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Path integration selectively predicts midlife risk of Alzheimer's disease

Newton, C.; Pope, M.; Rua, C.; Henson, R.; Ji, Z.; Burgess, N.; Rodgers, C. T.; Stangl, M.; Dounavi, M.-E.; Castegnaro, A.; Koychev, I.; Malhotra, P.; Wolbers, T.; Ritchie, K.; Ritchie, C.; O'Brien, J.; Su, L.; Chan, D.

2023-02-03 neuroscience
10.1101/2023.01.31.526473 bioRxiv
Show abstract

The entorhinal cortex (EC) is the first cortical region to exhibit neurodegeneration in Alzheimers disease (AD), associated with EC grid cell dysfunction. Given the role of grid cells in path integration, we predicted that path integration impairment would represent the first behavioural change in adults at-risk of AD. Using immersive virtual reality, we found that midlife path integration impairments predicted both hereditary and physiological AD risk, with no corresponding impairment on tests of episodic memory or other spatial behaviours. Impairments related to poorer angular estimation and were associated with hexadirectional grid-like fMRI signal in the posterior-medial EC. These results indicate that altered path integration may represent the transition point from at-risk state to disease onset in AD, prior to impairment in other cognitive domains.

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