Response times (RTs) however are often longer compared to younger adults, possibly because older adults are slower in accessing and retrieving conceptual representations from their semantic store, engaging the required executive function resources, and necessary motor responses. Performance in terms of accuracy in semantic tasks is generally well maintained in older adults considering their more extensive experience with word use and a larger vocabulary than younger adults. When compared with attention or memory, the relative preservation of language throughout lifetime could be justified by the necessity to maintain successful communication, resulting in compensatory, flexible or atypical recruitment of neural resources. Language overall is well preserved in aging and semantic memory may even improve across the lifespan, despite numerous neurophysiological declines in other cognitive domains that occur in the aging brain. Data access requests can be made at: Unité de Neuroimagerie Fonctionnelle (UNF) Centre de Recherche de l’institut Universitaire de Gériatrie de Montréal 4565 Queen-Mary Road.įunding: The study was funded by the Canadian Institutes of Health Research (CIHR).Ĭompeting interests: The authors have declared that no competing interests exist. These will remain stored in a private server, accessible on demand and following ethics committee approval. Though the authors intend to make their raw data publicly available, ethical regulations at our institute do not allow for sharing of raw data at the moment, due to privacy risks for the human subjects and risk of re-identification (data contain potentially identifying information). Permanent links to the unthresholded statistical maps to be uploaded at Neurovault will be provided as part of the dataset deposited on the OSF, under the same DOI (DOI: 10.17605/OSF.IO/F2XW9). In addition, once they become available, we will upload our unthresholded statistical maps to neurovault ( ), an online platform sharing activation data. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.ĭata Availability: All related data (stimuli, instructions, ethics’ approval) are in the osf.io platform (doi: 10.17605/OSF.IO/F2XW9). Received: AugAccepted: MaPublished: June 15, 2021Ĭopyright: © 2021 Haitas et al. PLoS ONE 16(6):Įditor: Anna Manelis, University of Pittsburgh, UNITED STATES high-demand conditions manifested in semantic control Regions of Interest.Ĭitation: Haitas N, Amiri M, Wilson M, Joanette Y, Steffener J (2021) Age-preserved semantic memory and the CRUNCH effect manifested as differential semantic control networks: An fMRI study. In line with the CRUNCH predictions, differences in neurofunctional activation and behavioral performance (accuracy and response times) are expected in young vs. This study will compare 40 young (20–35 years old) with 40 older participants (60–75 years old) in a triad-based semantic judgment task performed in an fMRI scanner while manipulating levels of task demands (low vs. ![]() ![]() The CRUNCH effect would manifest itself in semantic tasks through a compensatory increase in neural activation in semantic control network regions but only up to a certain threshold of task demands. To explain this phenomenon, this study aims to test the predictions of the Compensation Related Utilization of Neural Circuits Hypothesis (CRUNCH) focusing on task demands in aging as a possible framework. Semantic memory representations are overall well-maintained in aging whereas semantic control is thought to be more affected.
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