There are three PhD theses about the Zebra project with younger brothers and sisters of children with autism. The theses are publicly available. You can easily read them online or download them from here:
Predictive Processing Accounts of Autism and Early Development (Emma Ward)
Social-Cognitive Processing and Familial Risk for Autism Spectrum Disorder (Ricarda Braukmann)
Autism in infancy and toddlerhood: Investigating infants at risk and enhancing early detection and intervention (Mirjam Pijl)
There are also multiple published articles. The articles are not all openly accessible, but we are enthusiastic about sharing our research with interested people. If you would like a copy of an article (or more than one), please feel free to send me an email: e [dot] k [dot] ward [@] ucl [dot] ac [dot] uk
Menn, K. H., Ward, E. K. , Braukmann, R., van den Boomen, C., Buitelaar, J., Hunnius, S. & Snijders, T. M. (2022) Neural tracking in infancy predicts language development in children with and without family history of autism. Neurobiology of Language, 3(3), 495-514.
van Rooijen, R., Ward, E.K., de Jonge, M., Kemner, C. & Junge, C. (2021) Two-year-olds at risk for autism can learn novel words from their parents. Journal of Child Language.
Ward, E. K., Buitelaar, J. K. & Hunnius, S. (2021) Implicit learning in three-year-olds with high and low likelihood of autism shows no evidence of precision weighting differences. Developmental Science.
Ward, E. K., Braukmann, R., Weiland, R., Bekkering, H., Buitelaar, J. K. & Hunnius, S. (2021) Action predictability is reflected in beta power attenuation and predictive eye movements in adolescents with and without autism. Neuropsychologia, 157, 107859.
Ward, E. K., Braukmann, R., Buitelaar, J. K., & Hunnius, S. (2020). No evidence for neural markers of gaze direction adaptation in 2-year-olds with high or low likelihood of autism. Journal of Abnormal Psychology, 129(6), 612–623.
Di Lorenzo, R., Munsters, N., Ward, E.K., de Jonge, M., Kemner, C. & van den Boomen, C. (2020). Is it fear? Similar brain responses to fearful and neutral faces in infants with a heightened likelihood for Autism Spectrum Disorder. Journal of Autism and Developmental Disorders, 51 (3), 961-972.
Bussu, G., Jones, E. J., Charman, T., Johnson, M. H., Buitelaar, J. K., & BASIS Team. (2019). Latent trajectories of adaptive behaviour in infants at high and low familial risk for autism spectrum disorder. Molecular autism, 10(1), 13.
Pijl, M. K. J., Bussu, G., Charman, T., Johnson, M. H., Jones, E. J., Pasco, G., ... & BASIS Team. (2019). Temperament as an early risk marker for Autism Spectrum Disorders? A longitudinal study of high-risk and low-risk infants. Journal of autism and developmental disorders, 49(5), 1825-1836.
Jones, E. J., Mason, L., Ali, J. B., van den Boomen, C., Braukmann, R., Cauvet, E., ... & Bolte, S. (2019). Eurosibs: Towards robust measurement of infant neurocognitive predictors of autism across Europe. Infant Behavior and Development, 57, 101316.
Braukmann, R., Ward, E., Hessels, R. S., Bekkering, H., Buitelaar, J. K., & Hunnius, S. (2018). Action prediction in 10-month-old infants at high and low familial risk for Autism Spectrum Disorder. Research in Autism Spectrum Disorders, 49, 34-46.
Bussu, G., Jones, E. J., Charman, T., Johnson, M. H., Buitelaar, J. K., & BASIS Team. (2018). Prediction of autism at 3 years from behavioural and developmental measures in high-risk infants: a longitudinal cross-domain classifier analysis. Journal of autism and developmental disorders, 48(7), 2418-2433.