Leonard T. Troland (1889-1932) was an American psychologist and a notable figure in the field of psychophysics, which is the study of the relationship between physical stimuli and the sensations and perceptions they produce. He is particularly recognized for his work on sensory thresholds and the principles underlying the measurement of perception. Troland introduced the concept of "Troland units," which are used to quantify the intensity of visual stimuli, particularly in the context of light perception.
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