the biological model assumes some aberration in bodily functions to be the causes of most, if not all, mental illnesses, including depression. the biological model seeks to understand the relationship between brain structures and functions and ensuing thoughts, feelings. and behaviors and is associated with pharmacological treatment. medications play a crucial role in managing and treating depressive illnesses. group can be helpful in addressing issues of medication management, such as education regarding side effects and noncompliance. however, biological functions cannot be compartmentalized from human emotions, thoughts, and behaviors; all reciprocally affect each other and can be examined in counseling and therapy groups.