The role of the hippocampus in weighting expectations during inference under uncertainty
The role of the hippocampus in weighting expectations during inference under uncertainty
复制标题
海马体在不确定性推理过程中加权期望的作用
DOI:
10.1016/j.cortex.2019.01.005
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发表时间:
2019
期刊:
影响因子:
--
通讯作者:
Dolan RJ
中科院分区:
文献类型:
--
作者:
Rigoli F;Michely J;Friston KJ;Dolan RJ
Making inference under uncertainty requires an optimal weighting of prior expectations and observations. How this weighting is realized in the brain remains elusive. To investigate this, we recorded functional neuroimaging data while participants estimated a number based on noisy observations. Crucially, the prior expectation about the variability of observations (an expected variability) was manipulated. Consistent with normative models, when novel observations were characterized by higher expected or observed variability, participants' estimates relied more on expectations than novel observations and were characterized by higher stochasticity. Activity in hippocampus increased when novel evidence was characterized by higher expected or observed variability. Response in superior parietal cortex reflected a precision-weighted prediction error signal (i.e., the distance between observations and expectations) that was modulated by hippocampal activity. Our findings implicate the hippocampus during inference under uncertainty, suggesting a role in weighting prior representations over observations and in modulating responsivity of superior parietal cortex to prediction error.
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