Does surprise enhance infant memory? Assessing the impact of the encoding context on subsequent object recognition

Area of Science:

• Developmental Psychology
• Cognitive Neuroscience

Background:

• Discrepancies between predictions and observations trigger heightened attention and learning readiness in infants and adults.
• This heightened attention may enhance memory encoding and consolidation of surprising information.

Purpose of the Study:

• To investigate if surprise during encoding improves subsequent memory for items violating infant expectations.
• Examining the role of surprise in infant memory processes.

Main Methods:

• Seventeen-month-old infants were presented with familiar objects, some correctly labeled and others mislabeled.
• Pupil dilation was measured during labeling (encoding) and a recognition memory test.
• Mislabeled items were expected to elicit surprise, indicated by pupil dilation.

Main Results:

• Infants exhibited greater pupil dilation to mislabeled items, indicating surprise.
• Pupil dilation during the recognition test suggested successful retrieval processes.
• Despite surprise responses, infants did not show enhanced memory for mislabeled items.

Conclusions:

• Surprise responses in infants, evidenced by pupil dilation, do not necessarily facilitate memory encoding.
• Infant memory consolidation for unexpected items may require more than just an initial surprise reaction.