Article

The present study evaluated the measurement of head movements as a valid method
for postural emotional studies using the comparison of simultaneous recording of
center of pressure (COP) sway as criterion. Thirty female students viewed a set
of 12 pleasant, 12 unpleasant and 12 neutral pictures from the International
Affective Picture System, repeated twice, using a block presentation procedure
while standing on a force platform (AMTI AccuSway).
Head movements were recorded
using a webcam ((c)KPC139E) located in the ceiling in line with the force
platform and a light-emitting diode (LED) placed on the top of the head. Open
source software (CvMob 3.1) was used to process the data. High indices of
correlation and coherence between head and COP sway were observed. In addition,
pleasant pictures, compared with unpleasant pictures, elicited greater body sway
in the anterior-posterior axis, suggesting an approach response to appetitive
stimuli. Thus, the measurement of head movement can be an alternative or
complementary method to recording COP for studying human postural changes.
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Langue : ANGLAIS