2.2. Environment and equipment
The study was conducted at the Autism Treatment Center of America (Sheffield, Massachusetts) where each child (both
experimental and control) resided, together with their parents, for a 13-day period in small apartments designed for delivery of
intensive SRP. All families travelled at least 100 miles from their homes to participate in the study. Each apartment included a
child’s playroom, equipped with age appropriate equipment (i.e., a small table and chairs and a small structure for climbing) and
toys (situated on a shelf, visible but out of reach the children’s reach). One wall of the playroom was a two-way mirror, allowing
for direct observation of intervention sessions. In addition, cameras mounted in the four corners of the room recorded all passive
interaction probe sessions (see Section 2.3). All SRP intervention took place in the playroom of each apartment