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Efficacy of navigation may be influenced by retrosplenial cortex-mediated learning of landmark stability.

Abstract：

:Human beings differ considerably in their ability to orient and navigate within the environment, but it has been difficult to determine specific causes of these individual differences. Permanent, stable landmarks are thought to be crucial for building a mental representation of an environment. Poor, compared to good, navigators have been shown to have difficulty identifying permanent landmarks, with a concomitant reduction in functional MRI (fMRI) activity in the retrosplenial cortex. However, a clear association between navigation ability and the learning of permanent landmarks has not been established. Here we tested for such a link. We had participants learn a virtual reality environment by repeatedly moving through it during fMRI scanning. The environment contained landmarks of which participants had no prior experience, some of which remained fixed in their locations while others changed position each time they were seen. After the fMRI learning phase, we divided participants into good and poor navigators based on their ability to find their way in the environment. The groups were closely matched on a range of cognitive and structural brain measures. Examination of the learning phase during scanning revealed that, while good and poor navigators learned to recognise the environment's landmarks at a similar rate, poor navigators were impaired at registering whether landmarks were stable or transient, and this was associated with reduced engagement of the retrosplenial cortex. Moreover, a mediation analysis showed that there was a significant effect of landmark permanence learning on navigation performance mediated through retrosplenial cortex activity. We conclude that a diminished ability to process landmark permanence may be a contributory factor to sub-optimal navigation, and could be related to the level of retrosplenial cortex engagement.

journal_name

Neuropsychologia

journal_title

Neuropsychologia

authors

Auger SD,Zeidman P,Maguire EA

doi

10.1016/j.neuropsychologia.2017.08.012

subject

Has Abstract

pub_date

2017-09-01 00:00:00

pages

102-112

eissn

0028-3932

issn

1873-3514

pii

S0028-3932(17)30306-8

journal_volume

104

pub_type

杂志文章

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Efficacy of navigation may be influenced by retrosplenial cortex-mediated learning of landmark stability.