Robust Single Trial Identification of Conscious Percepts Triggered by Sensory Events of Variable Saliency

Teixeira, Marta; Pires, Gabriel; Raimundo, Miguel; Nascimento, Sérgio M. C.; Almeida, Vasco

doi:10.1371/journal.pone.0086201

Cited by 10 publications

(4 citation statements)

References 49 publications

(83 reference statements)

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“…Thus, overt decision making was sped up when the novel stimulus was above participants' thresholds and was delayed when the stimulus was below threshold. This is in line with previous evidence showing how stimulus saliency and uncertainty facilitate and hamper behavioral responses, correspondingly (Garcia et al, 2017;Kayser et al, 2005;Perugini et al, 2016;Teixeira et al, 2014).…”

Section: Behavioral and Electrophysiological Validation Of The Experi...supporting

confidence: 92%

“…Other studies have previously found that the pupil is sensitive to contrast-based stimulus saliency, and that a more pronounced pupil response is associated to increased contrast between standard and deviant stimuli (Liao et al, 2016B; Wang et al, 2014). Similar modulatory effects of contrast-based saliency have been found for the MMN (Näätänen et al, 2007) and the P3 (Teixeira et al, 2010; Texeira et al, 2014). If contrast-based saliency was driving pupil responses, we should have seen a negative correlation between pupil response and MMN across conditions, and a positive correlation between pupil response and P3 for suprathreshold deviants.…”

Section: Discussionsupporting

confidence: 75%

“…Novelty detection can simultaneously engage multiple bottom-up and top-down mechanisms that mediate autonomic and goal-directed responses which are crucial for survival (Anderson et al, 2012; Escera & Malmierca, 2014; Itti & Baldi, 2005; Ranganath & Rainer, 2003; Tiitinen et al, 1994). How the brain weighs such interplay between perception and cognition is in part determined by stimulus properties and brain states (Alamia et al, 2019; Näätänen et al, 2007; Polich, 1987; Teixeira et al, 2014). However, how conscious access (i.e., the availability of a reportable sensory experience for reasoning and rational decision making, Mashour et al, 2020; Naccache, 2018) modulates the neural responses triggered by the detection of sensory novelty is less understood.…”

Section: Introductionmentioning

confidence: 99%

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Neural responses to sensory novelty with and without conscious access

Osorio

Irani

Herrada

et al. 2020

Preprint

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The ability to detect novelty in sensory stimuli is at the base of autonomic and goal-directed behavior. Pupil size, a proxy of the Locus Coeruleus-Norepinephrine system, is sensitive to auditory novelty. However, whether this response reliably reflects conscious processing of novelty remains contentious. Here, we characterized pupil and electrophysiological responses during conscious and subconscious processing of auditory novelty by presenting participants deviant stimuli that were below and above their discriminatory thresholds. We found higher pupil responses to subthreshold targets that were not consciously perceived as deviant stimuli. Larger pupil size and dilation rates were associated to more negative Event-Related Potential values extracted from temporal, prefrontal and anterior cingulate regions. We suggest that increased phasic responses to deviant targets that escape conscious perception reflect Norepinephrine-mediated adaptation of arousal levels in order to meet the perceptual and behavioral demands imposed by the task at hand.

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Section: Behavioral and Electrophysiological Validation Of The Experi...supporting

confidence: 92%

Section: Discussionsupporting

confidence: 75%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Neural responses to sensory novelty with and without conscious access

Osorio

Irani

Herrada

et al. 2020

Preprint

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“…All participants were able to detect the 10 target events of each block in more than 99% of the cases. We had already shown that no detections imply the absence of a P300 matching the absence of behavioural report [ 60 ]. Therefore, the potential confound of no detection of target events is not present in our experiment.…”

Section: Resultsmentioning

confidence: 79%

Neural Signals Evoked by Stimuli of Increasing Social Scene Complexity Are Detectable at the Single-Trial Level and Right Lateralized

Amaral

Simões

2015

PLoS ONE

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Classification of neural signals at the single-trial level and the study of their relevance in affective and cognitive neuroscience are still in their infancy. Here we investigated the neurophysiological correlates of conditions of increasing social scene complexity using 3D human models as targets of attention, which may also be important in autism research. Challenging single-trial statistical classification of EEG neural signals was attempted for detection of oddball stimuli with increasing social scene complexity. Stimuli had an oddball structure and were as follows: 1) flashed schematic eyes, 2) simple 3D faces flashed between averted and non-averted gaze (only eye position changing), 3) simple 3D faces flashed between averted and non-averted gaze (head and eye position changing), 4) animated avatar alternated its gaze direction to the left and to the right (head and eye position), 5) environment with 4 animated avatars all of which change gaze and one of which is the target of attention. We found a late (> 300 ms) neurophysiological oddball correlate for all conditions irrespective of their complexity as assessed by repeated measures ANOVA. We attempted single-trial detection of this signal with automatic classifiers and obtained a significant balanced accuracy classification of around 79%, which is noteworthy given the amount of scene complexity. Lateralization analysis showed a specific right lateralization only for more complex realistic social scenes. In sum, complex ecological animations with social content elicit neurophysiological events which can be characterized even at the single-trial level. These signals are right lateralized. These finding paves the way for neuroscientific studies in affective neuroscience based on complex social scenes, and given the detectability at the single trial level this suggests the feasibility of brain computer interfaces that can be applied to social cognition disorders such as autism.

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Objective measurement of visual resolution using the P300 to self-facial images

Marhöfer¹,

Bach²,

Heinrich³

2015

Doc Ophthalmol

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The study demonstrates the feasibility of a face-based P300 approach to objectively assess visual acuity. The sensitivity to stimulus degradation was comparable to that of a grating-based approach as previously reported. An unexpected finding was the differing behavior of the P300 and the VPP. The VPP was quite sensitive to high-pass filtering, while the P300 sustained stronger filtering, although for its generation, the faces must also be discriminated from scrambled faces.

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Robust Single Trial Identification of Conscious Percepts Triggered by Sensory Events of Variable Saliency

Cited by 10 publications

References 49 publications

Neural responses to sensory novelty with and without conscious access

Neural responses to sensory novelty with and without conscious access

Neural Signals Evoked by Stimuli of Increasing Social Scene Complexity Are Detectable at the Single-Trial Level and Right Lateralized

Objective measurement of visual resolution using the P300 to self-facial images

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