2022
DOI: 10.1101/2022.09.02.506349
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A recurrent neural network model of prefrontal brain activity during a working memory task

Abstract: When multiple items are held in short-term memory, cues that retrospectively prioritise one item over another (retro-cues) can facilitate subsequent recall. However, the neural and computational underpinnings of this effect are poorly understood. One recent study recorded neural signals in the macaque lateral prefrontal cortex (LPFC) during a retro-cueing task, contrasting delay-period activity before (pre-cue) and after (post-cue) retrocue onset. They reported that in the pre-cue delay, the individual stimuli… Show more

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“…Nonetheless, we find distinct temporally stable coding spaces in which sensory distractors and memory targets are encoded. These results correspond to prior research demonstrating a rotated format between perception and memory representations 20 , attended and unattended VWM representations in both humans and recurrent-neural networks trained on a 2-back VWM 22 and serial retro-cueing tasks 23,43 . Additionally, similar rotation dynamics have been observed between multiple spatial VWM locations stored in the non-human primate lPFC 21 .…”
Section: Discussionsupporting
confidence: 90%
“…Nonetheless, we find distinct temporally stable coding spaces in which sensory distractors and memory targets are encoded. These results correspond to prior research demonstrating a rotated format between perception and memory representations 20 , attended and unattended VWM representations in both humans and recurrent-neural networks trained on a 2-back VWM 22 and serial retro-cueing tasks 23,43 . Additionally, similar rotation dynamics have been observed between multiple spatial VWM locations stored in the non-human primate lPFC 21 .…”
Section: Discussionsupporting
confidence: 90%