Loser Effect
Loser Effect - Related Videos
07:19
A New Approach that Eliminates Handling for Studying Aggression and the "Loser" Effect in Drosophila melanogaster
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Cited by 13 •
2015
During fruit fly fights, the behavioral patterns observed, fight dynamics, and associated learning and memory are influenced by experimental conditions. The protocol presented here describes a novel procedure that entirely eliminates handling of flies during experiments. This improves fight dynamics and allows formation of strong "loser" effects.
03:13
Drosophila Aggression Assay: A Method to Test Behavioral Plasticity in Flies
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2023
Aggression is an innate behavior and previous fighting experience affects fighting strategy and outcome of later contests in flies. This video describes an assay used to study Drosophila's aggressive behavior. The example protocol features the assay performed in a setup that eliminates fly handling and therefore reduces stress for the animals, which would otherwise impact the subjects' performance.
01:34
Groupthink
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2020
When in group settings, we are often influenced by the thoughts, feelings, and behaviors around us. Groupthink is another phenomenon of conformity where modification of the opinions of members in a group aligns with what they believe is the group consensus (Janis, 1972). In such situations, the group often takes action that individuals would not perform outside the group setting because groups make more extreme decisions than individuals do. Moreover, groupthink can hinder opposing trains of...
03:34
Assessing Social Dominance in Mouse Models Using the Tube Test
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Cited by 1 •
2025
This protocol describes a behavioral assay to evaluate social dominance in rodents using the tube test. Social dominance remains stable over time, and several models of developmental and neurological disorders exhibit robust social dominance abnormalities. Therefore, the tube test serves as a convenient outcome measure for mechanistic studies or preclinical therapeutic screening.
10:42
Flow Cytometric Analysis of Particle-bound Bet v 1 Allergen in PM10
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Cited by 8 •
2016
Here, we present a protocol to quantify allergen-loaded particles by flow cytometry. Ambient particulate matter particles may act as carriers of adsorbed allergens. We show here that flow cytometry, a method widely used to characterize suspended solids >0.5 µm in diameter, can be used to measure these allergen-loaded particles.
FAQs
Information acquired during a defeat can influence stress physiology, motivation, aggression, and assessment of an opponent’s status. These changes may make an individual less willing or less able to compete effectively in a later encounter. The mechanism therefore links a social experience to subsequent behavior, showing how contest outcomes can produce feedback beyond the original interaction.
The loser effect and winner effect describe contrasting consequences of social experience. A defeat may reduce later competitive performance, whereas a victory can produce the opposite pattern, increasing subsequent success. Studying both effects helps biologists examine how prior outcomes shape behavior and physiology rather than treating each contest as an isolated event.
The effect may persist because an individual’s response is not limited to the original opponent or resource. Sensory and social information from the earlier contest can modify how the animal assesses status, threat, or its own competitive capacity. Consequently, altered motivation, aggression, or stress physiology may influence performance under changed social or resource conditions.
Social experience can connect behavior and physiology through changes in stress responses, motivation, aggression, and status assessment. When these processes influence later contests, they can affect access to dominance positions, territories, mating opportunities, and other resources. The loser effect therefore provides a framework for studying how individual experiences contribute to broader social organization.
A study can examine an individual’s outcome in an initial contest and then evaluate its performance in a later encounter, including situations in which the opponent or available resources differ. Researchers can relate changes in competitive behavior to observations of stress physiology, motivation, aggression, or status assessment. This design tests whether prior social experience predicts later performance.
Research on this phenomenon can clarify how repeated social experiences influence dominance hierarchies, territory access, mating opportunities, and resource use. Because the pattern has been studied in animals ranging from insects to vertebrates, it also supports comparisons across biological systems. These comparisons help connect behavioral outcomes with physiological responses and the surrounding social environment.