Splitting motivation: unilateral effects of subliminal incentives.
Motivation is generally understood to denote the strength of a person's desire to attain a goal. Here we challenge this view of motivation as a person-level concept, in a study that targeted subliminal incentives to only one half of the human brain. Participants in the study squeezed a handgrip to win the greatest fraction possible of each subliminal incentive, which materialized as a coin image flashed in one visual hemifield. Motivation effects (i.e., more force exerted when the incentive was higher) were observed only for the hand controlled by the stimulated brain hemisphere. These results show that in the absence of conscious control, one brain hemisphere, and hence one side of the body, can be motivated independently of the other.
Institut du Cerveau et de la Moelle épinière, Paris, France.
Liane
L
Schmidt
Stefano
S
Palminteri
Gilles
G
Lafargue
Mathias
M
Pessiglione
D000328:Adult; D005260:Female; D007839:Functional Laterality; D018737:Hand Strength; D006801:Humans; D008297:Male; D009042:Motivation / Q000502:physiology*; D010775:Photic Stimulation / Q000379:methods; D011597:Psychomotor Performance / Q000502:physiology; D012201:Reward; D013360:Subliminal Stimulation; D055815:Young Adult