Hard and fast rules about the body: contributions of the action stream to judging body space |
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Authors: | Hach Sylvia Ishihara Masami Keller Peter E Schütz-Bosbach Simone |
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Institution: | (1) Max Planck Institute for Human Cognitive and Brain Sciences, Stephanstr. 1a, 04103 Leipzig, Germany;(2) Tokyo Metropolitan University, Tokyo, Japan |
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Abstract: | Analogously to the visual system, somatosensory processing may be segregated into two streams, with the body constituting
either part of the action system or a perceptual object. Experimental studies with participants free from neurological disease
which test this hypothesis are rare, however. The present study explored the contributions of the two putative streams to
a task that requires participants to estimate the spatial properties of their own body. Two manipulations from the visuospatial
literature were included. First, participants were required to point either backward towards pre-defined landmarks on their
own body (egocentric reference frame) or to a forward projection of their own body (allocentric representation). Second, a
manipulation of movement mode was included, requiring participants to perform pointing movements either immediately, or after
a fixed delay, following instruction. Results show that accessing an allocentric representation of one’s own body results
in performance changes. Specifically, the spatial bias shown to exist for body space when pointing backward at one’s own body
disappears when participants are requested to mentally project their body to a pre-defined location in front space. Conversely,
delayed execution of pointing movements does not result in performance changes. Altogether, these findings provide support
for a constrained dual stream hypothesis of somatosensory processing and are the first to show similarities in the processing
of body space and peripersonal space. |
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