The Effect of Practice with Ebbinghaus' Illusion (Large target Perception – Small Target Perception) in Field Dependence and Field Independence Individuals on a Targeting Skill Performance

The aim of present study Esfahan was to examine the effect of practice with Ebbinghaus' illusion on targeting skill performance in field dependence and field independence individuals. The Group Embedded Figure Test was distributed among 300 male students with the average age of 13.86±1.08. On the basis of the test results 60 people were divided into four groups (n=15) field independence on large target perception, field dependence on small target perception, field dependence on large target perception, field independence on small target perception groups. A pre-test was conducted to ensure that there were no differences between the groups at pre intervention time; the participants practiced marble shooting, (3×50 trials) in three sessions based on their groups. After 24 and 72 hours from the last practice session, retention and a transfer test was taken respectively. For analyzing data, two-way ANOVA and Tukey test were used. The results showed a significant difference between the main effect cognitive style on retention test and between the main effects cognitive style, visual error and the interaction effect (visual error×cognitive style) in the transfer test (P<0.05). Findings showed a significant difference between the field dependent group with the larger perceived target and the other groups (P<0.05). This study suggests that practicing with a larger perceived target for individuals who are field dependence, has a negative effect and, practicing with a smaller perceived target is an advantage for them.