Final answer:
Psychophysics in psychology studies how physical stimuli influence sensory perceptions and mental states.
Explanation:
Psychophysics is the branch of psychology that focuses on studying the effects of physical stimuli on sensory perceptions and mental states. Psychophysicists investigate concepts such as the absolute threshold of sensation and the difference threshold, adhering to Weber's law, which states that the difference threshold is a constant proportion of the original stimulus intensity.
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