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Group choices seemingly at odds with individual preferences.

Michel-Olivier Laurent Salazar1, Stamatios C Nicolis1, Mariano Calvo Martín1

  • 1Unit of Social Ecology, CP 231, Université libre de Bruxelles, Campus Plaine, Boulevard du Triomphe, Building NO Level 5, Brussels, Belgium.

Royal Society Open Science
|August 10, 2017
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Summary

Social context alters cockroach preferences. While individuals prefer vanillin-scented shelters, groups aggregate in unscented ones, driven by reduced inter-insect attraction to vanillin.

Keywords:
cockroachescollective choicegroup preferenceindividual preferencessocial contextvanillin

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Area of Science:

  • Behavioral Ecology
  • Insect Behavior
  • Social Decision-Making

Background:

  • Individual preferences can be amplified by social interactions.
  • Environmental cues, like vanillin, influence insect behavior.
  • Understanding social context effects on decision-making is crucial.

Purpose of the Study:

  • To investigate how the social context of *Periplaneta americana* cockroaches influences their shelter preferences.
  • To determine if group behavior leads to a collective inversion of individual preferences for vanillin-scented shelters.

Main Methods:

  • Experimental setup offering two shelters, one vanillin-scented, to isolated and grouped cockroaches.
  • Observation of individual and group choices and occupancy duration in shelters.
  • Development of a theoretical model to explain observed behaviors.

Main Results:

  • Isolated cockroaches showed a preference for the vanillin-scented shelter.
  • Grouped cockroaches predominantly chose the unscented shelter.
  • Higher overall shelter occupancy was observed when groups selected the unscented shelter.

Conclusions:

  • Individual preference for vanillin is not inverted in groups.
  • Vanillin's attractiveness to individuals decreases with increasing group size, reducing inter-insect attraction.
  • This reduced attraction promotes aggregation in the unscented shelter, resulting in collective preference inversion.