This study used the biological model of experimental hypoglycaemia to exami
ne the effect of a manipulation in mood-state on appraisal. Controlled hypo
glycaemia was achieved using the hyperinsulinaemic glucose clamp technique.
Mood, appraisal, and personality traits were assessed using well validated
questionnaires. Our findings 1) reaffirm the existence of multiple arousal
systems in the generation of moods, 2) show that the induction of a negati
ve mood state does lead to more negative appraisals of a life situation, an
d 3) show that personality traits remain stable during the experience of ne
gative emotions and cognitions. We conclude that hypoglycaemia, by inducing
a state of tense tiredness in some individuals, may lead to more negative
appraisals of a life situation but does not alter people's reporting of beh
avioural dispositions.