Innate sensitivity to face-to-face biological motion.

Area of Science:

• Ethology
• Neuroscience
• Developmental Biology

Background:

• Infants and macaque monkeys show early sensitivity to face-to-face configurations, suggesting innate social interaction preferences.
• The origin of this preference—whether learned or innate—remains unclear in many species.

Purpose of the Study:

• To investigate the innate basis of social stimulus preference in a precocial vertebrate model.
• To determine if domestic chicks exhibit a preference for face-to-face configurations.

Main Methods:

• Visually naive domestic chicks were presented with point-light displays of hen dyads in face-to-face and back-to-back arrangements.
• Spontaneous behavioral preferences were recorded to assess responses to social configurations.

Main Results:

• Female chicks demonstrated a significant spontaneous preference for the face-to-face configuration.
• Male chicks did not show a significant preference, consistent with their lower social motivation in this species.

Conclusions:

• The findings support an innate, sex-dependent predisposition towards socially interactive stimuli in the vertebrate brain.
• This suggests an evolutionary basis for early social orienting behaviors, observable even in precocial species like chicks.