Table 1.

Behavior and fMRI studies of recognition memory in PD

Study	Task used	Finding		No. of Participants Mean Age	Mean Disease Duration (years)	PD and Dementia Diagnostic Criteria	Major Clinical Assessment Tools
		Recollection	Familiarity
Davidson et al., 2006	Yes-no recognition memory test and remember-know-new judgement	No significant impairmentin PD	Impaired in PD	19 PD 66.56 (experiment1), 16 PD 67.05 (experiment 2)	5.79 6.13	Criteria for PD diagnosis not specified	MMSE MHV
Edelstyn et al., 2007	Yes-no recognition memory test and remember-know judgement	Impaired in PD	Unimpaired in PD	17 PD 65.4	8.6	Criteria for PD diagnosis not specified	MMSE NART WAIS WR
Cohn et al.,2010	Noun-noun pairs recognition memory test, deep and shallow encoded	Impaired at deep encoding in PD	Impaired at shallow encoding in PD	11 PD 67	6.4	Criteria for PD diagnosis not specified	MMSE
Algarabel et al., 2010	Yes-no recognition memory test	Impaired in PDD and Advanced PD	Impaired only in PDD	20 Early PD 72.55 19 Advanced PD 75.58 10 PD Dementia 80.00	3.22 10.95 6.72	-PD diagnosis: UK Brain Bank Criteria -Dementia diagnosis based on DSM-IV criteria	MMSE BNT WMS TMT-A
Weiermann et al., 2010	Yes-no recognition memory for high and low frequency words; remember-know judgement	Unimpaired for high frequency words in PD	Poorer sensitivity index d’ for familiarity in PD	14 PD 63.2	9.43	Criteria for PD diagnosis not specified	MMSE Verbal Intelligence (NART)
Rodriguez et al., 2014	Word pairs recognition memory test, 2-alternative- forced-choice test	Impaired in PD	Unimpaired in PD	20 PD 71.45	5.32	- PD diagnosis: UK Brain Bank Criteria -Dementia diagnosis based on MDS criteria (Emre et al., 2007) - Dementia was exclusion criteria	MMSE
Cohn et al., 2016†	Associative Reinstatement Memory Task: fMRI study	Impaired with decreased hippocampa l activation	Unimpaired in PD	6 PD-noMCI 9 multidomain PD-MCI 59.1	6.20	-PD diagnosis: UK Brain Bank Criteria -MCI diagnosis based on MDS level 2 criteria (Litvan et al., 2012)	MoCA Color TMT- A and B WAIS HVLT-R Category Fluency- Animals
Pitarque et al., 2017	Face-scene picture pairs recognition memory test	Impaired in PD	Unimpaired in PD	32 non- demented PD 69.63	Not available	- PD diagnosis: UK Brain Bank Criteria -Criteria for Dementia diagnosis not specified -Dementia was exclusion criteria	MMSE WAIS Vocabulary

Abbreviations: PDD: PD Dementia, MMSE: Mini-Mental State Examination, NART: The National Adult Reading Test, MHV: Mill Hill Vocabulary, WAIS: Wechsler Abbreviated Intelligence Scales, WR: Warrington Recognition, BNT: Boston Naming Test, WMS: Wechsler Memory Scale, TMT: Trail Making Test, MoCA: Montreal Cognitive Assessment, HVLT-R: Hopkins Verbal Learning Test-Revised MDS: Movement Disorders

^†All studies use behavioral methods except Cohn et al., 2016, which is an fMRI study.