What is the definition of perception (al-idrāk) in Islamic law, and does a lack of perception mean that a person does not know what they are saying or what is happening around them?

"Idrak" linguistically is the verbal noun of "adraka" (to perceive/comprehend). It is used to refer to the maturity of a boy or a girl, catching up, the maturation of an animal or fruit, and seeing. As for its meaning among the jurists, it refers to reaching puberty or the age of maturity.