Emotions are complex psychophysical
processes that evoke positive or negative psychological
responses (or both) and physical expressions, often
involuntary.
Emotions are often related to
feelings, perceptions or beliefs about elements, objects or
relations between them, in reality or in the imagination.
They typically arise spontaneously,
rather than through conscious effort.
An emotion (reaction or state) is
often differentiated from a feeling (sensation or
impression), although the word feeling can mean emotion in
some contexts.