Fombonne, E. Past and future perspectives on autism epidemiology. In Understanding Autism, from Basic Neuroscience to Treatment (eds Moldin, SO, Rubenstein, JLR): 25–48. Taylor & Francis, 2006.
Shea, V, Mesibov, G. Adolescents and adults with autism. In Handbook of Autism and Pervasive Developmental Disorders (5th edn) (eds Volkmar, FR, Paul, R, Klin, A & Cohen, D): 288–311. John Wiley & Sons, 2005.
Chakrabarti, S, Fombonne, E. Pervasive developmental disorders in preschool children: confirmation of high prevalence. Am J Psychiatry
2005; 162: 1133–41.
Skuse, DH. Rethinking the nature of genetic vulnerability to autistic spectrum disorders. Trends Genet
2007; 23: 387–95.
Scott, FJ, Baron-Cohen, S, Bolton, P, Brayne, C. The CAST (Childhood Asperger Syndrome Test): preliminary development of a UK screen for mainstream primary-school-age children. Autism
2002; 6: 9–31.
Baron-Cohen, S, Wheelwright, S, Skinner, R, Martin, CE. The Autism Spectrum Quotient (AQ): Evidence from Asperger syndrome/high functioning autism, males and females, scientists and mathematicians. J Autism Dev Disord
2001; 31: 5–17.
Ronald, A, Happé, F, Price, TS, Baron-Cohen, S, Plomin, R. Phenotypic and genetic overlap between autistic traits at the extremes of the general population. J Am Acad Child Adolesc Psychiatry
2006; 45: 1206–14.
Ronald, A, Happé, F, Plomin, R. A twin study investigating the genetic and environmental aetiologies of parent, teacher and child ratings of autistic-like traits and their overlap. Eur Child Adolesc Psychiatry
2008; 17: 473–83.
Oliver, BR, Plomin, R. Twins' Early Development Study (TEDS): a multivariate, longitudinal genetic investigation of language, cognition, and behavior problems from childhood through adolescence. Twin Res Hum Genet
2007; 10: 96–105.
Price, TS, Freeman, B, Craig, IW, Petrill, SA, Ebersole, L, Plomin, R. Infant zygosity can be assigned by parental report questionnaire data. Twin Res
2000; 3: 129–33.
Ronald, A, Happé, F, Bolton, P, Butcher, LM, Price, TS, Wheelwright, S, et al. Genetic heterogeneity between the three components of the autism spectrum: a twin study. J Am Acad Child Adolesc Psychiatry
2006; 45: 691–9.
American Psychiatric Association. Diagnostic and Statistical Manual of Mental Disorder (4th edn) (DSM–IV). APA, 1994.
Williams, J, Allison, C, Scott, F, Stott, C, Bolton, P, Baron-Cohen, S, et al. The Childhood Asperger Syndrome Test (CAST): test-retest reliability. Autism
2006; 10: 415–27.
Wechsler, D. Wechsler Intelligence Scale for Children (3rd edn) (WISC–III–UK). The Psychological Corporation, 1992.
McCarthy, D. McCarthy Scales of Children's Abilities. The Psychological Corporation, 1972.
Petrill, S, Rempell, J, Oliver, B, Plomin, R. Testing cognitive abilities by telephone in a sample of 6-to-8-year olds. Intelligence
2002; 30: 353–60.
Lohman, D, Hagen, E, Thorndike, R. Cognitive Abilities Test (3rd edn) (CAT3). nferNELSON, 2003.
Goodman, R, Ford, T, Richards, H, Gatward, R, Meltzer, H. The Development and Well-Being Assessment: description and initial validation of an integrated assessment of child and adolescent psychopathology. J Child Psychol Psychiatry
2000; 41: 645–55.
Neale, MC, Boker, SM, Xie, G, Maes, HH. Mx: Statistical Modeling. Virginia Commonwealth University Department of Psychiatry, 2006.
Plomin, R. Genetic risk and psychosocial disorders: links between the normal and abnormal. In Biological Risk Factors for Psychosocial Disorders (eds Rutter, M & Casaer, P): 101–38. Cambridge University Press, 1991.
DeFries, JC, Fulker, DW. Multiple regression analysis of twin data: etiology of deviant scores versus individual differences. Acta Genet Med Gemellol (Roma)
1988; 37: 205–16.
Light, JG, DeFries, JC. Comorbidity of reading and mathematics disabilities: genetic and environmental etiologies. J Learn Disabil
1995; 28: 96–106.
