Mental chronometry
Strength of stimulus

In addition to stimulus intensity, varying stimulus strength (that is, "amount" of stimulus available to the sensory apparatus per unit time) can also be achieved by increasing both the area and duration of the presented stimulus in an RT task. This effect was documented in early research for response times to sense of taste by varying the area over taste buds for detection of a taste stimulus, and for the size of visual stimuli as amount of area in the visual field. Similarly, increasing the duration of a stimulus available in a reaction time task was found to produce slightly faster reaction times to visual and auditory stimuli, though these effects tend to be small and are largely consequent of the sensitivity to sensory receptors.
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