Disappearing Décalage: Object Search in Light and Dark at 6 Months

Area of Science:

• Cognitive Development
• Infant Psychology
• Object Permanence

Background:

• Infants typically search for hidden objects later when occlusion is used compared to darkness.
• This delay, known as décalage, is explained by differences in action or representation demands.
• Previous tasks confounded these two factors, making it difficult to isolate the cause.

Purpose of the Study:

• To investigate the causes of the "dark advantage" in infant object search.
• To disentangle action demands from representation demands in object search tasks.
• To test explanations for why infants find objects hidden in darkness more easily than those hidden by occlusion.

Main Methods:

• Developed a novel search task where objects were hidden by submersion in liquid, not occlusion.
• This method equalized action demands in light and dark conditions.
• Tested 6-month-old infants in both light and dark conditions using the liquid submersion task.

Main Results:

• Infants unexpectedly showed a "dark disadvantage" in Experiment 1, performing worse in the dark.
• Experiment 2 indicated that representation demands might be higher in the dark.
• Infants' search performance in the dark matched, but did not exceed, performance in the light.

Conclusions:

• Six-month-olds can search for objects hidden in liquid in both light and dark conditions.
• Findings support both action-demand and representation-demand explanations for the observed décalage in infant search behavior.
• The study successfully unconfounded action and representation demands in infant object permanence research.