Hand, eye and foot dominance

Cerebral dominance, a neurophysiological and musco-skeletal phenomenon, has been of interest to researchers for many years. Serabral dominance can be defined as the predominance of one hemisphere of the brain to the other. This dominance may be anatomical or structural. While the left hemisphere is lateralized in language, speech and computation, the right hemisphere is laterated in spatial learning and emotional communication. Lateral dominance, on the other hand, represents one of the organs in pairs, such as hands, eyes, feet and ears, which is more developed or preferred over the other. The aim of this study is to relate eye and foot dominance according to hand dominance, which is the largest representative of cerebral dominance. In addition, static posturographic (Unilateral Stance test - US) analysis aimed to reveal the effect of cerebral dominance on posture and balance - has been performed to use NeuroCom System Balance Master cerebral dominance has been done for the first time. Thirty healthy right handed and 30 left handed volunteer individuals aged between 18-45 years in Izmir were included in the study. The hand dominance of the participants was calculated and determined by the Edinburgh Hand Preference Questionnaire and the Hand Dominance Scores (EDS). Accordingly, two categories, Righter and Lefter, were created. Eye dominance and foot dominance of each candidate was determined and static posturgical test (Unilateral Stance) was performed. Statistical analysis of the data IBM SPSS Statistics 25.0 Program was used. The suitability of the numerical variables for normal distribution was examined by the Shapiro-Wilk test (n <50). Numerical variables were given as mean and standard deviation or median (min-max). Categorical variables were given as numbers and percentages. Pearson chi-square and Fisher's exact chi-square test were used for categorical variables. Independent Samples T test was used when the normal distribution was obtained for the group comparison and Mann Whitney U test was used when the normal distribution was not achieved. Statistical significance was accepted as 0.05 for all hypotheses. Female participants constituted 56.7% (n = 17) and male participants 43.3% (n = 13) in both groups. The mean age of the Lefters was 28.81.4; The mean age of the Righters was 29.30.4. The mean height of the individuals in the Lefter and Righter groups, respectively, was 171.41.8 cm and 170.71.8 cm. No statistical difference was found between the two groups in terms of gender (p = 1.00, p> 0.05), age (p = 0.80, p> 0.05) and height (p = 0.78, p> 0.05). There was a statistically significant difference in eye dominance (p = 0.04, p <0.05) and foot dominance (p = 0.00, p <0.05) between the groups. There was a statistically significant difference between foot and eye dominance (p = 0.03, p <0.05). Finally, There was no statistically signifiant difference in posturographic anaysis between the groups. As a result, the individuals selected according to handedness do not have postural asymmetry, weak eyededness and strong footedness relation to lateralization. The effect of vision on posture and balance was re-established. Further studies are needed to determine the presence of postural asymmetry and its relationship with lateral dominance. Keywords; cerebral dominance, foot dominance, static posturography