Proportional slowing and addition speed in old and young adults

M. Sliwinski, H. Buschke, G. Kuslansky, G. Senior, D. Scarisbrick

Research output: Contribution to journalArticlepeer-review

27 Scopus citations


An addition and copying task was used to compare processing speed in young and old adults. Consistent with previous studies, no age differences in the problem-size effect were observed (Geary and Wiley, 1991). However, the old adults were slower overall, and an analysis of the distributions of old and young individuals indicated that the form of this slowing was proportional. These analyses also demonstrated that proportional slowing was uniform in the old adults, such that the fastest and slowest old individuals were slowed by the same factor. Because the regression of old-young mean response times can be insensitive to differential age effects, comparisons of old and young distributions are recommended to support claims regarding proportional slowing and uniformity of age effects across individuals. Finally, the results suggest that requiring Ss to initiate a new operation produced a larger age effect than requiring Ss to repeat an operation.

Original languageEnglish (US)
Pages (from-to)72-80
Number of pages9
JournalPsychology and aging
Issue number1
StatePublished - Jan 1 1994

All Science Journal Classification (ASJC) codes

  • Social Psychology
  • Aging
  • Geriatrics and Gerontology


Dive into the research topics of 'Proportional slowing and addition speed in old and young adults'. Together they form a unique fingerprint.

Cite this