Mental process (such as seeing, hearing, or smelling) due to immediate bodily stimulation, usually as distinguished from perception. When a stimulus impinges on a sense organ and the organism responds, it is said that the stimulus has been sensed. Seealso psychophysics, sense-data.
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In psychology, sensation is the first stage in the biochemical and neurologic events that begins with the impinging of a stimulus upon the receptor cells of a sensory organ, which then leads to perception, the mental state that is reflected in statements like "I see a uniformly blue wall." In other words, sensations are the first stages in the functioning of senses.
Also according to Rozelle, “The sensation of what something feels like is used to describe everything from sensual pleasure to pain and torture. It’s a wide range, and your readers have actually experienced only some of those feelings. So your job is to either make them recall exactly what it feels like when something occurs in your story or, if they haven’t experienced it, what it would feel like if they did” . Morrell describes a “sensory surround,” which when “coupled with drama tugs the reader into [the] story and forces him to keep reading.”