The two kinds of capabilities studied in psychophysics are:

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Psychophysics studies the relationship between physical stimuli and psychological responses, specifically the absolute sensitivity to stimuli (the minimum amount of stimulation needed to detect a sensory input) and sensitivity to changes in stimuli (the ability to detect differences between stimuli). The functions of the rods and cones would fall under the domain of sensory physiology, not psychophysics. The ability to organize and make sense of stimuli is more closely related to perception, which is a related but distinct field from psychophysics. The production of neurotransmitters and hormones falls under the domain of neuroscience and biochemistry, not psychophysics.

The Two Kinds of Capabilities Studied in Psychophysics Are