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Overactivity, impulsivity and repetitive behaviour in males with fragile X syndrome: contrasting developmental trajectories in those with and without elevated autism symptoms
Author(s) -
Crawford H.,
Moss J.,
Stinton C.,
Singla G.,
Oliver C.
Publication year - 2018
Publication title -
journal of intellectual disability research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.941
H-Index - 104
eISSN - 1365-2788
pISSN - 0964-2633
DOI - 10.1111/jir.12488
Subject(s) - autism , fragile x syndrome , impulsivity , psychology , developmental disorder , pervasive developmental disorder , developmental psychology , clinical psychology , audiology , psychiatry , medicine
Abstract Background Hyperactivity and repetitive behaviour are characteristic features of fragile X syndrome (FXS). However, little is known about the influence of autism symptomatology on how these characteristics develop over time. We investigate the profiles and developmental trajectories of overactivity, impulsivity and repetitive behaviour, in males with FXS over three time points spanning 8 years. Method Participants formed two subgroups, those who displayed elevated symptoms of autism at Time 1 ( n = 37; M age = 16.32; age range = 6.61–43.51) and those who did not ( n = 32; M age = 8.43; age range = 8.94–47.49). Results Participants without elevated symptoms of autism showed a reduction in impulsivity and repetitive questioning over time, whereas those with elevated symptoms of autism did not. Differences between the two subgroups in several topographies of repetitive behaviour emerged at Time 3 only. Conclusions These results further understanding of the relationship between autistic phenomenology and behavioural characteristics in FXS.