Table 1. Overview study procedures.

Procedures (time needed)	Baseline visit (V1)	First treatment visit (T1)	Additional treatment visits (T2 up to T14)	Post-treatment visit (V2)	Follow-up visit (V3)
Medical history*	X
Physical health*	X				X
Current medication use*	X	X	X	X	X
Clinical Frailty Scale*	X
Sensation questionnaire (5 min)		X		X
Blinding and subjective treatment experience (1 min)		X		X
Feasibility questionnaire (5 min)		X
Delirium interview (10 min)	X
ICDSC (10 min)	X	X	X	X
DOSS (5 min)†	X	X	X	X
TICS-M (10 min)					X
EEG (40 min)	X‡	X		X
tACS (30 min)		X	X
Estimated total duration	25 or 60 min‡	95 min	45 min	65 min	15 min

^*This information will be recorded as part of standard clinical care, and missing information will be requested via family and will therefore not require additional time.

^†Only non-intensive care unit () patients will be assessed using the DOSS.

^‡Only the group randomised to personalised tACS will receive an EEG during the baseline visit.

DOSS, Delirium Observation Screening Scale; EEG, ElectroencephalogramICDSC, Intensive Care Delirium Screening Checklist; tACStranscranial altering current stimulationTICS-M, Telephone Interview for Cognitive status, modified version