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Search Results: 1 - 10 of 12618 matches for " Yuejia Luo "
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Attentional negativity bias moderated by positive mood arousal
ChunPing Chen,YueJia Luo
Chinese Science Bulletin , 2010, DOI: 10.1007/s11434-010-3220-6
Abstract: Automatically allocation of more attention to negative stimuli is called emotional negativity bias. An event-related potentials (ERPs) experiment investigated whether or not this bias was altered by positive mood arousal. The results suggested that the attention bias towards negative stimuli was attenuated when positive information was accessible.
Mismatch negativity of ERP in cross-modal attention
Yuejia Luo,Jinghan Wei
Science China Life Sciences , 1997, DOI: 10.1007/BF02882690
Abstract: Event-related potentials were measured in 12 healthy youth subjects aged 19–22 using the paradigm “cross-modal and delayed response” which is able to improve unattended purity and to avoid the effect of task target on the deviant components of ERP. The experiment included two conditions: (i) Attend visual modality, ignore auditory modality; (ii) attend auditory modality, ignore visual modality. The stimuli under the two conditions were the same. The difference wave was obtained by subtracting ERPs of the standard stimuli from that of the deviant stimuli. The present results showed that mismatch negativity (MMN), N2b and P3 components can be produced in the auditory and visual modalities under attention condition. However, only MMN was observed in the two modalities under inattention condition. Auditory and visual MMN have some features in common: their largest MMN wave peaks were distributed respectively over their primary sensory projection areas of the scalp under attention condition, but over frontc-central scalp under inattention condition. There was no significant difference between the amplitudes of visual and auditory MMN. Their amplitudes and the scalp distribution were unaffected by attention, thus suggesting that MMN amplitude is an important index reflecting automatic processing in the brain. However, the latency of the auditory and visual MMN were affected by attention, showing that MMN not only reflects automatic processing but also probably relates to control processing.
Event-related potentials study on cross-modal discrimination of Chinese characters
Yuejia Luo,Jinghan Wei
Science China Life Sciences , 1999, DOI: 10.1007/BF02880045
Abstract: Event-related potentials (ERPs) were measured in 15 normal young subjects (18–22 years old) using the “cross-modal and delayed response” paradigm, which is able to improve inattention purity. The stimuli consisted of written and spoken single Chinese characters. The presentation probability of standard stimuli was 82.5% and that of deviant stimuli was 17.5%. The attention components were obtained by subtracting the ERPs of inattention condition from those of attention condition. The results of the N1 scalp distribution demonstrated a cross-modal difference. This result is in contrast to studies with non-verbal as well as with English verbal stimuli. This probably reflected the brain mechanism feature of Chinese language processing. The processing location of attention was varied along with verbal/ non-verbal stimuli, auditory/visual modalities and standard/deviant stimuli, and thus it has plasticity. The early attention effects occurred before the exogenous components, and thus provided evidence supporting the early selective theory of attention. According to the relationship of N1 and Nd1, the present result supported the viewpoint that the N1 enhancement was caused by endogenous components overlapping with exogenous one rather than by pure exogenous component.
Neural correlates of “feeling-of-not-knowing”: Evidence from functional MRI
Jing Luo,Niki Kazuhisa,Yuejia Luo
Chinese Science Bulletin , 2003, DOI: 10.1360/03tb9029
Abstract: The neural correlates of “feeling-of-notknowing” (“FOnK”, i.e. the feeling-of-knowing judgments that accurately predicted “not knowing” or “misses” in the criterion test) were investigated by the event-related fMRI method through an RJR (recall-judgment-recognition) procedure that adopted unrelated word pairs as materials. Results revealed that, relative to the inaccurate “FOnK” predictions, the accurate ones were associated with activities in right ventral prefrontal cortex (PFC) and insula, the areas that were known to subserve “cue specification” in which the retrieval cues were converted into “descriptors” that could be used for direct memory search. This result implied that the accurate “FOnK” predictions relayed more on “cue specification” process than the inaccurate ones and was in consistent with the cue familiarity heuristic hypothesis of feeling-of-knowing.
THE EARLY ERP EFFECTS REFLECT NEURAL ACTIVITY IN SPATIAL SCALE OF VISUAL ATTENTION
早期ERP效应与视觉注意空间等级的脑调节机制

Luo Yuejia,
罗跃嘉

心理学报 , 2001,
Abstract: To investigate temporal dynamics of the spatial scaling of attention during visual search, event-related potentials (ERPs) were measured in young subjects who performed a search task in which the search array was preceded by valid cues that varied in size and hence in precision of target localization. The effects of cue size on P1 and N1 components, and the time course of these effects with variation in cue-target stimulus onset asynchrony (SOA), were examined. Reaction time (RT) to discriminate a target was prolonged as cue size increased. The amplitudes of the posterior P1 and N1 evoked by the search array were affected in opposite ways by the size of the precue: P1 amplitude increased whereas N1 amplitude decreased as cue size increased, particularly following the shortest SOA. The results showed that when top-down information about the region to be searched was less precise (larger cues), RT slowed and the neural generators of P1 became more active, reflecting the additional computations required in changing the spatial scale of attention to the appropriate element size to facilitate target discrimination. In contrast, the decrease in N1 amplitude with cue size may reflect the broadening of the spatial gradient of attention. The results provided electrophysiological evidence that changes in the spatial scale of attention modulate neural activity in early visual cortical areas and activate at least two temporally-overlapping component processes during visual search.
Early ERP effects on the scaling of spatial attention in visual search

