scholarly journals Brain networks in human conscious visual perception

2021 ◽  
Author(s):  
Sharif I. Kronemer ◽  
Mark Aksen ◽  
Julia Ding ◽  
Jun Hwan Ryu ◽  
Qilong Xin ◽  
...  
Keyword(s):  
Visual Perception ◽  
Large Scale ◽  
Brain Activity ◽  
Event Related Potentials ◽  
Neural Mechanisms ◽  
Neural Systems ◽  
Functional Magnetic Resonance ◽  
Specific Sequence ◽  
Single Mechanism ◽  
Related Potentials

AbstractConsciousness is not explained by a single mechanism, rather it involves multiple specialized neural systems overlapping in space and time. We hypothesize that synergistic, large-scale subcortical and cortical attention and signal processing networks encode conscious experiences. To identify brain activity in conscious perception without overt report, we classified visual stimuli as perceived or not using eye measurements. Report-independent event-related potentials and functional magnetic resonance imaging (fMRI) signals both occurred at early times after stimuli. Direct recordings revealed a novel thalamic awareness potential linked to conscious visual perception based on report. fMRI showed thalamic and cortical detection, arousal, attentional salience, task-positive, and default mode networks were involved independent of overt report. These findings identify a specific sequence of neural mechanisms in human conscious visual perception.One-Sentence SummaryHuman conscious visual perception engages large-scale subcortical and cortical networks even without overt report.

scholarly journals Investigation of Tactile Perception Evoked by Ridged Texture Using ERP and Non-linear Methods

2021 ◽  
Vol 15 ◽  
Author(s):  
Wei Tang ◽  
Meimei Zhang ◽  
Guofang Chen ◽  
Rui Liu ◽  
Yuxing Peng ◽  
...  
Keyword(s):  
Large Scale ◽  
Brain Activity ◽  
Event Related Potentials ◽  
Tactile Perception ◽  
Textured Surface ◽  
Shape Feature ◽  
Flat Shape ◽  
Non Linear ◽  
Quantification Analysis ◽  
Related Potentials

The triangular ridged surface can improve the grip reliability of products, but the sharp edge of triangular ridge induces sharp and uncomfortable feeling. To study the effect of edge shape (sharp, round, and flat shape) of triangular ridges on brain activity during touching, electroencephalograph (EEG) signals during tactile perception were evaluated using event-related potentials (ERP) and non-linear analysis methods. The results showed that the early component of P100 and P200, and the late component of P300 were successfully induced during perceiving the ridged texture. The edge shape features affect the electrical activity of brain during the tactile perceptions. The sharp shape feature evoked fast P100 latency and high P100 amplitude. The flat texture with complex (sharp and flat) shape feature evoked fast P200 latency, high P200 amplitude and RQA parameters. Both of the sharp shape and complex shape feature tended to evoke high peak amplitude of P300. The large-scale structures of recurrence plots (RPs) and recurrence quantification analysis (RQA) parameters can visually and quantitatively characterize the evolution regulation of the dynamic behavior of EEG system along with the tactile process. This study proved that RPs and RQA were protential methods for the feature extraction and state recognition of EEG during tactile perception of textured surface. This research contributes to optimize surface tactile characteristics on products, especially effective surface textures design for good grip.

The influence of bilingualism on working memory event-related potentials

2018 ◽  
Vol 22 (1) ◽  
pp. 191-199 ◽  
Author(s):  
CASSANDRA MORRISON ◽  
FAROOQ KAMAL ◽  
VANESSA TALER
Keyword(s):  
Working Memory ◽  
Reaction Time ◽  
Brain Activity ◽  
Event Related Potentials ◽  
Neural Mechanisms ◽  
Cognitive Resources ◽  
Memory Event ◽  
Related Potentials ◽  
English Speaking ◽  
Cognitively Demanding Tasks

Bilingualism has been found to enhance the ability to store and manipulate information in working memory (WM). However, previous studies of WM function in bilingualism have been limited to behavioural measures, leaving questions unanswered regarding the effects of bilingualism on neural mechanisms employed during WM tasks. We recorded brain activity (event-related potentials; ERPs) while participants (23 English-speaking and 21 English–French bilinguals) performed an n-back WM task. Accuracy and reaction time were similar across groups, but monolinguals exhibited smaller P300 amplitudes relative to bilinguals, suggesting that bilinguals have more cognitive resources available to complete cognitively demanding tasks.

