The negative effect of group recall on memory is known as collaborative where the same number of individuals working together recall fewer items than they would on their own.

The correct answer is collaborative inhibition.

Collaborative inhibition refers to the phenomenon wherein a group has poor memory recall compared to when individual group members work on their own. Collaborative inhibition is caused because by listening to others' inputs and having discussions, each group member's individual and unique memory retrieval tools are disrupted. 

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