Title of dataset: Data_Study2

Contact details: Deborah Talamonti, Montreal Heart Institute, Research Centre and Centre EPIC, Montreal, QC H1T 1N6, Canada, tel: +(1) 514 374 1480, extension 4321, email: deborah.talamonti@icm-mhi.org

File name structure: each column represents a variable - each row represents a participant's data

File formats: .xlxs

Column headings for tabular data: ID	age	Sex	Group1	MOCA	PHQ	STAI	ed	CRI	tmtA	tmtA_error	tmtB	tmtB_error	TMT_AB	digit_forward	digit_backward	digit_total	DSS	STeM_tot	Temp_F	Temp_C	Temp_A	Temp_V	Temp_Average	Spat_F	Spat_C	Spat_A	Spat_V	Spat_Average	adjust_temp_X	adjust_spat_X

Data and file overview, short description of what the file contains, when and how it was created:
ID = participants ID code
Age = participants age in years
Sex = Participants biological sex (1=male; 2=female)
Group1 = Assigned group (0=younger group; 1=older group)
MOCA = Total score at the Montreal Cognitive Assessment, adjusted for level of education (measure of cognitive functioning)
PHQ = Patient Health Questionnaire-9 (measure of depression)
STAI = State-Trait Anxiety Inventory- Form Y (measure of anxiety)
ed = level of education in years
CRI = Cognitive Reserve Index (measure of cognitive reserve)
tmtA = Trail Making Test-A (in seconds)
tmtA_error = number of errors during the TMT-A
tmtB = Trail Making Test-B (in seconds)
tmtB_error = number of errors during the TMT-B
TMT_AB = TMT B/A
digit_forward = Digit-Span forward
digit_backward = Digit-Span backward
digit_total = Digit-Span Total
DSS = Digit Symbol Substitution 
STeM_Tot = Spatio-Temporal Memory test (total recall)
Temp_F = temporal factor - Trial 1 (Fruits)
Temp_C = temporal factor - Trial 2 (items of clothing)
Temp_A = temporal factor - Trial 3 (Animals)
Temp_V = temporal factor - Trial 4 (Vegetables)
Temp_Average = temporal factor - Averaged Trials
Spat_F = spatial factor - Trial 1 (Fruits)
Spat_C = spatial factor - Trial 2 (items of clothing)
Spat_A = spatial factor - Trial 3 (Animals)
Spat_V = spatial factor - Trial 4 (Vegetables)
Spat_Average = spatial factor - Averaged Trials
adjust_temp_X = temporal factor adjusted by chance
adjust_spat_X = spatial factor adjusted by chance

Dataset created in 2017 as part of D.T. doctoral project. 
Data respository created for manuscript's publication, titled "Age differences for spatial and temporal clustering in episodic memory", abstract:
Older adults typically perform more poorly than younger adults in free recall memory tests. This age-related deficit was investigated in the present study by exploring whether the use of specific memory associations (i.e., temporal vs. spatial clustering) was influenced by age differences. Memory performance was compared between 45 younger and 45 older participants on a free recall task, where either a temporal or spatial strategy (but not both simultaneously) could be employed to retrieve distinct lists of stimuli. The results showed that whilst both groups showed a preference for temporal clustering, younger adults used greater temporal clustering compared to the older group. Our findings support the notion that whilst remaining the preferred strategy for memory performance, temporal organization in memory is affected by ageing. Future research may consider whether loss of temporal organization in older adults may be an early sign of medial-temporal and prefrontal lobe pathology and possible neurodegeneration.
Keywords: memory; temporal clustering; spatial clustering; older adults; cognitive decline.