"Affect" is as an action or verb, affect means to change, and usually refers to an emotion or symptom. Affected, when used in a description, refers to fake or intentionally assumed behavior (a changed behavior), i.e., an affected accent. Affect can refer to facial expression or demeanor.
As a noun, "affect" may refer to an emotion or to a psychological/psychiatric state (see below). As an adjective, it may refer to an assumed pretense: "Her affected accent really had an effect on me"; "Her affected* accent really affected* my view of her". (* Notice that both uses of Affected* are actions).
Affect may refer to:
Blunted affect or affective flattening, a reduction in emotional reactivity.,
Labile affect, the unstable display of emotion.,
Affect display, signs of emotion, such as facial expression, vocalization, and posture,
Affective science, the scientific study of emotion,
Affect (linguistics), the grammar of expressing affect,
Affective computing, an area of research in computer science aiming to understand the emotional state of users,
Affekt, a German term often used in musical and other aesthetic theory
Doctrine of the affections, an important theory in the aesthetics of music,