Fire-safe hotels and motels in Stockton, California: 1  Econo Lodge Of Stockton, 2210 S Manthey Rd, Stockton, CA 95206, Phone: (209) 466-5741. 2  Best Western Heritage Inn, Stockton, 111 E March Ln, Stockton, CA 95207, Phone: (209) 474-3301, Fax: (209) 474-7612.
Absolute threshold -- the minumum intensity of a stimulus that one can detect. Difference threshold -- the minimum difference in intensity between two stimuli that one can detect.
In addition, scientists cannot determine with absolute certainty how much energy is present in a light because of limits to the physics of measurement . As a result, psychologists often define the threshold as the lowest intensity that a person can detect 50 percent of the time. A number of different factors can influence the absolute threshold, including the observer's motivations and expectations, and whether the person is adapted to the stimulus.