Facial expression analysis
psychiatric
In addition to clinical assessments, behavioural changes were estimated from facial expressions extracted from weekly videos of participants collected during the weekly psychiatric clinical interviews where LFPs were recorded, and DBS management, including dose changes, was determined. Videos were recorded using a static, tripod-mounted video camera recording at 30 frames per second. The sessions lasted approximately 30 min.Videos were partitioned into 5-min windows for feature generation, with the remainder discarded. Each window was processed with the OpenFace facial behaviour analysis toolkit v.2.0 (ref. Using the same rationale as for the LFP classification, the facial expression features most differentially expressed between the ‘sick’ (weeks 1–4) and ‘stable response’ (weeks 21−24) states were identified using a paired two-sided 