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Contribution of child development, biological aging, and beta-amyloid to cognitive function of the Louisville twins at midlife

Award Number: R01AG063949
ORGANIZATION: NATIONAL INSTITUTE ON AGING
OPDIV: NIH
AWARD CLASS: DISCRETIONARY
AWARD ACTIVITY TYPE: SCIENTIFIC/HEALTH RESEARCH (INCLUDES SURVEYS)

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Project Summary/Abstract The overarching aim of our current funding (NIH Grant # R01 AG063949-01) is to repurpose the Louisville Twin Study’s original goal of understanding the etiology of child cognitive development into a true lifespan developmental twin study of cognition, including delineation of the etiology of preclinical symptoms of Alzheimer’s disease and related dementias. In the current project period, the third independent aim encompasses modeling effects of cognitive development on cognitive functioning in midlife, adjusting for confounding genetic and environmental factors. Throughout the life of the Louisville Twin Study (LTS), however, recorded ability scores have been age standardized, thus making it impossible to estimate effects of true intraindividual change in cognitive ability over any period of development. Problems with the age- standardized approach are compounded by the administration of different tests (e.g., moving from the Wechsler Intelligence Scale for Children (WISC) to the Wechsler Adult Intelligence Scale (WAIS)) and test editions (e.g., updating from the WAIS-III to the WAIS-IV) that supposedly measure the same latent cognitive abilities. Whether they actually do so is an empirical question that has not been addressed previously in any longitudinal twin study of cognitive ability. All LTS twins’ cognitive ability protocols are available, so individual items could be used in future analyses. We propose using vertical linking methods that allow the administration of validated cognitive tasks without requiring age-standardizing cognitive test scores. Child and adult test content typically is not the same, but there are some items that were administered in childhood that can be retained in adult tests. For the current data collection, three age-appropriate items from the WISC Block Design, Similarities, Vocabulary, Arithmetic, and Information subtests will be administered to all returning LTS adults (projected N = 750). As children, LTS twins completed approximately 10 cognitive ability tests, on average, half of which were WISC tests. With an estimated five WISC protocols administered to each twin, on average, there are greater than 73,000 individual subtests to archive and vertically link child and adult Wechsler ability scores. Item Response Theory models subsequently can be used to place ability scores on the same scale so that ability trends can be studied and compared across different periods of child and adult development. Twins’ latent cognitive ability test scores, thus, will be put on the same scale from age 7 through midlife. Our efforts in the LTS are the first of its kind in longitudinal twin studies of cognitive ability. By linking childhood cognitive tests to adult tests, we will increase the significance and innovation of our findings by specifying the lifespan growth functions of ability at the subtest and latent factor levels to model individual twins’ true intraindividual cognitive ability trajectories.


Issue Date FY	Funding FY	Legal Entity Name	Legal Entity Address	Legal Entity City	Legal Entity State	Legal Entity Zip Code	Legal Entity COUNTY	Legal Entity COUNTRY	Assistance Listing	Award Code	Budget Year	Action Date	Action Type	Action Amount

Issue Date FY: 2024 ( Subtotal = $68,001 )
2024	2024	UNIVERSITY OF SOUTHERN CALIFORNIA	3720 S FLOWER ST	LOS ANGELES	CA	90089	LOS ANGELES	USA	Aging Research	000	5	11/30/2023	SUPPLEMENT FOR EXPANSION	$39,871
2024	2024	UNIVERSITY OF SOUTHERN CALIFORNIA	3720 S FLOWER ST	LOS ANGELES	CA	90089	LOS ANGELES	USA	Aging Research	001	5	12/4/2023	SUPPLEMENT FOR EXPANSION	$28,130
														Subtotal = $68,001

