The present study utilized a fear potentiated startle paradigm to examine amygdala function in individuals with autism spectrum disorder. Two competing hypotheses regarding amygdala dysfunction in autism have been proposed: (1) The amygdala is under-responsive, in which case it would be predicted that, in a fear potentiated startle experiment, individuals with autism would exhibit decreased fear conditioning and/or potentiation, and (2) The amygdala is over responsive, in which case an exaggerated potentiation of the startle response would be predicted. Fourteen adolescents and adults diagnosed with autism spectrum disorder and 14 age, gender, IQ, and anxiety level-matched typical adolescents and adults participated. Both participants with autism and typical participants potentiated the startle response following fear conditioning and no group differences in the latency or amplitude of the potentiated startle response were found. These results suggest that this aspect of amygdala function, namely fear conditioning and potentiation of the startle response, is intact in individuals with autism.
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Acknowledgements
This research was funded by a program project grant from the National Institute of Child Health and Human Development and the National Institute on Deafness and Communication Disability (PO1HD34565), which is part of the NICHD/NIDCD Collaborative Program of Excellence in Autism, a center grant from the National Institute of Mental Health (U54MH066399), which is part of the NIH STAART Centers Program, and the Cure Autism Now Foundation. We gratefully acknowledge the contributions of individuals who participated in this study and several other people who made significant contributions to this research: James McPartland, Jeff Munson and several undergraduate research assistants.
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Bernier, R., Dawson, G., Panagiotides, H. et al. Individuals with Autism Spectrum Disorder Show Normal Responses to a Fear Potential Startle Paradigm. J Autism Dev Disord 35, 575–583 (2005). https://doi.org/10.1007/s10803-005-0002-0
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DOI: https://doi.org/10.1007/s10803-005-0002-0