Affect is the experience of feeling or emotion. Affect is a key part of the process of an organism's interaction with stimuli. The word also refers sometimes to affect display, which is "a facial, vocal, or gestural behavior that serves as an indicator of affect" (APA 2006).The affective domain represents one of the three divisions described in modern psychology: the cognitive, the conative, and the affective. Classically, these divisions have also been referred to as the "ABC of psychology",[citation needed] in that case using the terms "affect", "behavior", and "cognition". In certain views, the cognitive may be considered as a part of the affective,[citation needed] or the affective as a part of the cognitive.[citation needed]Affective states are considered psycho-physiological constructs and are split up into three main categories: valence, arousal, and motivational intensity. Valence is the positive-to-negative evaluation of the subjectively experienced state. Emotional valence is defined as referring to the emotion’s consequences, eliciting circumstances, or subjective feel or attitude. Arousal is by the activation of the sympathetic nervous system and can be measured subjectively. Arousal is a construct that is closely related to motivational intensity but they differ because motivation requires action implications while arousal does not. Motivational intensity refers to impulsion to act. It is the strength of urge to move toward or away from a stimulus. Simply moving is not considered approach motivation without a motivational urge present. All three of these categories are important when looking at the effect of affective states on cognitive scope. Initially, it was thought that positive affects broadened cognitive scope whereas negative affects narrowed cognitive scope. However, evidence now suggests that affects high in motivational intensity narrow cognitive scope whereas affects low in motivational intensity broaden cognitive scope. The cognitive scope has indeed proven to be a highly effective cognitive approach.