Authors: Fukui T, Inui T.
Title: How vision affects kinematic properties of pantomimed prehension
Journal(書誌情報): Frontiers in Psychology
doi: 10.3389/fpsyg.2013.00044
When performing the reach-to-grasp movement, fingers open wider than the
size of a target object and then stop opening. The recorded peak grip
aperture (PGA) is significantly larger when this action is performed
without vision during the movement than with vision, presumably due to
an error margin that is retained in order to avoid collision with the
object. People can also pretend this action based on an internal target
representation (i.e., pantomimed prehension), and previous studies have
shown that kinematic differences exist between natural and pantomimed
prehension. These differences are regarded as a reflection of variations
in information processing in the brain through the dorsal and ventral
streams. Pantomimed action is thought to be mediated by the ventral
stream. This implies that visual information during the movement, which
is essential to the dorsal stream, has little effect on the kinematic
properties of pantomimed prehension. We investigated whether an online
view of the external world affects pantomimed grasping, and more
specifically, whether the dorsal stream is involved in its execution.
Participants gazed at a target object and were then subjected to a 3-s
visual occlusion, during which time the experimenter removed the object.
The participants were then required to pretend to make a reach-to-grasp
action toward the location where the object had been presented. Two
visual conditions (full vision and no vision) were imposed during the
pantomimed action by manipulating shutter goggles. The PGA showed
significant differences between the two visual conditions, whereas no
significant difference was noted for terminal grip aperture, which was
recorded at the movement end. This suggests the involvement of the
dorsal stream in pantomimed action and implies that pantomimed
prehension is a good probe for revealing the mechanism of interaction
between the ventral and dorsal streams, which is also linked to embodied
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