6 results on '"Jiaofeng Li"'
Search Results
2. Evidence for the beneficial effect of perceptual grouping on visual working memory: an empirical study on illusory contour and a meta-analytic study
- Author
-
Jiaofeng Li, Jiehui Qian, and Fan Liang
- Subjects
Illusory Contours ,Visual Working Memory (VWM) ,Perceptual Grouping ,Display Memory ,Grouping Relevant Feature ,Medicine ,Science - Abstract
Abstract The capacity of visual working memory (VWM) is found to be extremely limited. Past research shows that VWM can be facilitated by Gestalt principles of grouping, however, it remains controversial whether factors like the type of Gestalt principles, the characteristics of stimuli and the nature of experimental design could affect the beneficial effect of grouping. In particular, studies have shown that perceptual grouping could improve memory performance for a feature that is relevant for grouping, but it is unclear whether the same improvement exists for a feature that is irrelevant for grouping. In this article, an empirical study and a meta-analytic study were conducted to investigate the effect of perceptual grouping on VWM. In the empirical study, we examined the grouping effect by employing a Kanizsa illusion in which memory items were grouped by illusory contour. We found that the memory performance was improved for the grouped items even though the tested feature was grouping irrelevant, and the improvement was not significantly different from the effect of grouping by physical connectedness or by solid occlusion. In the meta-analytic study, we systematically and quantitatively examined the effect of perceptual grouping on VWM by pulling the results from all eligible studies, and found that the beneficial grouping effect was robust but the magnitude of the effect can be affected by several moderators. Factors like the types of grouping methods, the duration and the layout of the memory display, and the characteristics of the tested feature moderated the grouping effect, whereas whether employing a cue or a verbal suppression task did not. Our study suggests that the underlying mechanism of the grouping benefit may be distinct with regard to grouping relevancy of the to-be-stored feature. The grouping effect on VWM may be independent of attention for a grouping relevant feature, but may rely on attentional prioritization for a grouping irrelevant feature.
- Published
- 2018
- Full Text
- View/download PDF
3. Evidence for the effect of depth on visual working memory
- Author
-
Jiehui Qian, Jiaofeng Li, Kaiyue Wang, Shengxi Liu, and Quan Lei
- Subjects
Medicine ,Science - Abstract
Abstract Visual working memory (VWM) is a cognitive memory buffer for temporarily holding, processing, and manipulating visual information. Previous studies have demonstrated mixed results of the effect of depth perception on VWM, with some showing a beneficial effect while others not. In this study, we employed an adapted change detection paradigm to investigate the effects of two depth cues, binocular disparity and relative size. The memory array consisted of a set of pseudo-randomly positioned colored items, and the task was to judge whether the test item was changed compared to the memory item after a retention interval. We found that presenting the items in stereoscopic depth alone hardly affected VWM performance. When combining the two coherent depth cues, a significant larger VWM capacity of the perceptually closer-in-depth items was observed than that of the farther items, but the capacity for the two-depth-planes condition was not significantly different from that for the one-plane condition. Conflicting the two depth cues resulted in cancelling the beneficial effect of presenting items at a closer depth plane. The results indicate that depth perception could affect VWM, and the visual system may have an advantage in maintaining closer-in-depth objects in working memory.
- Published
- 2017
- Full Text
- View/download PDF
4. Genetically encoded formaldehyde sensors inspired by a protein intra-helical crosslinking reaction
- Author
-
Gong Zhang, Peng Chen, Yulong Li, Yu Han, Miao Jing, Jiaofeng Li, Jingyi Zhao, and Rongfeng Zhu
- Subjects
0301 basic medicine ,Conformational change ,Protein Conformation ,Science ,General Physics and Astronomy ,Biosensing Techniques ,Bacillus subtilis ,010402 general chemistry ,medicine.disease_cause ,01 natural sciences ,General Biochemistry, Genetics and Molecular Biology ,Mice ,03 medical and health sciences ,Protein structure ,Bacterial Proteins ,Formaldehyde ,medicine ,Animals ,Humans ,Cysteine ,Transcription factor ,Sensors and probes ,Carcinogen ,Multidisciplinary ,biology ,Toxin ,Chemistry ,Lysine ,Comment ,Brain ,Reproducibility of Results ,General Chemistry ,biology.organism_classification ,0104 chemical sciences ,Cell biology ,Cross-Linking Reagents ,Mechanisms of disease ,030104 developmental biology ,Helix ,Transcription Factors ,Macromolecule - Abstract
Formaldehyde (FA) has long been considered as a toxin and carcinogen due to its damaging effects to biological macromolecules, but its beneficial roles have been increasingly appreciated lately. Real-time monitoring of this reactive molecule in living systems is highly desired in order to decipher its physiological and/or pathological functions, but a genetically encoded FA sensor is currently lacking. We herein adopt a structure-based study of the underlying mechanism of the FA-responsive transcription factor HxlR from Bacillus subtilis, which shows that HxlR recognizes FA through an intra-helical cysteine-lysine crosslinking reaction at its N-terminal helix α1, leading to conformational change and transcriptional activation. By leveraging this FA-induced intra-helical crosslinking and gain-of-function reorganization, we develop the genetically encoded, reaction-based FA sensor—FAsor, allowing spatial-temporal visualization of FA in mammalian cells and mouse brain tissues.
