Visually-naïve chicks prefer agents that move as if constrained by a bilateral body-plan

Area of Science:

• Developmental psychology
• Comparative cognition
• Neuroethology

Background:

• Early detection of animate agents is crucial for survival.
• Animate motion often aligns with an organism's body axis due to bilateral symmetry.
• Understanding innate preferences for animacy cues provides insight into early social cognition.

Purpose of the Study:

• To investigate whether visually-naïve newborn chicks exhibit a preference for motion patterns indicative of animacy.
• To determine if chicks respond to the parallelism between an object's axis and its trajectory.
• To explore innate social preferences in non-human animals related to morphological constraints.

Main Methods:

• Presenting visually-naïve newborn chicks (Gallus gallus domesticus) with visual stimuli.
• Observing chick behavioral responses (attraction/preference) to objects with specific motion patterns.
• Analyzing the correlation between object's main axis, motion trajectory, and chick preference.

Main Results:

• Chicks showed a significant attraction to objects whose motion trajectory was parallel to their main body-axis.
• This preference mirrors human perception of animacy cues.
• Chicks also demonstrated a preference for rotational movements, suggesting a response to self-propulsion cues.

Conclusions:

• Newborn chicks possess an innate preference for visual cues associated with animate motion.
• This preference is linked to the constraints of bilateral symmetry in movement.
• The findings suggest a conserved mechanism for animacy and agency detection across species from birth.