Page 101 - Emotions through the eyes of our closest living relatives- Exploring attentional and behavioral mechanisms
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                                Emotions hold the attention of bonobos and humans
Experiment 2: Examining biased attention to emotions in humans
Method
Participants
Participants were visitors of primate park Apenheul. In total, 100 adults participated
(Age category 18-30: N = 57, 31-50: N = 33, 51-80: N =9; 58 women, 41 men). We tested
participants in the visitor’s area of the bonobo enclosure, where we set up a long table
with cubicles in which we could test participants. We actively recruited participants
by approaching them when they walked past the indoor bonobo enclosures and our
setup. Participants were told that the bonobos participated in several experiments,
and that we were now collecting human data using the same tasks. Data were 4 collected between April and May 2017.
Stimuli
The same stimulus material was used as in Experiment 1. Like the bonobos, human participants saw both bonobo and human stimuli (see supplements Tables S2 and S3 for more information on the stimuli).
Equipment
Humans were tested near the indoor enclosures of the bonobos. We had a special corner dedicated to comparative research, consisting of two cubicles. One cubicle was specifically for this study. We tested participants using a 19” laptop (1920x1200 pixels) and a Tobii X2-60 eye tracker with Tobii Studio.
Calibration
Human participants were calibrated using the 5-point automated calibration procedure in Tobii Studio. Calibrations were accepted when the error displayed after finishing the calibration was minimal (less than a degree).
Procedure
Human participants were actively recruited by research assistants in the park. Visitors were approached and asked if they were interested in participating in a short, 10 minute task that was also completed by the bonobos. If visitors were interested, they were given a consent form to sign, thereby giving the experimenter permission to use their data for further analyses and publication. Participants then sat down
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