Selective Attention Test Selective Attention Test from Simons & Chabris (1999) Instructions: Count how many times the players wearing white pass the basketball. How many passes did you count? The correct answer is 15 passes. But did you see the gorilla?! This video is from research by Daniel Simons and Christopher Chabris ©1999, Daniel J. Simons, all rights reserved. It is available for use in talks, training, and teaching on DVDs from Viscog Productions. www.viscog.com. Learn more at www.theinvisiblegorilla.com