scholarly journals Associations between genetic factors in individualization of visual perception and components of event-related potentials during assessment of emotional visual stimuli (scenes) with distinct second-order features

F1000Research ◽  
2020 ◽  
Vol 9 ◽  
pp. 1010
Author(s):  
Pavel N. Ermakov ◽  
Elena V. Vorobyeva ◽  
Ekaterina M. Kovsh ◽  
Alexander S. Stoletniy ◽  
Magomed M. Dalgatov ◽  
...  
Keyword(s):  
Visual Perception ◽  
Visual Information ◽  
Brain Activity ◽  
Event Related Potentials ◽  
Average Frequency ◽  
Second Order ◽  
Evaluation Task ◽  
Emotional Evaluation ◽  
Related Potentials ◽  
Visual Scenes

Background: The aim of this paper is to investigate the associations between polymorphisms in the BDNF, COMT, and HTR2A genes with peculiarity of visual perception. In particular, how the carriers of different genotypes of Indicated genes emotionally evaluating visual scenes with distinct second-order features (images modulated by contrast) and how corresponding process is reflected in event-related brain activity (ERP). Methods: The study involved students who underwent PCR-based genetic analysis with the release of BDNF, COMT, and HTR2A genotypes. Participants were asked to emotionally assesse the specific stimuli – visual scenes that were generated from contrast modulations. At the same time the EEG were recorded using a 128-electrodes system. The average frequency of responses and ERPs for different emotional evaluations (negative, neutral and positive) were analyzed. Results: The study showed the BDNF Val/Val polymorphism was associated with the increase in the P2 amplitude in the occipital regions compared to the Val/Met genotype regardless of emotional evaluation. The COMT Met/Met genotype polymorphism associated with the increase of N170 negativity in the occipital regions during evaluation task. The HTR2A polymorphism A/A associated with increase in the P1 amplitude when positive or negative assessment were chosen, and decrease of later positive peak when neutral evaluation was chosen. Conclusions: The results suggested that emotional evaluation and recognition of visual scenes with distinct second-order features, as well as various strategies for processing visual information, reflected in amplitude and latency of different ERPs components and associated with the different genotypes of BDNF, COMT, and HTR2A genes. The indicated interconnections can act as genetic basis of individualize the mechanisms of visual perception.

Language Experience and the Organization of Brain Activity to Phonetically Similar Words: ERP Evidence from 14- and 20-Month-Olds

2004 ◽  
Vol 16 (8) ◽  
pp. 1452-1464 ◽  
Author(s):  
Debra L. Mills ◽  
Chantel Prat ◽  
Renate Zangl ◽  
Christine L. Stager ◽  
Helen J. Neville ◽  
...  
Keyword(s):  
Brain Activity ◽  
Vocabulary Development ◽  
Event Related Potentials ◽  
Developmental Changes ◽  
Neural Systems ◽  
Language Experience ◽  
Word Comprehension ◽  
Word Meanings ◽  
Phonetic Detail ◽  
Related Potentials

The ability to discriminate phonetically similar speech sounds is evident quite early in development. However, inexperienced word learners do not always use this information in processing word meanings [Stager & Werker (1997). Nature, 388, 381–382]. The present study used event-related potentials (ERPs) to examine developmental changes from 14 to 20 months in brain activity important in processing phonetic detail in the context of meaningful words. ERPs were compared to three types of words: words whose meanings were known by the child (e.g., “bear”), nonsense words that differed by an initial phoneme (e.g., “gare”), and nonsense words that differed from the known words by more than one phoneme (e.g., “kobe”). These results supported the behavioral findings suggesting that inexperienced word learners do not use information about phonetic detail when processing word meanings. For the 14-month-olds, ERPs to known words (e.g., “bear”) differed from ERPs to phonetically dissimilar nonsense words (e.g., “kobe”), but did not differ from ERPs to phonetically similar nonsense words (e.g., “gare”), suggesting that known words and similar mispronunciations were processed as the same word. In contrast, for experienced word learners (i.e., 20-month-olds), ERPs to known words (e.g., “bear”) differed from those to both types of nonsense words (“gare” and “kobe”). Changes in the lateral distribution of ERP differences to known and unknown (nonce) words between 14 and 20 months replicated previous findings. The findings suggested that vocabulary development is an important factor in the organization of neural systems linked to processing phonetic detail within the context of word comprehension.

