1. We observed an association between symmetry and positive valence starting from 250ms from onset. The congruency effect was evident only when words were attended and task-irrelevant patterns remained in the background. IntroductionExperiment Methods Experiment 1 N= 24 Task 1: Discriminate Regularity [144 trials] participants classified regularity: Symmetry or Random? Task 2: Discriminate Word [144 trials] participants classified word valence: Positive or Negative? Experiment 2 N= 24 One task [288 trials] Participants attended to both regularity and word valence simultaneously Electrodes selected for the analysis: The order of the task was balanced between participants Task 1: Discriminate RegularityTask 2: Discriminate Word SPN (250-1000 ms) Random Positive – Random Negative Reflection Positive – Reflection Negative Experiment 1Experiment 2 Amplitude +/- 1.5μv Random Positive– Random Negative Reflection Positive – Reflection Negative SPN* (250-1000 ms) N1 (170-200 ms) P1 (100-130 ms) Strong difference between Reflection and Random, P <.001 Weaker differenc e P =.05 p =.07 Congruency Effect For reflection patterns, p=.005 No effect with Random patterns! :-( No congruency effect No effects! P <.001 Symmetry is associated with beauty and positive valence both on explicit and implicit behavioural tasks. This study investigated the neural correlates of this association. Participants saw symmetric [reflection] and random patterns with either positive or negative words superimposed. We recorded ERP from posterior clusters of electrodes. We expected a congruency effect for reflection with positive words and random with negative words on the Sustained Posterior Negativity (SPN), a symmetry-specific component. In Experiment 1 pattern regularity or word valence were classified in two separate blocks. In Experiment 2 participants attended to both on each trial. Results Reflection – Random We suggest that this is due to the fact that word valence is easier and faster to evaluate, allowing time and resources to process the valence of the pattern. Discussion Conclusion Bertamini M, Makin A, Pecchinenda A (2013a) Testing Whether and When Abstract Symmetric Patterns Produce Affective Responses. PLoS ONE 8(7): e68403. Bertamini, M., Makin, A., & Rampone, G. (2013b). Implicit association of symmetry with positive valence, high arousal and simplicity. i-Perception, 4(5), 317--327. Hofel, L., & Jacobsen, T. (2007a). Electrophysiological indices of processing aesthetics: Spontaneous or intentional processes? [Article]. International Journal of Psychophysiology, 65(1), 20-31 Makin, A. D., Rampone, G., Pecchinenda, A., & Bertamini, M. (2013). Electrophysiological responses to visuospatial regularity. Psychophysiology. Makin, A. D. J., Pecchinenda, A., & Bertamini, M. (2012a). Implicit affective evaluation of visual symmetry. Emotion, 12(5), 1021-1030. Makin, A. D. J., Wilton, M. M., Pecchinenda, A., & Bertamini, M. (2012b). Symmetry perception and affective responses: A combined EEG/EMG study. Neuropsychologia,50(14), 3250-3261. Scott, G. G., O.Donnell, P. J., Leuthold, H., & Sereno, S. C. (2009). Early emotion word processing: Evidence from event-related potentials. Biological psychology, 80(1), 95--104. Would you like a pdf copy of the paper?? References