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• W4249486534 abstract "Abstract Background: Irritability is a common and impairing occurrence in autistic youth, yet the underlying mechanisms are not well known. In typically developing populations, differences in frustration response have been suggested as important driver of the behavioural symptoms of irritability. Research exploring the role of frustration response as a risk factor for irritability in autistic populations is limited and often uses on parent report or observer ratings; objective measures of frustration response appropriate for use in autistic populations are required to advance the field. Methods: In the current study, fifty-two autistic adolescents aged 13-17 years from a population-based longitudinal study completed an experimental task designed to induce frustration through exposure to periods of unexpected delay. Behavioural (number of button presses) and physiological (heart rate; HR) metrics were collected during delay periods. Irritability was measured using the parent-rated Affective Reactivity Index (ARI). Analyses used mixed-level models to test whether irritability was associated with different slopes of behavioural and physiological response in response to experimentally induced frustration. Age and baseline HR (for the physiological data only) were included as covariates. Results: Analyses showed a marginal association between irritability and the slope of behavioural response (incident rate ratio=.98, p=.06), and a significant association with the slope of physiological response (b=-.10, p=.04); higher levels of irritability were associated with a dampened behavioural and physiological response, as indicated by flatter slopes of change over the course of the task. This pattern of results remained when adjusting for IQ, autism symptom severity and medication use (association between irritability and slope of behavioural response: incident rate ratio=.98, p=.02; slope of HR response; b=-.10, p=.04). Conclusions : Results suggest that the current experimental task may be a useful objective measure of frustration response for use with autistic populations, and that a non-adaptive response to frustration may be one biological mechanism underpinning irritability in autistic youth. This may represent an important target for future intervention studies." @default.
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• W4249486534 date "2020-10-26" @default.
• W4249486534 modified "2023-09-27" @default.
• W4249486534 title "Behavioural and Physiological Response to Frustration in Autistic Youth: Associations with Irritability" @default.
• W4249486534 doi "https://doi.org/10.21203/rs.3.rs-96188/v1" @default.
• W4249486534 hasPublicationYear "2020" @default.
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