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00925njm 22002777a 4500 dc Roca Morales, Pablo author Vázquez Valverde, Carmelo José author Onde Pérez, Daniel author 2023-03-09 The present study aims to develop a brief instrument to assess self-reported affective experiences, the Hedonic and Arousal Affect Scale (HAAS), rooted in the valence-arousal model of affect. Throughout four different studies, we found that: (1) the 12-item version showed a better goodness-of-fit than an initial longer version (Study 1; n = 259); (2) the two-dimensional model of affect (i.e., four-factor model: positive affect and high arousal, positive affect and low arousal, negative affect and high arousal, and negative affect and low arousal) showed the best fit to our data (Study 2; n = 525); (3) the HAAS showed evidence of concurrent validity with related measures in the field (Study 3; n = 480); and (4) it showed partial support for temporal invariance (Study 4; n = 262). The content and psychometric qualities of the HAAS make it a suitable brief scale to measure affect and could be particularly useful for repeated measures designs such as psychological interventions, experimental studies, or ecological momentary assessment studies. Roca, P., Vázquez, C., & Ondé, D. (2023). The Hedonic and Arousal Affect Scale (HAAS): A brief adjective checklist to assess affect states. Personality and Individual Differences, 207, 112151. 0191-8869 10.1016/j.paid.2023.112151 https://hdl.handle.net/20.500.14352/97880 https://www.sciencedirect.com/science/article/pii/S0191886923000740?via%3Dihub The Hedonic and Arousal Affect Scale (HAAS): a brief adjective checklist to assess affect states