Perception
Does learning to sit help babies see which shape is in front?
Open access · cc by · source: Europe PMC
Babies of the same age who could already sit on their own treated a symmetrical shape as the object in front, while babies who could not yet sit showed no such preference.
Study at a glance
- Design
- Other — Two infant preferential-looking experiments comparing naturally occurring groups (sitters vs non-sitters); the stimulus contrast is within-subject but sitting status is not manipulated.
- N
- 36 infants in Experiment 1 (sitting by parent report) and 44 infants in Experiment 2 (23 sitters and 21 non-sitters by a lab sitting test).
- Population
- Healthy full-term 6.5-month-old infants from mostly middle-class, mostly White US families.
- Outcome
- Proportion of looking time directed to the display where motion and symmetry agreed on which region was the figure; habituation measures as a control.
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Key findings
In Experiment 1, sitters looked longer at the consistent display when both displays used the same kind of motion (a large effect, d = 2.18), while non-sitters looked at chance; sitters beat non-sitters on these trials (d = 1.28). Experiment 2 replicated the sitters' preference (d = 0.94) and again found none in non-sitters, although the direct sitter-versus-non-sitter difference was not significant this time (p = 0.19). Sitters and non-sitters did not differ on the habituation task, and parent report matched the lab sitting test 100% for sitters.
Methodology
Infants aged about six and a half months watched pairs of animated displays, each made of a symmetrical region joined to an asymmetrical one. After a 2-second still period one region slid in front of or behind the other, so that in one display motion and symmetry agreed on which region was the 'figure' and in the other they conflicted. Experiment 1 grouped 36 infants as sitters or non-sitters by parent report; Experiment 2 tested 44 infants, checked sitting with a 30-second lab test, and added an unrelated habituation task to see whether sitters were simply more advanced overall.
Limitations
Sitting was not manipulated, so the study cannot show that sitting causes the new sensitivity; some other change that happens alongside sitting could explain it. The groups were small and demographically narrow, the sitting test was a simple 30-second check rather than a standardised motor scale, and in Experiment 2 the between-group comparison itself was not significant. The preference only appeared when both displays used the same type of motion, and the authors acknowledge they cannot be sure why infants preferred the consistent displays.
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