Footedness of left- and right-handers

Area of Science:

• Neuroscience
• Human Motor Control
• Cognitive Psychology

Background:

• Handedness, the preference for using one hand over the other, is a well-documented human trait.
• The relationship between hand preference and foot preference (footedness) is complex and varies between individuals.
• Understanding laterality in motor tasks can provide insights into brain organization and genetic influences.

Purpose of the Study:

• To investigate the relationship between handedness and footedness using a simple tapping task.
• To compare the motor performance differences between left- and right-handers in both hands and feet.
• To evaluate how these findings align with existing theories of handedness, such as Annett's modified genetic theory.

Main Methods:

• Participants performed a simple tapping task to assess motor speed and dexterity.
• Performance was measured for both the left and right hands and feet.
• Subjects were categorized as either right-handed or left-handed based on their hand preference.

Main Results:

• Right-handers demonstrated faster tapping speeds with their right hand and right foot.
• Left-handers exhibited faster tapping speeds with their left hand and right foot.
• Left-handers showed less pronounced left-right performance differences in both hand and foot tapping compared to right-handers.

Conclusions:

• Footedness appears to directly follow handedness in right-handers.
• This direct correspondence is not observed in left-handers, indicating a different pattern of lateralization.
• The observed patterns of hand and foot performance in relation to handedness offer support for Annett's modified genetic theory of handedness.