The DID is accompanied by forgetfulness.

A person with dissociative identity disorder may have up to 100 different personalities.

Symptoms:

1. Daydreaming.

2. Spacing out.

3. Eye glazed over.

4. Different gestures.

5. Act differently.