scholarly journals Late Positivity Does Not Meet the Criteria to be Considered a Proper Neural Correlate of Perceptual Awareness

2020 ◽  
Vol 14 ◽  
Author(s):  
Chiara Mazzi ◽  
Gaetano Mazzeo ◽  
Silvia Savazzi
Keyword(s):  
Perceptual Awareness ◽  
Neural Correlate ◽  
Late Positivity

scholarly journals Three comments on Teller’s “bridge locus”

2013 ◽  
Vol 30 (5-6) ◽  
pp. 219-222 ◽  
Author(s):  
J. ANTHONY MOVSHON
Keyword(s):  
Perceptual Experience ◽  
Brain Activity ◽  
Visual Pathway ◽  
Perceptual Awareness ◽  
Neural Correlate ◽  
Current Thinking ◽  
Close Relationship ◽  
Perceptual Representations ◽  
The Relationship ◽  
Neural Correlate Of Consciousness

AbstractThe notion of a set of neurons that form a “bridge locus” serving as the immediate substrate of visual perception is examined in the light of evidence on the architecture of the visual pathway, of current thinking about perceptual representations, and of the basis of perceptual awareness. The bridge locus is likely to be part of a tangled web of representations, and this complexity raises the question of whether another scheme that relies less on geography might offer a better framework. The bridge locus bears a close relationship to the neural correlate of consciousness (NCC), and like the NCC may be a concept which is no longer precise enough to provide a useful basis for reasoning about the relationship between brain activity and perceptual experience.

scholarly journals The early but not the late neural correlate of auditory awareness is contralateral to auditory stimulation

2020 ◽  
Author(s):  
Rasmus Eklund ◽  
Billy Gerdfeldter ◽  
Stefan Wiens
Keyword(s):  
Critical Role ◽  
Auditory Stimulation ◽  
Neural Correlate ◽  
Somatosensory Stimulation ◽  
Late Positivity ◽  
Processing Theory ◽  
Recurrent Processing ◽  
Phenomenal Awareness ◽  
Early Activity ◽  
Support Research

Theories disagree as to whether it is the early or the late neural correlate of awareness plays a critical role in phenomenal awareness. According to recurrent processing theory, early activity in primary sensory areas should correspond closely to phenomenal awareness. In support, research with electroencephalography found that in the visual and somatosensory modality, an early neural correlate of awareness is contralateral to stimulation, whereas a late neural correlate of awareness does not appear to be lateralized. Thus, early activity is sensitive to the perceived location of visual and somatosensory stimulation. Critically, it is unresolved whether this is true also for hearing. In the present study (N = 26 students), we found that the early neural correlate of awareness (auditory awareness negativity, AAN) was contralateral to auditory stimulation, whereas the late (late positivity, LP) was not. Because these findings match those in the visual and somatosensory modalities, they suggest that recurrent processing theory is valid across modalities.

Visual-Neural Correlate of Speechreading Ability in Normal-Hearing Adults

1982 ◽  
Vol 25 (4) ◽  
pp. 521-527 ◽  
Author(s):  
David C. Shepherd
Keyword(s):  
Normal Hearing ◽  
Wave Form ◽  
Firing Time ◽  
Neural Firing ◽  
Neural Correlate ◽  
Retest Reliability ◽  
Repeated Word ◽  
Negative Peak ◽  
The Stability ◽  
Test Retest Reliability

In 1977, Shepherd and colleagues reported significant correlations (–.90, –.91) between speechreading scores and the latency of a selected negative peak (VN 130 measure) on the averaged visual electroencephalic wave form. The primary purpose of this current study was to examine the stability, or repeatability, of this relation between these cognitive and neurophysiologic measures over a period of several months and thus support its test-retest reliability. Repeated speechreading word and sentence scores were gathered during three test-retest sessions from each of 20 normal-hearing adults. An average of 56 days occurred from the end of one to the beginning of another speechreading sessions. During each of four other test-retest sessions, averaged visual electroencephalic responses (AVER s ) were evoked from each subject. An average of 49 clays intervened between AVER sessions. Product-moment correlations computed among repeated word scores and VN l30 measures ranged from –.61 to –.89. Based on these findings, it was concluded that the VN l30 measure of visual neural firing time is a reliable correlate of speech-reading in normal-hearing adults.

Attention, Adumbration, and a Neglected Mark of the Mental

2017 ◽  
Author(s):  
Mark Textor
Keyword(s):  
Peculiar Feature ◽  
Perceptual Awareness

Brentano never investigated whether the ‘peculiar feature’ of inner perception—that it can never become inner observation—that distinguishes our awareness of the mental from other forms of perceptual awareness could serve as the mark of the mental. However, his students Stumpf and Husserl developed marks of the mental that are inspired by this idea. The chapter clarifies Husserl’s Thesis that mental phenomena have no appearances, argues that it is superior to Brentano’s Thesis, and defends it against objections from Reinach and Husserl himself. Husserl himself threw out the baby with the bathwater when he later rejected Husserl’s Thesis. A precisified form of this idea can still unify our intuitions about the mental.

Perceptual awareness or phenomenal consciousness?A dilemma

2021 ◽  
Vol 36 (2) ◽  
Author(s):  
Christopher F. Masciari ◽  
Peter Carruthers
Keyword(s):  
Phenomenal Consciousness ◽  
Perceptual Awareness

scholarly journals Absence of Face-specific Cortical Activity in the Complete Absence of Awareness: Converging Evidence from Functional Magnetic Resonance Imaging and Event-related Potentials

2012 ◽  
Vol 24 (2) ◽  
pp. 396-415 ◽  
Author(s):  
Valia Rodríguez ◽  
Russell Thompson ◽  
Mark Stokes ◽  
Matthew Brett ◽  
Indira Alvarez ◽  
...  
Keyword(s):  
Face Detection ◽  
Brain Area ◽  
Event Related Potentials ◽  
Backward Masking ◽  
Imaging Data ◽  
Perceptual Awareness ◽  
Related Activity ◽  
Related Potentials ◽  
Frontal Operculum ◽  
Detailed Assessment

In this study, we explored the neural correlates of perceptual awareness during a masked face detection task. To assess awareness more precisely than in previous studies, participants employed a 4-point scale to rate subjective visibility. An event-related fMRI and a high-density ERP study were carried out. Imaging data showed that conscious face detection was linked to activation of fusiform and occipital face areas. Frontal and parietal regions, including the pre-SMA, inferior frontal sulcus, anterior insula/frontal operculum, and intraparietal sulcus, also responded strongly when faces were consciously perceived. In contrast, no brain area showed face-selective activity when participants reported no impression of a face. ERP results showed that conscious face detection was associated with enhanced N170 and also with the presence of a second negativity around 300 msec and a slow positivity around 415 msec. Again, face-related activity was absent when faces were not consciously perceived. We suggest that, under conditions of backward masking, ventral stream and fronto-parietal regions show similar, strong links of face-related activity to conscious perception and stress the importance of a detailed assessment of awareness to examine activity related to unseen stimulus events.

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