Journal Article

Dynamics of Person-to-Person Interactions from Distributed RFID Sensor Networks

Barrat, Alain, Colizza, Vittoria, Pinton, Jean-François, Cattuto, Ciro, Vespignani, Alessandro, Van den Broeck, Wouter

2010

Overview

Digital networks, mobile devices, and the possibility of mining the ever-increasing amount of digital traces that we leave behind in our daily activities are changing the way we can approach the study of human and social interactions. Large-scale datasets, however, are mostly available for collective and statistical behaviors, at coarse granularities, while high-resolution data on person-to-person interactions are generally limited to relatively small groups of individuals. Here we present a scalable experimental framework for gathering real-time data resolving face-to-face social interactions with tunable spatial and temporal granularities. We use active Radio Frequency Identification (RFID) devices that assess mutual proximity in a distributed fashion by exchanging low-power radio packets. We analyze the dynamics of person-to-person interaction networks obtained in three high-resolution experiments carried out at different orders of magnitude in community size. The data sets exhibit common statistical properties and lack of a characteristic time scale from 20 seconds to several hours. The association between the number of connections and their duration shows an interesting super-linear behavior, which indicates the possibility of defining super-connectors both in the number and intensity of connections. Taking advantage of scalability and resolution, this experimental framework allows the monitoring of social interactions, uncovering similarities in the way individuals interact in different contexts, and identifying patterns of super-connector behavior in the community. These results could impact our understanding of all phenomena driven by face-to-face interactions, such as the spreading of transmissible infectious diseases and information.

• Publisher: Public Library of Science,Public Library of Science (PLoS)
• Subject: Activities of daily living / Analysis / Behavior / Community property / Community size / Computer Science/Applications / Computer Science/Information Technology / Condensed Matter / Connectors / Data / Data collection / Economic models / Electronic devices / Experiments / High resolution / Humans / Infectious diseases / Infrastructure / Interpersonal Relations / Mobile devices / Mobile phones / Networks / Physics / Physics and Society / Physics/Interdisciplinary Physics / Proximity / Radio / Radio frequency identification / Radio Frequency Identification Device / RFID equipment / Semantic web / Semantics / Sensors / Small groups / Social aspects / Social behavior / Social factors / Social interaction / Social interactions / Social networks / Statistical Mechanics / Statistics / Surveillance / Wireless networks