AI Article Synopsis
- The study compared attention-related reaction times (RT) and intra-individual variability (IIV) between younger and older adults using a visual search test on an iPad.
- Older adults showed slower RT and greater IIV overall, but the first response in the series was notably slower and more variable than subsequent responses.
- When analyzing data without the first stimulus response, older adults still had slower RT but their IIV was similar to younger adults, highlighting how research methods can influence findings on aging and cognitive variability.
Article Abstract
In this study we examined attention-related reaction time (RT) and intra-individual variability (IIV) in younger and older adults using an iPad-based visual search test, in which, for each trial, participants were required to sequentially press a series of on-screen stimuli numbered from 1 to 8. Although overall performance RT was significantly slower, with greater IIV for the older compared to the younger adult group, there was also a disproportionately slowed RT and greater IIV for the first item in the series compared to all other responses within the trial. When the response to the first stimulus was removed from statistical analysis, the significant age-related RT slowing effect remained, but IIV was no longer significantly greater for the older compared to the younger adults. This pattern of results reveals a dichotomy between the preservation of RT and IIV in aging, and one that is strongly related to research methodology. A finding that may account, at least in part, for the outcome heterogeneity in the study of IIV in aging.
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