Social inhibitory control in five lemur species

Area of Science:

• Primate behavior
• Cognitive ethology
• Comparative psychology

Background:

• Inhibitory control is crucial for navigating social dynamics.
• Understanding social cognition in lemurs can provide insights into primate evolution.

Purpose of the Study:

• To evaluate inhibitory control skills in five lemur species within a social context.
• To determine if sociality and ecological differences influence inhibitory control.
• To establish a novel experimental paradigm for assessing social inhibition.

Main Methods:

• A social learning task involving two human experimenters with distinct food-sharing behaviors (generous vs. competitive).
• Lemurs (N=52) were trained to associate experimenters with reward availability.
• An inhibition test phase presented a more valuable reward from the competitive experimenter, requiring subjects to inhibit approach.

Main Results:

• Lemurs learned to approach the generous experimenter and avoid the competitive one.
• Lemur tendency to approach the competitive experimenter increased during test trials.
• Subjects showed some capacity for inhibitory control by approaching the larger reward less frequently in test trials compared to pretest trials.

Conclusions:

• The five tested lemur species exhibited similar capacities for inhibitory control in this social context.
• The experimental task effectively manipulated lemur behavior, indicating sensitivity to social cues and reward value.
• This paradigm may serve as a valuable tool for comparative studies on social inhibition across different species.