Origins of individual differences in episodic memory in the oldest-old: a population-based study of identical and same-sex fraternal twins aged 80 and older.


Journal Article

The relative importance of genetic and environmental influences on episodic memory in very late life was studied using a quantitative genetic approach. Identical (n = 125) and same-sex fraternal (n = 157) twin pairs, aged 80 and older (mean age = 83.3; SD = 3.1) and without a diagnosis of dementia were tested with seven memory measures: (1-2) Digit Span Forward and Backwards, (3) Prose Recall, (4) Thurstone's picture memory test, and the Memory in Reality (MIR) test, including the subtasks of (5) free recall, (6) recognition, and (7) relocation. Heritabilities, estimated by structural equation modeling, ranged from .04 to .49. The digit span backward test showed the highest heritability (h2 = .49), while heritabilities were typically lower for the long-term memory measures. The results demonstrate genetic influences on memory in the oldest-old, but suggest that the magnitude of these effects differs across memory measures.

Full Text

Cited Authors

  • Johansson, B; Whitfield, K; Pedersen, NL; Hofer, SM; Ahern, F; McClearn, GE

Published Date

  • May 1999

Published In

Volume / Issue

  • 54 / 3

Start / End Page

  • P173 - P179

PubMed ID

  • 10363039

Pubmed Central ID

  • 10363039

Electronic International Standard Serial Number (EISSN)

  • 1758-5368

International Standard Serial Number (ISSN)

  • 1079-5014

Digital Object Identifier (DOI)

  • 10.1093/geronb/54b.3.p173


  • eng