Functional somatic syndromes refer to syndromes that marked by the symptoms, suffering, and disability it causes rather than by any demonstrable tissue abnormality.

Functional systems is defined as a concept which was first formulated by Luria in which behavior results from interaction among many areas of the brain.

Functional theory of group decision making refers to a conceptual analysis of the steps or processes that groups generally follow when making a decision, with a focus on the intended purpose of each step or process in the overall decision-making sequence.

Functional tolerance refers to the decreased behavioral effects of a drug as a result of its regular use

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Functional-equivalence hypothesis refers to belief that although visual imagery is not identical to visual perception, it is functionally equivalent to it

Functionalism is a term in the Psychology of Language that refers to the theory that the structure of language has a basis in the communicative functions language serves.

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A functionalist refers to someone who adheres to the principles of functionalism, a psychological theory that emerged in the late 19th century. Functionalism focuses on understanding the Purpose and function of human thoughts, feelings, and behaviors within the context of adaptation to the environment. This theory has had a significant influence on psychology and has implications for various aspects of human behavior and mental processes. In this article, we will explore the concept of functionalism, provide examples, discuss potential risks and application areas, offer recommendations, delve into historical and legal aspects, and list some related psychological theories.

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Functionalist perspective (on emotions) refers to a theory specifying the major purpose of an emotion is to establish, maintain, or change one’s relationship with the environment to accomplish a goal ; emotions are not viewed as discrete early in life but as entities that emerge with age