Issue Date FY: 2023 ( Subtotal = $976,313 )
2023	2023	UNIVERSITY OF SOUTHERN CALIFORNIA	3720 S FLOWER ST	LOS ANGELES	CA	90089	LOS ANGELES	USA	Aging Research	001	5	5/23/2023	NON-COMPETING CONTINUATION	$858,853
2023	2023	UNIVERSITY OF SOUTHERN CALIFORNIA	3720 S FLOWER ST	LOS ANGELES	CA	90089	LOS ANGELES	USA	Aging Research	003	5	5/25/2023	SUPPLEMENT FOR EXPANSION	$47,058
2023	2023	UNIVERSITY OF SOUTHERN CALIFORNIA	3720 S FLOWER ST	LOS ANGELES	CA	90089	LOS ANGELES	USA	Aging Research	002	5	5/24/2023	SUPPLEMENT FOR EXPANSION	$23,344
2023	2023	UNIVERSITY OF SOUTHERN CALIFORNIA	3720 S FLOWER ST	LOS ANGELES	CA	90089	LOS ANGELES	USA	Aging Research	000	4	11/26/2022	SUPPLEMENT FOR EXPANSION	$47,058
														Subtotal = $976,313

Issue Date FY: 2022 ( Subtotal = $1,066,427 )
2022	2022	UNIVERSITY OF SOUTHERN CALIFORNIA	3720 S FLOWER ST FL 3	LOS ANGELES	CA	90007	LOS ANGELES	USA	Aging Research	001	4	7/26/2022	SUPPLEMENT FOR EXPANSION	$70,029
2022	2022	UNIVERSITY OF SOUTHERN CALIFORNIA	3720 S FLOWER ST FL 3	LOS ANGELES	CA	90007	LOS ANGELES	USA	Aging Research	000	4	5/23/2022	NON-COMPETING CONTINUATION	$996,398
														Subtotal = $1,066,427

Issue Date FY: 2021 ( Subtotal = $1,370,234 )
2021	2021	UNIVERSITY OF SOUTHERN CALIFORNIA	3720 S FLOWER ST FL 3	LOS ANGELES	CA	90007	LOS ANGELES	USA	Aging Research	000	2	2/25/2021	SUPPLEMENT FOR EXPANSION	$67,839
2021	2021	UNIVERSITY OF SOUTHERN CALIFORNIA	3720 S FLOWER ST FL 3	LOS ANGELES	CA	90007	LOS ANGELES	USA	Aging Research	003	3	6/30/2021	NON-COMPETING CONTINUATION	$44,095
2021	2021	UNIVERSITY OF SOUTHERN CALIFORNIA	3720 S FLOWER ST FL 3	LOS ANGELES	CA	90007	LOS ANGELES	USA	Aging Research	002	3	5/24/2021	NON-COMPETING CONTINUATION	$1,214,205
2021	2021	UNIVERSITY OF SOUTHERN CALIFORNIA	3720 S FLOWER ST FL 3	LOS ANGELES	CA	90007	LOS ANGELES	USA	Aging Research	001	2	5/10/2021	SUPPLEMENT FOR EXPANSION	$44,095
														Subtotal = $1,370,234

Issue Date FY: 2020 ( Subtotal = $1,095,034 )
2020	2020	UNIVERSITY OF SOUTHERN CALIFORNIA	3720 S FLOWER ST FL 3	LOS ANGELES	CA	90007	LOS ANGELES	USA	Aging Research	000	2	6/10/2020	NON-COMPETING CONTINUATION	$1,095,034
														Subtotal = $1,095,034

Issue Date FY: 2019 ( Subtotal = $1,138,735 )
2019	2019	UNIVERSITY OF SOUTHERN CALIFORNIA	3720 S FLOWER ST FL 3	LOS ANGELES	CA	90007	LOS ANGELES	USA	Aging Research	000	1	8/28/2019	NEW	$1,138,735
2019	2019	UNIVERSITY OF SOUTHERN CALIFORNIA	3720 S FLOWER ST FL 3	LOS ANGELES	CA	90007	LOS ANGELES	USA	Aging Research	002	1	9/14/2019	NEW	$0
2019	2019	UNIVERSITY OF SOUTHERN CALIFORNIA	3720 S FLOWER ST FL 3	LOS ANGELES	CA	90007	LOS ANGELES	USA	Aging Research	001	1	9/12/2019	NEW	$0
														Subtotal = $1,138,735

Grand Total All Awards = $5,714,744

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Contribution of child development, biological aging, and beta-amyloid to cognitive function of the Louisville twins at midlife

Award Number: R01AG063949

ORGANIZATION: NATIONAL INSTITUTE ON AGING

OPDIV: NIH

AWARD CLASS: DISCRETIONARY

AWARD ACTIVITY TYPE: SCIENTIFIC/HEALTH RESEARCH (INCLUDES SURVEYS)

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