The prototype model of forming concepts is creating a mental image of the average features.
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Prototype theory is a mode of graded categorization in cognitive science. The statement that the prototype model of forming concepts is creating a mental image of the average features is true. This  mental image of average characteristics used to see if other objects match it.

a problem could be dealing witj emotional stress..all of these factors contribute to emotional stress.

answer; /// i believe its the cochlea;