Demonstration of the Pulfrich Effect

The Pendulum Swing

Instructions

The participant is seated comfortably. The participant is given a pair of dark glasses with one of the lens punched out (Figure 3.). The intact lens acts as an nuetral density filter. The participant is told to put the dark glasses on and told to face and focus on the screen. The screen is put at the eye level of the participant. On the screen, a pandulum is shown to be swinging from left to right repeatedly. After a short period of time, the participant will experience the pulfrich effect.

Figure 3. Dark Glasses with one lens punched out.