Abstract
Ten measures of speed of processing were administered to 157 individuals, aged 18 to 89 years. The 10 measures comprised five pairs, each of which had a paper-and-pencil and a computer, reaction time (RT) based version of the same measure. Three measures of working memory span were also administered. Two structural equation models were fit to the speed data, one with a single latent variable, speed, and another, nested-factor model in which there were also latent variables for the two methods of measurement. The model with the method latent variables provided a better fit. Age was more strongly related to the method latent variables than to the general speed latent variable. Adding the working memory measures showed that there was also shared variance in those measures beyond the general latent variable, also related to age. The results show that any single measure of speed includes variance due to speed but also to the method of measurement. Use of a latent variable approach to speed is recommended.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
