Participants were presented with a pair of large colored squares, one on the left and the other on the right side of the screen. In each phase, the participants were instructed to choose as quickly as possible which of the 2 squares was a particular color.

Computer-generated scenes containing a red pillar were presented. Participants were instructed to imagine viewing the scene from the vantage point of the red pillar. Four alternative views of the scene were shown as choices

comprises 3 levels of information processing load: single digits, 2-digit arithmetic problems.For each of the 3 levels, stimuli were presented at 3 different fixed rates, incrementally increasing as testing continues.

Participants had to "catch" a rectangular white object falling vertically from the top of the screen before it reached the bottom of the screen. Pressing on the mouse button moved a rectangular green "paddle" horizontally so that it could be positioned directly in the path of the falling object. The test required hand-eye coordination, scanning, and rapid responses

Pictorial puzzles of gradually increasing difficulty were presented. Each puzzle consisted of a 2 · 2 array containing 3 black and white line drawings and a missing element. Participants had to choose the best fit for the fourth (missing) element of the puzzle from among 6 possible alternatives.