The purpose of this research was to study the influence of mood on attitude change under eight conditions: 1. mood before encoding, positive mood, strong argument 2. mood before encoding, positive mood, weak argument 3. mood before encoding, negative mood, strong argument 4. mood before encoding, negative mood, weak argument 5. mood after encoding, positive mood, strong argument 6. mood after encoding, positive mood, weak argument 7. mood after encoding, negative mood, strong argument 8. mood after encoding, negative mood, weak argument. The results show, as predicted, that among subjects who were induced mood before encoding, subjects in a negative mood are more persuaded by strong than by weak argument (p<.01) and subjects in a positive mood are equally persuaded by strong and by weak arguments. Among subjects who were induced mood after encoding, subjects in a positive mood are more persuaded by strong than by week argument (p<.001) and subjects in a negative mood are more persuaded by than by week argument (p<.05).
