Mounting evidence indicates that in healthy older adults, predict(s) decrements in reaction time and other cognitive abilities.

Mounting evidence indicates that in healthy older adults, Mylenin breakdown predict(s) decrements in reaction time and other cognitive abilities.

Explanation:

According to one view, aging is accompanied by withering of the myelin coating on neural fibers within the cerebral cortex, leading to deteriorating neural connections, especially in the prefrontal cortex and the corpus callosum. Mounting evidence indicates that in healthy older adults, extent of myelin breakdown—appearing as small, high-intensity bright spots within fMRIs—predicts decrements in reaction time and other cognitive abilities.

answer; /// i believe its the cochlea;