Card Sorting Tray

The apparatus demonstrates the phenomenon of Habit Interference with the underlying fact that time taken to accomplish a practiced task is less than time taken to accomplish a new task. The apparatus consists of a tray with many numbered boxes and number indicating cards according to the number of boxes. Work to be done is to make the subject place the numbered cards in the same numbered box. Different situations can be created like the number of the boxes is in serial order or the number of the boxes can be jumbled. Or the subject is made to use right hand first and then left hand. Time taken in different situations is recorded.