Original Research ARTICLE
Compensation of trial-to-trial latency jitter reveals the parietal retrieval success effect to be both variable and thresholded in older adults
- 1University of Stirling, United Kingdom
- 2The University of Hong Kong, Hong Kong
Although the neural mechanism supporting episodic recollection has been well characterized in younger adults, exactly how recollection is supported in older adults remains unclear. The electrophysiological correlate of recollection – the parietal retrieval success effect – for example, has been shown to be sensitive to both the amount of information recollected and the accuracy of remembered information in younger adults. To date, there is mixed evidence that parietal effect also scales with the amount of information remembered in older adults whilst there is little evidence that the same mechanism is sensitive to the accuracy of recollected information. Here, we address one potential concern when investigating Event Related Potentials (ERPs) among older adults – namely, the greater potential for single trial latency variability to smear and reduces the amplitudes of averaged ERPs. We apply a well-established algorithm for correcting single trial latency variability, Residual Iteration Decomposition Analysis (RIDE), to investigate whether the parietal retrieval success effect among older adults is sensitive to retrieval accuracy. Our results reveal that, similar to younger adults, older adult parietal retrieval success effects scale with the accuracy of recollected information – i.e., is greater in magnitude when recollected information is of high accuracy, reduced in magnitude when accuracy is low, and entirely absent when guessing. The results help clarify the functional significance of the neural mechanism supporting recollection in older adults whilst also highlighting the potential issues with interpreting average ERPs in older adult populations.
Keywords: cognitive ageing, Recollection, Parietal ERP effect, Retrieval accuracy, Residual iteration decomposition
Received: 12 Feb 2019;
Accepted: 02 Jul 2019.
Edited by:Rubem C. Guedes, Federal University of Pernambuco, Brazil
Reviewed by:Jeffrey D. Johnson, University of Missouri, United States
Marianne A. De Chastelaine, The University of Texas at Dallas, United States
Copyright: © 2019 Murray, Ouyang and Donaldson. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence: Dr. Jamie G. Murray, University of Stirling, Stirling, United Kingdom, email@example.com