Time：2020-08-31
Below is an overview of our research.
Yu, Q., Postle, B. (2021) The neural codes underlying internally generated representations in visual working memory. Journal of Cognitive Neuroscience.
Humans can construct rich subjective experience even when no information is available in the external world. Here we investigated the neural representation of purely internally generated stimulus-like information during visual working memory. Using both model-based and model-free approaches, we revealed differential representations for information derived from different sources (external vs. internal), in both early visual cortex and intra parietal sulcus. These results suggested a potential mechanism for how externally-driven and internally-generated information is maintained in working memory.
Yu, Q.*, Panichello, M., Cai, Y., Postle, B., Buschman, T. (2020) Delay-period activity in frontal, parietal, and occipital cortex tracks noise and biases in visual working memory. PLOS Biology.
Using a discrete attractor model and fMRI, we were able to quantify the influence of noise and biases in memory and to reveal their underlying neural substrates: random diffusive memory errors were found to be located in frontal and parietal cortex; while systematic drift of memory was found to be located in lateral occipital cortex. These results provide new insights into the roles of occipital, parietal, and frontal cortex in visual working memory.
Keywords: visual working memory, memory imprecision, frontal cortex, parietal cortex, occipital cortex, attractor modeling
Yu, Q.*#, Teng, C.#, Postle, B.* (2020) Different states of priority recruit different neural representations in visual working memory. PLOS Biology.
We tracked neural codes for information with varied priority states in visual working memory. Using fMRI and inverted encoding models, we discovered a rotational remapping mechanism in working memory that enables simultaneous maintenance of multiple items with different levels of priority.
Keywords: visual working memory, attentional priority, inverted encoding model, priority-based rotational remapping, parietal cortex, visual cortex
Liu, S.*#, Yu, Q.#, Tse, P., Cavanagh, P. (2019) Neural correlates of the conscious perception of visual location lie outside visual cortex. Current Biology.
Using fMRI and MVPA, we decoded the perceived position of a moving stimulus with large perceptual displacement. We found that consciously perceived locations were not realized in the striate and extrastriate cortical areas traditionally associated with visual location processing but were instead represented in higher-order brain areas.
Keywords: motion-induced position shifts, conscious perception, frontal cortex, MVPA, visual cortex
Yu, Q.*, Shim, WM.* (2019) Temporal-order-based attentional priority modulates mnemonic representations in parietal and frontal cortices. Cerebral Cortex.
Using fMRI and an inverted encoding model, we investigated the nature of stimulus-specific representations in parietal and frontal cortex during working memory maintenance. We found that mnemonic representations in parietal and frontal cortices are modulated by temporal-order-based attentional priority signals.
Keywords: attentional priority, early visual cortex, parietal cortex, frontal cortex, temporal order, visual working memory
Gosseries, O.#, Yu, Q.#, LaRocque, J., Starrett, M., Rose, N., Cowan, N., Postle, B.* (2018) Parietal-occipital interactions underlying control- and representation-related processes in working memory for nonspatial visual features. The Journal of Neuroscience.
At least two theoretically distinct factors are proposed to influence visual working memory capacity limitations: an amodal attentional resource that must be shared across remembered items; and the demands on context binding. We provide evidence for the dissociability, and the neural bases, of these two theorized factors, and they specify that the functions of intraparietal sulcus may relate more strongly to the control of representations than to the general allocation of attention.
Keywords: attentional control, information storage, memory load, occipital cortex, parietal cortex, visual working memory
Yu, Q.*, Shim, WM.* (2017) Occipital, parietal, and frontal cortices selectively maintain task-relevant features of multi-feature objects in visual working memory. NeuroImage.
We tracked neural representations of multi-feature objects in occipital, parietal and frontal cortices during working memory maintenance, using fMRI and an inverted encoding model. The results suggest that visual working memory is highly selective and maintains task-relevant features only.
Keywords: visual working memory, task relevance, inverted encoding model, visual cortex, parietal cortex, frontal cortex
Yu, Q., Shim, WM.* (2016) Modulating foveal representation can influence visual discrimination in the periphery. Journal of Vision.
We tested participants’ peripheral visual discrimination performance under direct manipulation of physical stimuli at the fovea. The results provided additional behavioral evidence of the findings by Williams et al. (2008) that foveal feedback information modulates peripheral visual perception.
Keywords: feedback connection, foveal cortex, visual periphery
Postle, B.*, Yu, Q. (2020) Neuroimaging and the localization of function in visual cognition. Visual Cognition.
Keywords: parietal cortex, frontal cortex, representational functions
Yu, Q.*, Postle, B.* (2018) Separating the present and the future. eLife.
Cai, Y., Fulvio, J., Yu, Q., Sheldon, A., Postle, B. (2020) The role of location-context binding in nonspatial visual working memory. eNeuro.Keywords: working memory, task relevance
Keywords: visual working memory, context binding, fMRI
Cai, Y.., Sheldon, A., Yu, Q., Postle, B.* (2019) Overlapping and distinct contributions of stimulus location and of spatial context to nonspatial visual short-term memory. Journal of Neurophysiology.
Keywords: inverted encoding model, location context, visual short-term memory
Chen, J., Yu, Q., Zhu Z., Peng Y., Fang, F.* (2016) Spatial summation revealed in the earliest visual evoked component C1 and the effect of attention on its linearity. Journal of Neurophysiology.
Keywords: attention, spatial summation, linearity, multiple objects, ERPs, C1, V1, P1, N150, BESA source analysis
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