Neurologically Caused Loss of Ability to Speak

Puzzle 9 of Yoga Hard Pack

Question is: Neurologically Caused Loss of Ability to Speak

and the answer is: APHASIA

Word Meaning:

APHASIA — (pathology) A partial or total loss of language skills due to brain damage. Usually, damage to the left perisylvian region, including Broca's area and Wernicke's area, causes aphasia.

Definitions from Wiktionary.