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Infants' Visual Recognition of Pincer Grip Emerges Between 9 and 12 Months of Age
Irene Senna1,2, Margaret Addabbo2, Nadia Bolognini2,3
1Cognitive Neuroscience Department and Cognitive Interaction Technology-Center of Excellence, Bielefeld University.
Insights
Infants as young as 12 months can distinguish between correct and incorrect hand movements. This ability to recognize biomechanical constraints in hand-grasping develops between 9 and 12 months, influenced by the infant
Area of Science:
- Developmental Psychology
- Infant Perception
- Motor Development
Background:
- Infant recognition of whole body shapes is well-studied.
- Limited research exists on infant recognition of single body parts and their biomechanical constraints.
- Understanding hand-grasping movements, like the pincer grip, is crucial for development.
Purpose of the Study:
- To investigate if 9- and 12-month-old infants understand hand-grasping biomechanics.
- To determine if infants can identify violations of anatomical constraints during observed hand movements.
- To explore the role of sensorimotor experience in developing this recognition ability.
Main Methods:
- Utilized a preferential looking paradigm to assess infant visual discrimination.
- Presented infants with both biomechanically possible and impossible pincer grips.
- Experiment 2 modulated the study based on infants' self-produced pincer grip experience.
Main Results:
- Twelve-month-old infants discriminated between possible and impossible pincer grips, preferring possible ones.
- This visual discrimination ability emerges by 9 months of age.
- Infants' own sensorimotor experience with pincer grip influences this developing capacity.
Conclusions:
- Infants develop the ability to visually discriminate pincer grasps based on biomechanical properties between 9 and 12 months.
- Self-produced hand movements may facilitate infants' understanding of physical constraints of the hand.
- This suggests early development of body part representations incorporating physical knowledge.
Abstract:
The development of the ability to recognize the whole human body shape has long been investigated in infants, while less is known about their ability to recognize the shape of single body parts, and in particular their biomechanical constraints. This study aimed to explore whether 9- and 12-month-old infants have knowledge of a hand-grasping movement (i.e., pincer grip), being able to recognize violations of the hand's anatomical constraints during the observation of that movement. Using a preferential looking paradigm, we showed that 12-month-olds discriminate between biomechanically possible and impossible pincer grips, preferring the former over the latter (Experiment 1). This capacity begins to emerge by 9 months of age, modulated by infants' own sensorimotor experience with pincer grip (Experiment 2). Our findings indicate that the ability to visually discriminate between pincer grasps differing in their biomechanical properties develops between 9 and 12 months of age, and that experience with self-produced hand movements might help infants in building a representation of the hand that encompasses knowledge of the physical constraints of this body part.
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