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Reference frame and haptic discrimination of orientations in infants
Stéphanie Kerzerho1, Arlette Streri, Edouard Gentaz
1Laboratory Cognition and Development, Université René-Descartes, Boulogne-Billancourt Cedex, France.
Neuroreport
|October 21, 2005
Summary
Infants show a haptic oblique effect in upright positions, but this disappears when their bodies are tilted. This suggests spatial orientation perception integrates both gravitational and self-centered cues.
Area of Science:
- Developmental Psychology
- Neuroscience
- Sensory Perception
Background:
- The 'oblique effect' describes enhanced perception of vertical orientations over oblique ones.
- Infants' ability to perceive spatial orientations is crucial for development.
- Understanding reference frames (gravitational vs. egocentric) is key to sensory integration.
Purpose of the Study:
- To investigate the haptic oblique effect in 5-month-old infants.
- To determine the role of body tilt and reference frames in haptic orientation discrimination.
- To explore how infants integrate gravitational and egocentric information for spatial perception.
Main Methods:
- Familiarization/reaction to novelty procedure.
- Comparison of haptic discrimination in upright versus tilted body conditions.
- Assessment of the oblique effect in infants under different postural orientations.
Main Results:
- A significant haptic oblique effect was observed in infants in the upright body position.
- The haptic oblique effect diminished or disappeared when infants' bodies were tilted.
- This indicates a change in the reference frame used for orientation perception.
Conclusions:
- Infants' perception of spatial orientations and the oblique effect are not solely based on gravity.
- A mixed reference frame, integrating both gravitational and egocentric cues, is likely utilized by infants.
- Body posture significantly influences the reference frame used in haptic spatial discrimination.