scholarly journals Gate-tunable van der Waals heterostructure for reconfigurable neural network vision sensor

2020 ◽  
Vol 6 (26) ◽  
pp. eaba6173 ◽  
Author(s):  
Chen-Yu Wang ◽  
Shi-Jun Liang ◽  
Shuang Wang ◽  
Pengfei Wang ◽  
Zhu’an Li ◽  
...  
Keyword(s):  
Neural Network ◽  
Visual Information ◽  
Van Der Waals ◽  
Bipolar Cells ◽  
Human Retina ◽  
Vision Sensor ◽  
Image Sensing ◽  
Van Der Waals Heterostructure ◽  
Early Processing ◽  
Processing Of Visual Information

Early processing of visual information takes place in the human retina. Mimicking neurobiological structures and functionalities of the retina provides a promising pathway to achieving vision sensor with highly efficient image processing. Here, we demonstrate a prototype vision sensor that operates via the gate-tunable positive and negative photoresponses of the van der Waals (vdW) vertical heterostructures. The sensor emulates not only the neurobiological functionalities of bipolar cells and photoreceptors but also the unique connectivity between bipolar cells and photoreceptors. By tuning gate voltage for each pixel, we achieve reconfigurable vision sensor for simultaneous image sensing and processing. Furthermore, our prototype vision sensor itself can be trained to classify the input images by updating the gate voltages applied individually to each pixel in the sensor. Our work indicates that vdW vertical heterostructures offer a promising platform for the development of neural network vision sensor.

Dysfunction of Magnocellular/dorsal Processing Stream in Schizophrenia

2019 ◽  
Vol 15 (1) ◽  
pp. 26-36
Author(s):  
Sergio Chieffi
Keyword(s):  
Information Processing ◽  
Visual Processing ◽  
Visual Information ◽  
Visual Information Processing ◽  
Contour Detection ◽  
Backward Masking ◽  
Dorsal Pathway ◽  
Processing Stream ◽  
Early Processing ◽  
Processing Of Visual Information

Background: Patients with schizophrenia show not only cognitive, but also perceptual deficits. Perceptual deficits may affect different sensory modalities. Among these, the impairment of visual information processing is of particular relevance as demonstrated by the high incidence of visual disturbances. In recent years, the study of neurophysiological mechanisms that underlie visuo-perceptual, -spatial and -motor disorders in schizophrenia has increasingly attracted the interest of researchers. Objective: The study aims to review the existent literature on magnocellular/dorsal (occipitoparietal) visual processing stream impairment in schizophrenia. The impairment of relatively early stages of visual information processing was examined using experimental paradigms such as backward masking, contrast sensitivity, contour detection, and perceptual closure. The deficits of late processing stages were detected by examining visuo-spatial and -motor abilities. Results: Neurophysiological and behavioral studies support the existence of deficits in the processing of visual information along the magnocellular/dorsal pathway. These deficits appear to affect both early and late stages of visual information processing. Conclusion: The existence of disturbances in the early processing of visual information along the magnocellular/dorsal pathway is strongly supported by neurophysiological and behavioral observations. Early magnocellular dysfunction may provide a substrate for late dorsal processing impairment as well as higher-level cognition deficits.

Investigating the Multimodal Nature of Human Communication

2009 ◽  
Vol 23 (2) ◽  
pp. 63-76 ◽  
Author(s):  
Silke Paulmann ◽  
Sarah Jessen ◽  
Sonja A. Kotz
Keyword(s):  
Visual Information ◽  
Empirical Studies ◽  
Physical Property ◽  
Event Related Potentials ◽  
Accurate Information ◽  
Human Communication ◽  
Channel Condition ◽  
Prosodic Cues ◽  
Early Processing ◽  
Related Potentials

The multimodal nature of human communication has been well established. Yet few empirical studies have systematically examined the widely held belief that this form of perception is facilitated in comparison to unimodal or bimodal perception. In the current experiment we first explored the processing of unimodally presented facial expressions. Furthermore, auditory (prosodic and/or lexical-semantic) information was presented together with the visual information to investigate the processing of bimodal (facial and prosodic cues) and multimodal (facial, lexic, and prosodic cues) human communication. Participants engaged in an identity identification task, while event-related potentials (ERPs) were being recorded to examine early processing mechanisms as reflected in the P200 and N300 component. While the former component has repeatedly been linked to physical property stimulus processing, the latter has been linked to more evaluative “meaning-related” processing. A direct relationship between P200 and N300 amplitude and the number of information channels present was found. The multimodal-channel condition elicited the smallest amplitude in the P200 and N300 components, followed by an increased amplitude in each component for the bimodal-channel condition. The largest amplitude was observed for the unimodal condition. These data suggest that multimodal information induces clear facilitation in comparison to unimodal or bimodal information. The advantage of multimodal perception as reflected in the P200 and N300 components may thus reflect one of the mechanisms allowing for fast and accurate information processing in human communication.

Misfit layer SnTiS3: An assemble-free van der Waals heterostructure SnS/TiS2 for lithium ion battery anode

2021 ◽  
Vol 494 ◽  
pp. 229712
Author(s):  
Yue-E Huang ◽  
Weilin Lin ◽  
Chenguang Shi ◽  
Li Li ◽  
Kaiqing Fan ◽  
...  
Keyword(s):  
Lithium Ion Battery ◽  
Van Der Waals ◽  
Lithium Ion ◽  
Van Der Waals Heterostructure ◽  
Battery Anode

A first-principles study on the electronic and optical properties of a type-II C2N/g-ZnO van der Waals heterostructure

2021 ◽  
Vol 23 (6) ◽  
pp. 3963-3973
Author(s):  
Jianxun Song ◽  
Hua Zheng ◽  
Minxia Liu ◽  
Geng Zhang ◽  
Dongxiong Ling ◽  
...  
Keyword(s):  
Optical Properties ◽  
Dft Calculations ◽  
First Principles ◽  
Van Der Waals ◽  
Band Alignment ◽  
Type Ii ◽  
Electronic And Optical Properties ◽  
Direct Bandgap ◽  
Van Der Waals Heterostructure ◽  
Vdw Heterostructure

The structural, electronic and optical properties of a new vdW heterostructure, C2N/g-ZnO, with an intrinsic type-II band alignment and a direct bandgap of 0.89 eV at the Γ point are extensively studied by DFT calculations.

Realizing efficient CO2 photoreduction in Bi3O4Cl: Constructing van der Waals heterostructure with g-C3N4

2021 ◽  
Vol 409 ◽  
pp. 128178
Author(s):  
Yixue Xu ◽  
Xiaoli Jin ◽  
Teng Ge ◽  
Haiquan Xie ◽  
Ruixue Sun ◽  
...  
Keyword(s):  
Van Der Waals ◽  
Co2 Photoreduction ◽  
Van Der Waals Heterostructure

Significantly Raised Visible‐Light Photocatalytic H 2 Evolution on a 2D/2D ReS 2 /In 2 ZnS 4 van der Waals Heterostructure

Small ◽  
2021 ◽  
pp. 2100296
Author(s):  
Jingrun Ran ◽  
Hongping Zhang ◽  
Jiangtao Qu ◽  
Jieqiong Shan ◽  
Kenneth Davey ◽  
...  
Keyword(s):  
Visible Light ◽  
Van Der Waals ◽  
Van Der Waals Heterostructure ◽  
Visible Light Photocatalytic
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