Abstract
We investigated handedness in relation with haptic perception and not with motor ability. Habituation and novelty reaction procedure in haptic modality was used to provide evidence for indices of laterality, as early as 2 months of life. After a tactual habituation with either the left hand (lh) or right hand (rh), infants received an intramodal discrimination test performed in the same hand as the habituation, or a transfer test performed in the opposite hand. A third group received a tactual habituation with both hands. Three main results were obtained : 1 / in 2-month-old infants, habituation was observed in the Left as well as in the Right Hand ; 2 /perceptual performance differed according to the hand. Holding time was longer during the first three trials in the rh than in the lh. However, total holding time and number of trials for habituation were greater during left handling. These results provide evidence of two indications of laterality in the course of haptic habituation process : the object holding (rh > lh) and the information processing (lh > rh) ; 3 / results obtained on information transfer from one hand to the other were ambiguous.
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