- Published
- 2021
5. Evidence for the beneficial effect of perceptual grouping on visual working memory: an empirical study on illusory contour and a meta-analytic study
- Author
-
Jiehui Qian, Fan Liang, and Jiaofeng Li
- Subjects
Male ,Perceptual Grouping ,Social connectedness ,media_common.quotation_subject ,Illusory Contours ,Science ,Illusion ,Affect (psychology) ,Article ,050105 experimental psychology ,Young Adult ,03 medical and health sciences ,0302 clinical medicine ,Empirical research ,Perception ,Humans ,0501 psychology and cognitive sciences ,Visual Working Memory (VWM) ,media_common ,Multidisciplinary ,Working memory ,05 social sciences ,Illusions ,Memory, Short-Term ,Display Memory ,Feature (computer vision) ,Grouping Relevant Feature ,Visual Perception ,Gestalt psychology ,Medicine ,Female ,Psychology ,030217 neurology & neurosurgery ,Cognitive psychology - Abstract
The capacity of visual working memory (VWM) is found to be extremely limited. Past research shows that VWM can be facilitated by Gestalt principles of grouping, however, it remains controversial whether factors like the type of Gestalt principles, the characteristics of stimuli and the nature of experimental design could affect the beneficial effect of grouping. In particular, studies have shown that perceptual grouping could improve memory performance for a feature that is relevant for grouping, but it is unclear whether the same improvement exists for a feature that is irrelevant for grouping. In this article, an empirical study and a meta-analytic study were conducted to investigate the effect of perceptual grouping on VWM. In the empirical study, we examined the grouping effect by employing a Kanizsa illusion in which memory items were grouped by illusory contour. We found that the memory performance was improved for the grouped items even though the tested feature was grouping irrelevant, and the improvement was not significantly different from the effect of grouping by physical connectedness or by solid occlusion. In the meta-analytic study, we systematically and quantitatively examined the effect of perceptual grouping on VWM by pulling the results from all eligible studies, and found that the beneficial grouping effect was robust but the magnitude of the effect can be affected by several moderators. Factors like the types of grouping methods, the duration and the layout of the memory display, and the characteristics of the tested feature moderated the grouping effect, whereas whether employing a cue or a verbal suppression task did not. Our study suggests that the underlying mechanism of the grouping benefit may be distinct with regard to grouping relevancy of the to-be-stored feature. The grouping effect on VWM may be independent of attention for a grouping relevant feature, but may rely on attentional prioritization for a grouping irrelevant feature.
- Published
- 2018
6. Evidence for the effect of depth on visual working memory
- Author
-
Jiaofeng Li, Jiehui Qian, Quan Lei, Kaiyue Wang, and Shengxi Liu
- Subjects
Adult ,Memory buffer register ,Visual perception ,Science ,Affect (psychology) ,050105 experimental psychology ,Article ,03 medical and health sciences ,0302 clinical medicine ,Humans ,0501 psychology and cognitive sciences ,Computer vision ,Set (psychology) ,Multidisciplinary ,business.industry ,Working memory ,05 social sciences ,Cognition ,Nontherapeutic Human Experimentation ,Memory, Short-Term ,Visual Perception ,Medicine ,Binocular disparity ,Artificial intelligence ,business ,Depth perception ,Psychology ,030217 neurology & neurosurgery ,Photic Stimulation ,Cognitive psychology - Abstract
Visual working memory (VWM) is a cognitive memory buffer for temporarily holding, processing, and manipulating visual information. Previous studies have demonstrated mixed results of the effect of depth perception on VWM, with some showing a beneficial effect while others not. In this study, we employed an adapted change detection paradigm to investigate the effects of two depth cues, binocular disparity and relative size. The memory array consisted of a set of pseudo-randomly positioned colored items, and the task was to judge whether the test item was changed compared to the memory item after a retention interval. We found that presenting the items in stereoscopic depth alone hardly affected VWM performance. When combining the two coherent depth cues, a significant larger VWM capacity of the perceptually closer-in-depth items was observed than that of the farther items, but the capacity for the two-depth-planes condition was not significantly different from that for the one-plane condition. Conflicting the two depth cues resulted in cancelling the beneficial effect of presenting items at a closer depth plane. The results indicate that depth perception could affect VWM, and the visual system may have an advantage in maintaining closer-in-depth objects in working memory.
- Published
- 2017
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