A Study On Visual Illusion

955 Words4 Pages
This study was all over visual illusion. The experimenters wanted to figure out if rhesus or capuchin monkeys saw the “Delboeuf Illusion” in the same perception as humans do. In experiment one, the task was to choose the larger of two dots, which sometimes had rings around them. Humans had evidence of the illusion, yet the monkeys did not. In experiment two, the two groups were required to classify a dot by its size: small or large. The “Delboeuf illusion” was found in both species this time. In the first experiment, the participants consisted of Nonhuman primates that were from the Language Research Center of Georgia State University in Atlanta, Georgia. The monkeys had access to water and daily diets of fruits, vegetables, and primate…show more content…
Monkeys were free from restraints during testing, and sat around thirty centimeters from the computer screen. When the test began, correct responses resulted into banana-flavored pellet rewards. Humans were tested almost exactly just as the monkeys, but for their correct answers, they did not receive food, but they received positive feedback on accuracy appeared their computer screen. The stimuli, which were the rings and dots, were black and had a white background. A central target size was created to be on every trial, which was level seven. There was a range of thirteen possible dots that were compared to the level seven dot. Dots one through six were smaller, while dots eight through thirteen were larger. It was easier for participants to discriminate between the dots that were further away from each other numerically, but dots, such as level six and seven were very close together in size. Smaller or larger rings went around the circles of the targeted dots. In diameter, smaller rings were four and a half centimeters, and larger rings were nine centimeters. During the tests, participants had to distinguish between the larger or smaller dots. Two stimuli appeared on the screen, sometimes having a ring around the dot. Participants had to click on a stimuli within three seconds or the computer screen would go blank. When successfully clicking the larger dot, it would result in either a chime and reward, but when incorrectly clicking the smaller dot, a twenty
Open Document