Eighteen-month-old human infants show intensive development in comprehension of different types of pointing gestures

Area of Science:

• Developmental psychology
• Comparative cognition
• Human infant development

Background:

• Understanding pointing gestures is crucial for social communication.
• Previous research has compared human and animal pointing comprehension using similar tasks.
• Human infants' developmental trajectory for understanding pointing gestures requires further elucidation.

Purpose of the Study:

• To investigate the developmental timeline of human infants' comprehension of different pointing gestures.
• To compare human infants' pointing comprehension abilities with those of animal species under identical conditions.
• To identify the age at which infants master various pointing gestures, considering familiarity.

Main Methods:

• Longitudinal study involving 16 children tested from 12 to 18 months of age.
• Utilized a two-choice task to assess comprehension of four types of pointing gestures (distal, long cross-pointing, forward cross-pointing, far pointing).
• Employed standardized testing procedures previously used with animal species.

Main Results:

• Infants did not exceed chance level at 12 and 14 months for any gesture type.
• Success with distal and long cross-pointing gestures emerged by 16 months.
• By 18 months, infants demonstrated high success rates with less familiar gestures (forward cross-pointing, far pointing).
• Skills at 18 months mirrored those previously observed in dogs using the same methods.
• Early comprehension (before 16 months) was noted in some infants, highlighting significant individual variation.

Conclusions:

• Human infants' comprehension of pointing gestures develops progressively, with mastery of less familiar gestures occurring later.
• The developmental pattern in human infants shows parallels with animal cognition, particularly dogs, when assessed under similar conditions.
• Significant individual variability exists in the development of pointing gesture comprehension, a common feature in human cognitive development.