Freezing, defined as a lack of movement except for heartbeat and respiration associated with a crouching posture, was recorded every 10 sec by two trained observers (one was blind to the experimental conditions) during the 3 min trial for a total of 18 sampling intervals.
![[This page as RDF]](http://data.gesis.org/somesci/static/rdf-icon.gif){kind=icon}