Visual perception of different wood surfaces: an event-related potentials study

2021 ◽  
Vol 78 (2) ◽  
Author(s):  
Qian Wan ◽  
Xiaohe Li ◽  
Yachi Zhang ◽  
Shasha Song ◽  
Qing Ke
Keyword(s):  
Visual Perception ◽  
Event Related Potentials ◽  
Related Potentials ◽  
Wood Surfaces

scholarly journals Anytime collaborative brain–computer interfaces for enhancing perceptual group decision-making

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Saugat Bhattacharyya ◽  
Davide Valeriani ◽  
Caterina Cinel ◽  
Luca Citi ◽  
Riccardo Poli
Keyword(s):  
Decision Making ◽  
Group Decision Making ◽  
Group Decision ◽  
Brain Activity ◽  
Event Related Potentials ◽  
Brain Computer Interfaces ◽  
Appearance Time ◽  
Perceptual Group ◽  
Computer Interfaces ◽  
Related Potentials

AbstractIn this paper we present, and test in two realistic environments, collaborative Brain-Computer Interfaces (cBCIs) that can significantly increase both the speed and the accuracy of perceptual group decision-making. The key distinguishing features of this work are: (1) our cBCIs combine behavioural, physiological and neural data in such a way as to be able to provide a group decision at any time after the quickest team member casts their vote, but the quality of a cBCI-assisted decision improves monotonically the longer the group decision can wait; (2) we apply our cBCIs to two realistic scenarios of military relevance (patrolling a dark corridor and manning an outpost at night where users need to identify any unidentified characters that appear) in which decisions are based on information conveyed through video feeds; and (3) our cBCIs exploit Event-Related Potentials (ERPs) elicited in brain activity by the appearance of potential threats but, uniquely, the appearance time is estimated automatically by the system (rather than being unrealistically provided to it). As a result of these elements, in the two test environments, groups assisted by our cBCIs make both more accurate and faster decisions than when individual decisions are integrated in more traditional manners.

Syntactically Based Sentence Processing Classes: Evidence from Event-Related Brain Potentials

1991 ◽  
Vol 3 (2) ◽  
pp. 151-165 ◽  
Author(s):  
Helen Neville ◽  
Janet L. Nicol ◽  
Andrew Barss ◽  
Kenneth I. Forster ◽  
Merrill F. Garrett
Keyword(s):  
Left Hemisphere ◽  
Sentence Processing ◽  
Brain Activity ◽  
Phrase Structure ◽  
Event Related Potentials ◽  
Negative Potential ◽  
Developmental Studies ◽  
Brain Potentials ◽  
Related Potentials ◽  
Theoretical Considerations

Theoretical considerations and diverse empirical data from clinical, psycholinguistic, and developmental studies suggest that language comprehension processes are decomposable into separate subsystems, including distinct systems for semantic and grammatical processing. Here we report that event-related potentials (ERPs) to syntactically well-formed but semantically anomalous sentences produced a pattern of brain activity that is distinct in timing and distribution from the patterns elicited by syntactically deviant sentences, and further, that different types of syntactic deviance produced distinct ERP patterns. Forty right-handed young adults read sentences presented at 2 words/sec while ERPs were recorded from over several positions between and within the hemispheres. Half of the sentences were semantically and grammatically acceptable and were controls for the remainder, which contained sentence medial words that violated (1) semantic expectations, (2) phrase structure rules, or (3) WH-movement constraints on Specificity and (4) Subjacency. As in prior research, the semantic anomalies produced a negative potential, N400, that was bilaterally distributed and was largest over posterior regions. The phrase structure violations enhanced the N125 response over anterior regions of the left hemisphere, and elicited a negative response (300-500 msec) over temporal and parietal regions of the left hemisphere. Violations of Specificity constraints produced a slow negative potential, evident by 125 msec, that was also largest over anterior regions of the left hemisphere. Violations of Subjacency constraints elicited a broadly and symmetrically distributed positivity that onset around 200 msec. The distinct timing and distribution of these effects provide biological support for theories that distinguish between these types of grammatical rules and constraints and more generally for the proposal that semantic and grammatical processes are distinct subsystems within the language faculty.

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