Sameness May Be a Natural Concept That Does Not Require Learning.

Area of Science:

• Cognitive ethology
• Animal cognition
• Comparative psychology

Background:

• Pigeons' learning in match-to-sample tasks was previously thought to be simple stimulus-response chains.
• The concept of sameness was not believed to be acquired by pigeons in these tasks.
• Neophobia in pigeons can affect their transfer of learning to novel stimuli.

Purpose of the Study:

• To investigate whether pigeons learn the concept of sameness beyond simple stimulus-response associations.
• To determine if pigeons utilize the concept of sameness in both matching and mismatching tasks.
• To explore the fundamental nature of the concept of sameness in animal cognition.

Main Methods:

• Pigeons were trained on two tasks: matching and mismatching, using colors as stimuli.
• In each task, one comparison stimulus was either matching or nonmatching to the sample.
• Familiar stimuli, previously unassociated with the sample, were introduced to test stimulus generalization.

Main Results:

• Pigeons in both matching and mismatching groups successfully located the stimulus that matched the sample.
• Task performance indicated pigeons chose the matching stimulus when required (matching task) and avoided it when required (mismatching task).
• Results suggest pigeons' choices were based on identifying the identical stimulus, demonstrating the concept of sameness.

Conclusions:

• The concept of sameness is a foundational cognitive ability in pigeons, not merely a learned association.
• This basic concept underlies performance in both matching and mismatching tasks.
• The ability to grasp sameness may be an evolved trait present across diverse species, including humans.