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3 results for “social contagion”
Reverse social contagion as a mechanism for regulating mass behaviors in highly integrated social systems
<h1>Reverse social contagion as a mechanism for regulating mass behaviors in highly integrated social systems</h1> <p>This repository houses supporting data for “Reverse social contagion as a mechanism for regulating mass behaviors in highly integrated social systems”. It contains three archives consisting of multiple files storing inter-individual interactions, trajectory data for multiple colonies of desert harvester ants (Pogonomyrmex californicus), and the code necessary to reproduce the study results. The behavioral data sets were obtained from 30s videos filmed at 15fps. </p> <h2>Description of the data and file structure</h2> <h3>Supplementary_Archive_1.zip</h3> <p>This collection of CSV files contains the antennal contact interactions among individual workers from colonies. Each file name represents the colony code and the data contained in each file belongs to a single colony. Each file contains three columns: The first (1) column represents the tag of an individual observed, the second (2) column represents the tag of the individual it interacted with, and the third (3) column represents the frame of the video at which the interaction occurred.</p> <h3>Supplementary_Archive_2.zip</h3> <p>This group of mdf files contains the trajectory data for each individual of a harvester ant colony. The files were generated using the ImageJ plugin MTrackJ. Each file contains the data of one colony and the filename represents the code of said colony. The data contained in this file is organized in rows and columns. The first row indicates the MTrackJ software version used to generate the file. The second row indicates the displaying preferences for the MTrackJ software. The third and fourth rows indicate the number of assemblies and clusters, respectively. However, this can be safely ignored as the colony was treated as a whole. The rows starting with ‘Track’ indicate the tag of the individual observed followed by its identifying number “Track 1” belongs to individual 1, “Track 2” belongs to individual 2, “Track 3 to individual 3, and so forth. The lines that start with ‘Point’ after each ‘Track’ represent the point in space in the video for each individual in a given frame. The second column after ‘Point’ simply refers to the point ID in the frame “e.g. Point 1”. The third and fourth columns represent the ‘x’ and ‘y’ coordinates in the video frame. The fourth, fifth, and sixth columns represent the dimensions of an image stack. In this case, the fourth and sixth columns are fixed to 1 and the fifth column represents the frame at which the point is taken. Each point is captured in 5-frame increments.</p> <h2>Code/Software</h2> <h3>Supplementary_Archive_3.zip</h3> <p>This archive contains the code necessary to reproduce the results of the study in the form of a Mathematica notebook. It also contains a folder with the trajectory data for each individual of a harvester ant colony, in a simplified format from that available in Supplementary_Archive_2.zip. Each CSV file in this folder corresponds to a different colony. It has four columns, respectively representing the identifying number of the individual observed, the frame number at which the observation, and the ‘x’ and ‘y’ coordinates, in that order. Finally, a XLSX file contains the number of individuals in each colony (first column), the metabolic rate of the colony (second column), and the identifying number of the colony (third column; numbers followed by the letter 's' correspond to size-reduced colonies). </p>
Social contagion of affiliation in female macaques
<p>Social contagion of non-interactive behavior is widespread among animals including humans. It is thought to facilitate behavioral synchronization and consequently group cohesion, coordination, and opportunities for social learning. Contagion of interactive behavior - particularly affiliation - has received much less attention. Here, we investigated in female rhesus macaques (Macaca mulatta) the effect of observing group members groom on a subject's subsequent grooming behavior and the potential modulation of contagion by relationship quality and social status. We recorded behavior after subjects witnessed a grooming event and compared it to behavior in a control condition with the same individuals in proximity but in the absence of a stimulus grooming event. Compared to the control condition, after observing others groom, females engaged in a grooming interaction sooner, and were more likely to be the initiator and to take on the active groomer role. Dominance rank of the focal individual and more weakly also of the stimulus individuals affected the latency to the next grooming interaction of the focal subject. Latency to the next grooming interaction decreased with increasing rank of the subject potentially reflecting lower social constraints faced by high ranking individuals in this highly despotic species. Relationship quality between the subject and the stimulus individuals had no effect on latency to grooming. Collectively, our findings provide evidence for visual contagion of affiliation in rhesus macaques. Future studies should explore the systematic variation in contagion of interactive behavior in relation to a gradient of social tolerance.</p>
Social contagion of affiliation in female macaques
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