Effects of situational demands on the direction of electrodermal activation during smoking

Task demands (normal smoking; sham smoking; smoking or non-smoking during complex cognitive performance; and, smoking or non-smoking during monotonous vigilance performance) were manipulated in three experiments. Smoking increased electrodermal activity (EDA) arousal from pre-smoking baseline. Sham smoking (as a control for motoric aspects) also increased EDA arousal but to a lesser degree. In contrast the demands of complex cognitive performance were associated with lower EDA arousal during smoking than during non-smoking. Finally, during vigilance performance smoking maintained EDA arousal which during non-smoking decreased. Smoking did not improve performance during complex cognitive processing or vigilance above deprivation performance levels. It was concluded that smoking did have bidirectional effects as a function of task demand. However, there was no evidence that these physiological changes were functional and the smoking behavior data gave no indication as to the cause of these changes.