Discrimination of objects that are necessary for survival (such as appropriate food) as well as emotional awareness and expression involves the .

amygdala.

Explanation:

Okay, let us first fill in the gap from the question above. Note that the capitalized word is the word to fill the missing gap.

''Discrimination of objects that are necessary for survival (such as appropriate food) as well as emotional awareness and expression involves the AMYGDALA''.

Amygdala is a cluster of neurons that can be found in the brain and has its main function in the control of emotions such as anger and fear and so on. The amygdala, cingulate gyrus and hyppocampus all belong to the same kind of system because all of the three are associated with Emotional control and things like that, the system which is known as the Limbic system is used to group the three structures mentioned above.