Abstract
In the literature there is a wide number of experiments for induction of emotions using different types of stimuli. Apart from the samples with emotional content, neutral stimuli are typically used to set up a baseline state before or after the presentation of emotional stimuli. In the present study, the effect of these neutral stimuli and the duration necessary for reaching the baseline brain activity was assessed by means of a spectral analysis of electroencephalographic signals. Concretely, the brain activity at the beginning, middle and end of a neutral stimulus was compared with the activity at the end of the previously presented emotional stimulus. The results reported that 30 s of neutral stimulus successfully led to a baseline state after the elicitation of emotions with low arousal or low valence in all brain regions and for all frequency bands, whereas the double of time was necessary for the regulation of emotional states with high arousal or high valence levels. In addition, no statistical differences were found at the end of all neutral stimuli, corroborating the achievement of a common baseline regardless of the emotional stimulus previously shown.
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Acknowledgements
Grants PID2020-115220RB-C21 and EQC2019-006063-P, funded by MCIN/AEI/ 10.13039/501100011033/ and “ERDF A way to make Europe”. Grant FPU16/03740 funded by MCIN/AEI/10.13039/501100011033/ and “ESF Investing in your future”. This work was partially supported by Biomedical Research Networking Centre in Mental Health (CIBERSAM) of the Instituto de Salud Carlos III.
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García-Martínez, B., Fernández-Caballero, A. (2022). Influence of Neutral Stimuli on Brain Activity Baseline in Emotional Experiments. In: Ferrández Vicente, J.M., Álvarez-Sánchez, J.R., de la Paz López, F., Adeli, H. (eds) Artificial Intelligence in Neuroscience: Affective Analysis and Health Applications. IWINAC 2022. Lecture Notes in Computer Science, vol 13258. Springer, Cham. https://doi.org/10.1007/978-3-031-06242-1_47
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