Plomin, R, DeFries, JC. Multivariate behavioral genetic analysis of twin data on scholastic abilities. Behav Genet
1979; 9: 505–17.
Knopik, VS, Alarcón, M, DeFries, JC. Comorbidity of mathematics and reading deficits: evidence for a genetic etiology. Behav Genet
1997; 27: 447–53.
Kovas, Y, Haworth, CMA, Dale, PS, Plomin, R. The genetic and environmental origins of learning abilities and disabilities in the early school years. Monogr Soc Res Child Dev
2007; 72: 1–144.
Hoekstra, RA, Bartels, M, Verweij, CJH, Boomsma, DI. Heritability of autistic traits in the general population. Arch Pediatr Adolesc Med
2007; 161: 372–7.
Goin-Kochel, RP, Mazefsky, CA, Riley, BP. Level of functioning in autism spectrum disorders: phenotypic congruence among affected siblings. J Autism Dev Disord
2008; 38: 1019–27.
MacLean, JE, Szatmari, P, Jones, MB, Bryson, SE, Mahoney, WJ, Bartolucci, G, et al. Familial factors influence level of functioning in pervasive developmental disorder. J Am Acad Child Adolesc Psychiatry
1999; 38: 746–53.
Fombonne, E, Bolton, P, Prior, J, Jordan, H, Rutter, M. A family study of autism: cognitive patterns and levels in parents and siblings. J Child Psychol Psychiatry
1997; 38: 667–83.
Folstein, SE, Santangelo, SL, Gilman, SE, Piven, J, Landa, R, Lainhart, J, et al. Predictors of cognitive test patterns in autism families. J Child Psychol Psychiatry
1999; 40: 1117–28.
Szatmari, P, Jones, MB, Holden, J, Bryson, S, Mahoney, W, Tuff, L, et al. High phenotypic correlations among siblings with autism and pervasive developmental disorders. Am J Med Genet 1996; 67: 354–60.
Dawson, M, Souliéres, I, Gernsbacher, MA, Mottron, L. The level and nature of autistic intelligence. Psychol Sci
2007; 18: 657–62.
Scheuffgen, K, Happé, F, Anderson, M, Frith, U. High “intelligence,” low “IQ”? Speed of processing and measured IQ in children with autism. Dev Psychopathol
2000; 12: 83–90.
Lord, C, Risi, S, Lambrecht, L, Cook, EH Jr, Leventhal, BL, DiLavore, PC, et al. The Autism Diagnostic Observation Schedule – Generic: a standard measure of social and communication deficits associated with the spectrum of autism. J Autism Dev Disord
2000; 30: 205–23.
Lord, C, Rutter, M, Le Couleur, A. Autism Diagnostic Interview – Revised: a revised version of a diagnostic interview for caregivers of individuals with possible pervasive developmental disorders. J Autism Dev Disord
1994; 24: 659–85.
Hus, V, Pickles, A, Cook, EH, Risi, S, Lord, C. Using the autism diagnostic interview-revised to increase phenotypic homogeneity in genetic studies of autism. Biol Psychiatry
2007; 61: 438–48.
Georgiades, S, Szatmari, P, Zwaigenbaum, L, Duku, E, Bryson, S, Roberts, W, et al. Structure of the Autism Symptom Phenotype: a proposed multidimensional model. J Am Acad Child Adolesc Psychiatry
2007; 46: 188–96.
Spiker, D, Lotspeich, LJ, Dimiceli, S, Myers, RM, Risch, N. Behavioral phenotypic variation in autism multiplex families: evidence for a continuous severity gradient. Am J Med Genet
2002; 114: 129–36.
Bailey, A, Palferman, S, Heavey, L, Le Couteur, A. Autism: the phenotype in relatives. J Autism Dev Disord
1998; 28: 369–92.
Bishop, DVM, Maybery, M, Wong, D, Maley, A, Hallmayer, J. Characteristics of the broader phenotype in autism: a study of siblings using the children's communication checklist-2. Am J Med Genet B Neuropsychiatr Genet
2006; 141B: 117–22.
Abrahams, BS, Geschwind, DH. Advances in autism genetics: on the threshold of a new neurobiology. Nat Rev Genet
2008; 9: 341–55.
Persico, AM, Bourgeron, T. Searching for ways out of the autism maze: genetic, epigenetic and environmental clues. Trends Neurosci
2006; 29: 349–58.