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Allocentric visual cues influence mental transformation of bodies
Nora Preuss1, Laurence R Harris, Fred W Mast
1Department of Psychology, University of Bern, Switzerland.
Journal of Vision
|October 18, 2013
Summary
Understanding body orientation involves mental rotation and spatial projection. Aligned visual cues improved body identification but not hand identification, suggesting allocentric cues influence egocentric mental transformations.
Area of Science:
- Cognitive Neuroscience
- Human Perception
- Embodiment Studies
Background:
- Human body stimulus identification relies on motoric and spatial embodiment processes.
- These processes interact and may reveal underlying reference frames.
- The allocentric visual reference frame influences perceived body orientation relative to gravity.
Purpose of the Study:
- To investigate how allocentric visual cues affect spatial and motoric embodiment.
- To determine if environmental orientation influences the identification of body and hand stimuli.
- To explore the interplay between external reference frames and egocentric mental transformations.
Main Methods:
- Utilized the York Tumbling Room to manipulate allocentric visual reference frames.
- Participants (N=16) judged body and hand stimuli at various orientations.
- Manipulated room orientation relative to gravity and stimulus orientation relative to the participant.
Main Results:
- Body stimuli identification accuracy improved when room and body stimulus orientations were aligned.
- Congruent orientations did not enhance hand stimuli identification.
- Reaction times for identifying either stimulus type were independent of room orientation.
Conclusions:
- Static allocentric visual cues can modulate embodiment and performance in egocentric mental transformation tasks.
- The intrinsic visual polarity of body stimuli, unlike hands, may explain differential effects.
- Environmental orientation plays a role in body-specific spatial representation but not in general reaction speed.
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