This is an improved
form of maze learning in which error committed can be objectively known.
The apparatus has a wooden box. The top of the box has rows and columns of nail
heads fixed. The nails are connected to a stylus, a speaker and a bulb. The subject
is asked to trace the right path while moving the stylus through the nail
heads. If going a wrong path the bulb will glow and a beep will be heard.
