Visual Latency - Reaction Time

Purpose

To demonstrate visual latency.

Equipment

Meter stick

Images

o2-14

Description

A meter stick is held by one person directly above the hands of a second person, the victim. When the meter stick is dropped, the victim closes its hands to catch the meter stick. The reaction time T of the victim can be calculated as T=SQRT(2S/g), where g is the acceleration of gravity and S is the distance the meter stick has fallen. ◙◙The experiment is then repeated with the room darkened. Typically the meter stick will fall considerably further, due to the longer reaction time in a darkened environment. The increased time, due to visual latency, can be determined by subtracting the reactio

References

William Schnippert, Catch a Dollar Bill, TPT 14, 177, (1976).