The haptic perception affords detection of the physical and functional properties of an instrument actively sustained.Fifty-seven children(8.82±0.38 years old)and 64 elderlies(71.3±4.46 years old)estimated t...The haptic perception affords detection of the physical and functional properties of an instrument actively sustained.Fifty-seven children(8.82±0.38 years old)and 64 elderlies(71.3±4.46 years old)estimated the length and the distance of the center of percussion for two table tennis rackets and a badminton racket.The eigenvalues of each racket for length and distance from the wrist to the center of percussion were calculated.The present study confirmed the results obtained with field tennis rackets,extending them to table tennis and badminton rackets,and also to children.The elderlies preserved and children had the capacity of haptically detect physical and functional properties of table tennis and badminton rackets.The weight of the rackets affected properties estimations.The eigenvalues may be a valid tool for the definition of physical and functional properties of sport instruments,allowing better adjustment to different motor development stages.展开更多
Babies react to changes in the characteristics of objects,presenting haptic recognition after a period of familiarization.We aimed to verify if infants responded to the different spatial orientations of an ergonomic p...Babies react to changes in the characteristics of objects,presenting haptic recognition after a period of familiarization.We aimed to verify if infants responded to the different spatial orientations of an ergonomic pacifier in the mouth.With informed consent,10 babies(271.6±60.8 days),users of ergonomic pacifiers,revealed motor behaviors that were divisible into three categories,sometimes through successive actions(i.e.,perception-action cycles were present):(i)repositioned correctly the pacifier,through different modes;(ii)repositioned it,but incorrectly,through different modes;and(iii)rejected the pacifier.So,these babies detected the incorrect position of the pacifier,and acted according to the principle of motor equivalence,since they implemented variations of a solution for the same need.展开更多
文摘The haptic perception affords detection of the physical and functional properties of an instrument actively sustained.Fifty-seven children(8.82±0.38 years old)and 64 elderlies(71.3±4.46 years old)estimated the length and the distance of the center of percussion for two table tennis rackets and a badminton racket.The eigenvalues of each racket for length and distance from the wrist to the center of percussion were calculated.The present study confirmed the results obtained with field tennis rackets,extending them to table tennis and badminton rackets,and also to children.The elderlies preserved and children had the capacity of haptically detect physical and functional properties of table tennis and badminton rackets.The weight of the rackets affected properties estimations.The eigenvalues may be a valid tool for the definition of physical and functional properties of sport instruments,allowing better adjustment to different motor development stages.
文摘Babies react to changes in the characteristics of objects,presenting haptic recognition after a period of familiarization.We aimed to verify if infants responded to the different spatial orientations of an ergonomic pacifier in the mouth.With informed consent,10 babies(271.6±60.8 days),users of ergonomic pacifiers,revealed motor behaviors that were divisible into three categories,sometimes through successive actions(i.e.,perception-action cycles were present):(i)repositioned correctly the pacifier,through different modes;(ii)repositioned it,but incorrectly,through different modes;and(iii)rejected the pacifier.So,these babies detected the incorrect position of the pacifier,and acted according to the principle of motor equivalence,since they implemented variations of a solution for the same need.
