Comment on "How Many Causes Are There of Aging-Related Decrements in Cognitive Functioning?"

Research output: Contribution to journalArticlepeer-review


Salthouse (1994) introduces a new type of correlation, termed the quasi-partial correlation (QPC). The QPC reflects the amount of age-related variance that is shared by two variables. In this commentary it is argued that the QPC is a model where age is a suitable proxy for time, change over time is linear, and causation is instantaneous or nearly instantaneous. Where these assumptions are reasonable, QPC′s are a highly valuable research tool. It is also argued that the "causes" of decline identified by Salthouse might be termed "dimensions" of decline instead, because the analysis did not include independently assessed causal variables. Finally, it is suggested that age is unsatisfying as a predictor of change across the lifespan.

Original languageEnglish (US)
Pages (from-to)438-443
Number of pages6
JournalDevelopmental Review
Issue number4
StatePublished - Dec 1994

ASJC Scopus subject areas

  • Pediatrics, Perinatology, and Child Health
  • Experimental and Cognitive Psychology
  • Education
  • Developmental and Educational Psychology
  • Psychiatry and Mental health


Dive into the research topics of 'Comment on "How Many Causes Are There of Aging-Related Decrements in Cognitive Functioning?"'. Together they form a unique fingerprint.

Cite this