2.3 Clinical Phenotyping
Intellectual functioning was assessed using the Wechsler Abbreviated
Scales of Intelligence (WASI) (Wechsler, 1999). ASD diagnoses were
confirmed by a licensed clinical psychologist by clinical observation in
conjunction with the Autism Diagnostic Observation Schedule (ADOS) or
ADOS-2 (Lord et al., 2000; Lord et al., 1994). Additional assessments of
social responsiveness and attention were also administered. For a full
account of all neurocognitive procedures and parental questionnaires,
please refer to our previously published work, e.g. (Brandwein et al.,
2015; Brandwein et al., 2013; Brandwein et al., 2011). Participant
handedness was not available for 7 TD participants (8.3%) and 1 ASD
participant (1.9%) included in the final sample. WASI score was not
available for 6 TD participants (7.1%) and 2 ASD participants (2.4%).