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An "Oblique Effect" in infants' haptic perception of spatial orientations
Edouard Gentaz1, Arlette Streri
1National Center of Scientific Research (CNRS), Laboratoire Cognition et Développment, France. gentaz@psycho.univ-paris5.fr
Journal of Cognitive Neuroscience
|April 8, 2004
Summary
Five-month-old infants show a haptic oblique effect, performing better with vertical orientations than oblique ones. This suggests infants use verticality as a key reference for haptic spatial perception.
Area of Science:
- Developmental Psychology
- Haptic Perception
- Infant Sensory Processing
Background:
- The oblique effect describes superior discrimination of vertical orientations over oblique ones.
- This effect is well-documented in visual perception.
- Its presence in early haptic perception remains less understood.
Purpose of the Study:
- To investigate the oblique effect in manual haptic perception of orientations in 5-month-old infants.
- To determine if infants rely on a vertical reference for haptic spatial awareness.
Main Methods:
- Utilized a familiarization/reaction to novelty procedure.
- Assessed infants' ability to discriminate between vertical and oblique orientations using touch alone.
- Controlled for visual input during the experiment.
Main Results:
- A significant haptic oblique effect was observed in 5-month-old infants.
- Infants demonstrated better discrimination for vertical orientations compared to oblique ones.
- Findings mirror those previously seen in infant visual perception.
Conclusions:
- Five-month-old infants exhibit a haptic oblique effect.
- This suggests a predominant use of vertical orientation as a reference norm in haptic spatial perception.
- Results offer insights into early orientation processing and the neural underpinnings of haptic perception.