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The purpose of this study was to investigate the effect of age and object location on the hand selection in reaching task 120 right-handed children, adolescents and adults were selected as aur as a participant. Handedness was determined by Stanley-corn (1992) handedness Questionnaire. The tasks included lifting, reaching, and making actual use of three different objects. After the participants made 6 attempts, the objects location was changed. Each of the participants had to make 18 attempts. Data were analyzed through Two-way ANOVA and the significant level of 0/05 was used for all statistical analysis. The results showed that there is no significant difference in mean frequency of reaching in right hemi space among children, adolescence and adults (p&ge 0/05). But, there is a significant difference in the mean frequency of reaching in middle line crossing and left hemi space among children, adolescence and adulthood) p&le 0/05). The results also indicated that, Children, compared with adults and adolescents, used non-preferred hand in middle line crossing and left hemi space in reaching objects. In the same way, adults compared with adolescents, used non-dominant hand when reaching objects in middle left hemi space. So, in childhood, it is probable that the consolidation of the dominant-hand has not been established in adolescence, however, relying on dominant-hand to do the tasks increases. In adulthood, regarding the object location, tendency of using both hands, dominant- and non-dominant hands, increases.

Keywords: Object locations, preferred hand, reaching task, age gropes

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