Restoration of fMRI Decodability Does Not Imply Latent Working Memory States.
Restoration of fMRI Decodability Does Not Imply Latent Working Memory States.
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DOI:
10.1162/jocn_a_01180
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发表时间:
2017-12
影响因子:
3.2
通讯作者:
Bays PM
中科院分区:
文献类型:
--
作者:
Schneegans S;Bays PM
Recent imaging studies have challenged the prevailing view that working memory is mediated by sustained neural activity. Using machine learning methods to reconstruct memory content, these studies found that previously diminished representations can be restored by retrospective cueing or other forms of stimulation. These findings have been interpreted as evidence for an activity-silent working memory state that can be reactivated dependent on task demands. Here, we test the validity of this conclusion by formulating a neural process model of working memory based on sustained activity and using this model to emulate a spatial recall task with retrocueing. The simulation reproduces both behavioral and fMRI results previously taken as evidence for latent states, in particular the restoration of spatial reconstruction quality following an informative cue. Our results demonstrate that recovery of the decodability of an imaging signal does not provide compelling evidence for an activity-silent working memory state.
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影响因子:
1.8
作者:
Bays PM;Catalao RF;Husain M
通讯作者:
Husain M
影响因子:
3.2
作者:
Erickson MA;Maramara LA;Lisman J
通讯作者:
Lisman J
影响因子:
56.9
作者:
FUSTER, JM;ALEXANDER, GE
通讯作者:
ALEXANDER, GE
DOI:
10.1073/pnas.1117386109
发表时间:
2012-10-23
影响因子:
11.1
作者:
Burak, Yoram;Fiete, Ila R.
通讯作者:
Fiete, Ila R.
影响因子:
2.6
作者:
Johnson JS;Spencer JP;Schöner G
通讯作者:
Schöner G