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Visually inexperienced chicks exhibit spontaneous preference for biological motion patterns.

Giorgio Vallortigara1, Lucia Regolin, Fabio Marconato

  • 1Department of Psychology, B.R.A.I.N. Centre for Neuroscience, University of Trieste, Trieste, Italy. vallorti@univ.trieste.it

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Newly hatched chicks show an innate preference for biological motion patterns, approaching animations of various vertebrates, including predators. This suggests a brain mechanism for orienting young animals toward semi-rigidly moving objects to aid learning.

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Area of Science:

  • Developmental psychology
  • Neuroscience
  • Animal behavior

Background:

  • Biological motion perception is crucial for social interaction and survival.
  • Early visual experience shapes an organism's perception and behavior.

Purpose of the Study:

  • To investigate whether newly hatched chicks exhibit a spontaneous preference for biological motion patterns.
  • To determine if this preference is specific to conspecific motion or extends to other vertebrates.

Main Methods:

  • Chicks were reared and hatched in darkness.
  • Chicks were exposed to point-light animation sequences of various biological motions.
  • Chicks' approach behaviors towards different motion patterns were observed and recorded.

Main Results:

  • Newly hatched chicks demonstrated a spontaneous preference for approaching biological motion patterns.
  • This preference was not limited to hen motion but extended to other vertebrates, including a cat.
  • The chicks' responses indicated an innate sensitivity to semi-rigid biological motion.

Conclusions:

  • Chicks possess an innate predisposition to orient towards semi-rigidly moving biological forms.
  • This mechanism likely facilitates early learning, such as imprinting, by guiding attention to relevant environmental stimuli.
  • The findings suggest a fundamental neural basis for biological motion perception in precocial birds.