We studied the modulation of oscillatory resistance
(Ros) by viewing and imagery of affective pictures.
Thirty nonasthmatic participants viewed 36 affective slides
precategorized as positive, neutral, and negative in valence.
Each picture was presented for 15 s, followed by an imagery
epoch of 15 s. Ros, facial EMGs, respiration, skin
conductance response, heart period, and respiratory sinus
arrhythmia were measured throughout the session, as well as
viewing time and ratings of pleasure, arousal, and interest.
Increases of Ros were observed for negative pictures,
and little changes for positive or neutral pictures. Other
physiological parameters did not mirror this response pattern,
leaving no clear indication for a ventilatory or vagal origin
of Ros changes. Overall differences between behavioral
contexts of visual processing and imagery revealed evidence
for a coupling of cardiac and respiratory responses, which included
changes in Ros. The findings in Ros are
discussed in the light of earlier discrepant findings on the
affective modulation of airway resistance and cardiac activity.