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During reach-to-grasp movements, the hand is gradually molded to conform to the size and shape of theobject to be grasped. Yet the ability to glean information about object properties by observing graspingmovements is poorly understood. In this study, we capitalized on the effect of object size to investigatethe ability to discriminate the size of an invisible object from movement kinematics. The study consistedof 2 phases. In the first action execution phase, to assess grip scaling, we recorded and analyzedreach-to-grasp movements performed toward differently sized objects. In the second action observationphase, video clips of the corresponding movements were presented to participants in a two-alternativeforced-choice task. To probe discrimination performance over time, videos were edited to provideselective vision of different periods from 2 viewpoints. Separate analyses were conducted to determinehow the participants' ability to discriminate between stimulus alternatives (Type I sen...
Grasping others' movements: Rapid discrimination of object size from observed hand movements
D'AUSILIO, Alessandro;
2016
Abstract
During reach-to-grasp movements, the hand is gradually molded to conform to the size and shape of theobject to be grasped. Yet the ability to glean information about object properties by observing graspingmovements is poorly understood. In this study, we capitalized on the effect of object size to investigatethe ability to discriminate the size of an invisible object from movement kinematics. The study consistedof 2 phases. In the first action execution phase, to assess grip scaling, we recorded and analyzedreach-to-grasp movements performed toward differently sized objects. In the second action observationphase, video clips of the corresponding movements were presented to participants in a two-alternativeforced-choice task. To probe discrimination performance over time, videos were edited to provideselective vision of different periods from 2 viewpoints. Separate analyses were conducted to determinehow the participants' ability to discriminate between stimulus alternatives (Type I sen...I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
