Table 1.

Overview of inclusion and exclusion criteria

Inclusion criterion	Measured with	Defined by
Significant subjective cognitive complaints	Parkinson’s Disease Cognitive Functional Rating Scale	Score > 3
Mild to moderate disease stage	Hoehn & Yahr disease stage	Score < 4
Access to computer or tablet with access to Internet. Capability to use keyboard and computer mouse	Phone interview	–
Signed informed consent	–	–
General exclusion criterion	Measured with	Defined by
Indication for dementia syndrome	Self-administered Gerocognitive Examination	Score < 14
	Montreal Cognitive Assessment	Score < 22
Current drug- or alcohol abuse	CAGE AID-interview	Score > 1
Inability to undergo extensive neuropsychological assessments or eight weeks of home-based cognitive intervention	–	–
Moderate to severe depressive symptoms	Beck depression inventory	Score > 18
Presence of one or more impulse control disorders	ICD criteria interview	Positive screening
Psychotic symptoms. Benign hallucinations with insight are not an exclusion criterion	Schedule for Assessment of Positive Symptoms – PD	Positive screening
Traumatic brain injury	Phone interview	Cerebral contusion with 1) loss of consciousness for > 15 min and 2) posttraumatic amnesia > 1 h
Exclusion criterion for participation in magnetic resonance imaging	Measured with	Defined by
A space occupying lesion	Assessment by radiologist	–
Significant vascular abnormalities	Assessment by radiologist	Fazekas > 1
Severe claustrophobia	MRI safety screening questionnaire	Positive screening
Presence of metal in the body (e.g. pacemaker, neurostimulator)
Pregnancy
Difficulty with, or shortness of breath during 60 min of lying still