Lateral differences in schematic face encoding during dual-task performance with increasing levels of difficulty

Area of Science:

• Cognitive Neuroscience
• Neuropsychology
• Human Motor Control

Background:

• Hemispheric lateralization of cognitive functions is a key area in neuroscience.
• The role of the right hemisphere in facial encoding and the 'functional cerebral distance principle' require further investigation.
• Understanding interhemispheric interactions during concurrent cognitive and motor tasks is crucial.

Purpose of the Study:

• To investigate the role of the right hemisphere in facial encoding in right-handed adults.
• To test the 'functional cerebral distance principle' regarding hemispheric interference.
• To examine the effects of concurrent verbal production and face encoding on unimanual finger tapping.

Main Methods:

• Twenty normal, right-handed, familial dextral males performed unimanual finger tapping, face encoding (varying difficulty), and verbal production tasks.
• Concurrent tasks included tapping with verbal production and tapping with face encoding.
• Subsequent face recognition accuracy was assessed following concurrent tasks.

Main Results:

• Concurrent left-hand tapping significantly disrupted subsequent face recognition more than right-hand tapping.
• No significant asymmetric interference was observed in tapping rate or variability due to verbal production or face encoding.
• Increased task difficulty led to decreased tapping rate variability, suggesting attentional or motor programming influences.

Conclusions:

• Findings support the hypothesis of right-hemisphere mediation for facial encoding in adults.
• Results align with the 'functional cerebral distance principle', indicating greater interference when tasks engage closer or the same hemisphere.
• Attention and automatic motor programming likely influence motor control variability during demanding cognitive tasks.