Yanan Niu,Jinghan Wei,Yuejia Luo,

自然科学进展 , 2008,
Abstract:
Individual Differences in Detecting Rapidly Presented Fearful Faces
Dandan Zhang, Lili Wang, Yi Luo, Yuejia Luo
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0049517
Abstract: Rapid detection of evolutionarily relevant threats (e.g., fearful faces) is important for human survival. The ability to rapidly detect fearful faces exhibits high variability across individuals. The present study aimed to investigate the relationship between behavioral detection ability and brain activity, using both event-related potential (ERP) and event-related oscillation (ERO) measurements. Faces with fearful or neutral facial expressions were presented for 17 ms or 200 ms in a backward masking paradigm. Forty-two participants were required to discriminate facial expressions of the masked faces. The behavioral sensitivity index d' showed that the detection ability to rapidly presented and masked fearful faces varied across participants. The ANOVA analyses showed that the facial expression, hemisphere, and presentation duration affected the grand-mean ERP (N1, P1, and N170) and ERO (below 20 Hz and lasted from 100 ms to 250 ms post-stimulus, mainly in theta band) brain activity. More importantly, the overall detection ability of 42 subjects was significantly correlated with the emotion effect (i.e., fearful vs. neutral) on ERP (r = 0.403) and ERO (r = 0.552) measurements. A higher d' value was corresponding to a larger size of the emotional effect (i.e., fearful – neutral) of N170 amplitude and a larger size of the emotional effect of the specific ERO spectral power at the right hemisphere. The present results suggested a close link between behavioral detection ability and the N170 amplitude as well as the ERO spectral power below 20 Hz in individuals. The emotional effect size between fearful and neutral faces in brain activity may reflect the level of conscious awareness of fearful faces.
Neural correlates of “feeling-of-not-knowing”: Evidence from functional MRI
Neural correlates of “feeling-of-not-knowing”:Evidence from functional MRI

Jing Luo,Niki Kazuhisa,Yuejia Luo,
LUOJing
,NikiKazuhisa

科学通报(英文版) , 2003,
Abstract:
Neural Adaptation Provides Evidence for Categorical Differences in Processing of Faces and Chinese Characters: An ERP Study of the N170
Shimin Fu, Chunliang Feng, Shichun Guo, Yuejia Luo, Raja Parasuraman
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0041103
Abstract: Whether face perception involves domain-specific or domain-general processing is an extensively debated issue. Relative to non-face objects and alphabetical scripts, Chinese characters provide a good contrast to faces because of their structural configuration, requirement for high level of visual expertise to literate Chinese people, and unique appearance and identity for each individual stimulus. To examine potential categorical differences in their neural processing, event-related potentials (ERPs) were recorded to blocked face and Chinese character stimuli. Fast adaptation method was applied to better control for the low-level stimulus difference between faces and Chinese characters. Participants were required to respond to the color of the outer frame in which these stimuli were presented, at either a fast (ISI 650 ms) or slow (ISI 1300 ms) rate, and with an orientation that was either the same or alternated between upright and inverted. Faces elicited a larger and later N170 relative to characters, but the N170 was more left-lateralized for characters relative to the faces. Adaptation-by-rate and adaptation-by-orientation effects were observed on the amplitude of N170, and both were more pronounced for faces relative to characters. Inverted stimuli elicited a later N170 relative to upright stimuli, without amplitude change, and this inversion effect was more pronounced for faces relative to characters. Moreover, faces elicited a larger and later P1 and a larger adaptation-by-rate effect on P1 relative to characters. The adaptation-by-orientation effect was illustrated by a larger P1 under the same relative to the alternated orientation condition. Therefore, evidence from the amplitude and the lateralization of N170, the stimulus inversion effect on N170 latency, and the neural adaptation between faces and Chinese characters on P1 and N170 components support the notion that the processing of faces and Chinese characters involve categorically different neural mechanisms.
The time course of visual categorization: Electrophysiological evidence from ERP
Antao Chen,Hong Li,Jiang Qiu,Yuejia Luo
Chinese Science Bulletin , 2006, DOI: 10.1007/s11434-006-1586-2
Abstract: Visual categorization can be derived from interaction between inputting features set (IFS) from outside stimuli and anticipating features set (AFS) from concept, and such interaction can take two forms: match extraction and conflict control. Using ERP recording, we investigated the temporal course of visual categorization. The results indicated that the larger the AFS, the higher the amplitude of the N1 was generated, which demonstrated the effect of the AFS on the attention. When the size of the AFS was larger than or equal to 2, prominent N2 component was elicited, which demonstrated the effect of conflict when the feature of IFS mismatched with the feature of the AFS. The judgment of category was manifested on the LPC component, and this component was also sensitive to conflict control. Based on the results, we proposed that the temporal course of visual categorization was as follows: selective attention, feature perception, feature match/extraction and judgment of category/conflict control. Among those processes, the judgment of category is the core processing; however the former three sub-processes form the base of categorization. The results are in support of the idea that LPC is responsible for high-level categorization process.
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