TY  - JOUR
PY  - 2014//
TI  - Influence of postural threat on postural responses to aversive visual stimuli
JO  - Behavioural brain research
A1  - Lelard, Thierry
A1  - Krystkowiak, Pierre
A1  - Montalan, Benoît
A1  - Longin, Estelle
A1  - Bucchioni, Giulia
A1  - Ahmaidi, Said
A1  - Godefroy, Olivier
A1  - Mouras, Harold
SP  - 137
EP  - 145
VL  - 266
IS  - 
N2  - Recent research has shown that emotion influences postural control. The objective of the present study was to establish whether or not postural threat influences postural and physiological responses to aversive visual stimuli. In order to investigate the coupling between emotional reactions, motivated behavior and postural responses, we studied the displacement of the subject's center of pressure (COP) and the changes in electrodermal activity (EDA), heart rate (HR) and postural muscle activation. Thirty-two participants (15 males, 17 females; mean±SD age: 21.4±2.3) viewed affective and neutral pictures while standing still on a force platform in the presence or absence of postural threat. The HR and EDA data revealed that the emotional state varied as a function of the postural condition., The mean displacement in the anteroposterior (AP) axis was more rearwards in response to aversive stimuli that in response to neutral stimuli, in both the absence of postural threat (-0.65mm and +0.90mm for aversive and neutral stimuli, respectively) and the presence of postural threat (-0.00mm vs. +0.89mm, respectively). An aversive stimulus was associated with a shorter AP COP sway path than a neutral stimulus in the presence of a postural threat (167.26mm vs. 174.66mm for aversive and neutral stimuli, respectively) but not in the latter's absence (155.85mm vs. 154.48mm, respectively). Our results evidenced withdrawal behavior in response to an aversive stimulus (relative to a neutral stimulus) in the absence of postural threat. Withdrawal behavior was attenuated (but nevertheless active) in the presence of a postural threat.<p /> <p>Language: en</p>
LA  - en
SN  - 0166-4328
UR  - http://dx.doi.org/10.1016/j.bbr.2014.02.051
ID  - ref1
ER  -