Objective: 

The associations among the parameters of hand, foot and eye preferences, ratio of digit lengths (2D:4D), nonverbal intelligence (IQ), hand motor skill in man and women were aimed to investigate.

Methods: 

Hand preference using 'Edinburg Hand Preference questionnaire', IQ point using 'Cattell's Culture Free Intelligence Test' and motor skill using 'Nail Movement Test'. For parameter of eye preference, the eye used for key hole were questioned, for foot preference the foot used for kicking the ball, as well as the presence of someone in the family who kicks the ball by left foot. Respective finger length from anatomic boundaries was measured using digital compass caliper and 2D:4D were calculated (at 439 volunteer participants).

Results: 

A meaningful correlation was determined between right and left hand digit ratios of participants without any gender preference. The value for motor skill was higher in women in comparison to men. In women, a positive correlation was found between right hand ratio and IQ point. On the other hand, in men, a positive correlation was found between left hand ratio and IQ point. A positive correlation between lateralization coefficient and motor skill values was also been shown in men.

Conclusions: 

Hand motor skill was higher in women than the one in men. Digit ratios were found higher in the ones having higher IQ points. This was particularly valid for different digit ratios depending on the gender. Altogether, in light of this study, it was concluded that the motor skills were higher in men who have more lateralization.