View-Independent Working Memory Representations of Artificial Shapes in Prefrontal and Posterior Regions of the Human Brain

Cerebral Cortex
Thomas B ChristophelJohn-Dylan Haynes

Abstract

Traditional views of visual working memory postulate that memorized contents are stored in dorsolateral prefrontal cortex using an adaptive and flexible code. In contrast, recent studies proposed that contents are maintained by posterior brain areas using codes akin to perceptual representations. An important question is whether this reflects a difference in the level of abstraction between posterior and prefrontal representations. Here, we investigated whether neural representations of visual working memory contents are view-independent, as indicated by rotation-invariance. Using functional magnetic resonance imaging and multivariate pattern analyses, we show that when subjects memorize complex shapes, both posterior and frontal brain regions maintain the memorized contents using a rotation-invariant code. Importantly, we found the representations in frontal cortex to be localized to the frontal eye fields rather than dorsolateral prefrontal cortices. Thus, our results give evidence for the view-independent storage of complex shapes in distributed representations across posterior and frontal brain regions.

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Citations

Mar 7, 2018·Nature Neuroscience·Thomas B ChristophelJohn-Dylan Haynes
Feb 23, 2020·NeuroImage·Ediz SohogluTimothy D Griffiths
Aug 10, 2021·Frontiers in Neural Circuits·Clayton E Curtis, Thomas C Sprague
Aug 26, 2021·Cell Reports·Fahimeh MamashliJyrki Ahveninen

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