Similar EEG Activity Patterns During Experimentally-Induced Auditory Illusions and Veridical Perceptions
Hallucinations and illusions are two instances of perceptual experiences illustrating how perception might diverge from external sensory stimulations and be generated or altered based on internal brain states. The occurrence of these phenomena is not constrained to patient populations. Similar exper...
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| Format: | Article |
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Frontiers Media S.A.
2021-04-01
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| Series: | Frontiers in Neuroscience |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fnins.2021.602437/full |
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| author | Maryam Faramarzi Maryam Faramarzi Florian H. Kasten Florian H. Kasten Gamze Altaş André Aleman Branislava Ćurčić-Blake Christoph S. Herrmann Christoph S. Herrmann Christoph S. Herrmann |
| author_facet | Maryam Faramarzi Maryam Faramarzi Florian H. Kasten Florian H. Kasten Gamze Altaş André Aleman Branislava Ćurčić-Blake Christoph S. Herrmann Christoph S. Herrmann Christoph S. Herrmann |
| author_sort | Maryam Faramarzi |
| collection | DOAJ |
| description | Hallucinations and illusions are two instances of perceptual experiences illustrating how perception might diverge from external sensory stimulations and be generated or altered based on internal brain states. The occurrence of these phenomena is not constrained to patient populations. Similar experiences can be elicited in healthy subjects by means of suitable experimental procedures. Studying the neural mechanisms underlying these experiences not only has the potential to expand our understanding of the brain’s perceptual machinery but also of how it might get impaired. In the current study, we employed an auditory signal detection task to induce auditory illusions by presenting speech snippets at near detection threshold intensity embedded in noise. We investigated the neural correlates of auditory false perceptions by examining the EEG activity preceding the responses in speech absent (false alarm, FA) trials and comparing them to speech present (hit) trials. The results of the comparison of event-related potentials (ERPs) in the activation period vs. baseline revealed the presence of an early negativity (EN) and a late positivity (LP) similar in both hits and FAs, which were absent in misses, correct rejections (CR) and control button presses (BPs). We postulate that the EN and the LP might represent the auditory awareness negativity (AAN) and centro-parietal positivity (CPP) or P300, respectively. The event-related spectral perturbations (ERSPs) exhibited a common power enhancement in low frequencies (<4 Hz) in hits and FAs. The low-frequency power enhancement has been frequently shown to be accompanied with P300 as well as separately being a marker of perceptual awareness, referred to as slow cortical potentials (SCP). Furthermore, the comparison of hits vs. FAs showed a significantly higher LP amplitude and low frequency power in hits compared to FAs. Generally, the observed patterns in the present results resembled some of the major neural correlates associated with perceptual awareness in previous studies. Our findings provide evidence that the neural correlates associated with conscious perception, can be elicited in similar ways in both presence and absence of externally presented sensory stimuli. The present findings did not reveal any pre-stimulus alpha and beta modulations distinguishing conscious vs. unconscious perceptions. |
| first_indexed | 2024-12-14T20:16:25Z |
| format | Article |
| id | doaj.art-df46c7619de04ee9aa80369167c11634 |
| institution | Directory Open Access Journal |
| issn | 1662-453X |
| language | English |
| last_indexed | 2024-12-14T20:16:25Z |
| publishDate | 2021-04-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Neuroscience |
| spelling | doaj.art-df46c7619de04ee9aa80369167c116342022-12-21T22:48:50ZengFrontiers Media S.A.Frontiers in Neuroscience1662-453X2021-04-011510.3389/fnins.2021.602437602437Similar EEG Activity Patterns During Experimentally-Induced Auditory Illusions and Veridical PerceptionsMaryam Faramarzi0Maryam Faramarzi1Florian H. Kasten2Florian H. Kasten3Gamze Altaş4André Aleman5Branislava Ćurčić-Blake6Christoph S. Herrmann7Christoph S. Herrmann8Christoph S. Herrmann9Experimental Psychology Lab, Department of Psychology, European Medical School, Cluster of Excellence “Hearing4All,” Carl von Ossietzky University, Oldenburg, GermanyDepartment of Biomedical Sciences of Cells and Systems, Cognitive Neuroscience Center, University of Groningen, University Medical Center Groningen, Groningen, NetherlandsExperimental Psychology Lab, Department of Psychology, European Medical School, Cluster of Excellence “Hearing4All,” Carl von Ossietzky University, Oldenburg, GermanyNeuroimaging Unit, European Medical School, Carl von Ossietzky University, Oldenburg, GermanyExperimental Psychology Lab, Department of Psychology, European Medical School, Cluster of Excellence “Hearing4All,” Carl von Ossietzky University, Oldenburg, GermanyDepartment of Biomedical Sciences of Cells and Systems, Cognitive Neuroscience Center, University of Groningen, University Medical Center Groningen, Groningen, NetherlandsDepartment of Biomedical Sciences of Cells and Systems, Cognitive Neuroscience Center, University of Groningen, University Medical Center Groningen, Groningen, NetherlandsExperimental Psychology Lab, Department of Psychology, European Medical School, Cluster of Excellence “Hearing4All,” Carl von Ossietzky University, Oldenburg, GermanyNeuroimaging Unit, European Medical School, Carl von Ossietzky University, Oldenburg, GermanyResearch Center Neurosensory Science, Carl von Ossietzky University, Oldenburg, GermanyHallucinations and illusions are two instances of perceptual experiences illustrating how perception might diverge from external sensory stimulations and be generated or altered based on internal brain states. The occurrence of these phenomena is not constrained to patient populations. Similar experiences can be elicited in healthy subjects by means of suitable experimental procedures. Studying the neural mechanisms underlying these experiences not only has the potential to expand our understanding of the brain’s perceptual machinery but also of how it might get impaired. In the current study, we employed an auditory signal detection task to induce auditory illusions by presenting speech snippets at near detection threshold intensity embedded in noise. We investigated the neural correlates of auditory false perceptions by examining the EEG activity preceding the responses in speech absent (false alarm, FA) trials and comparing them to speech present (hit) trials. The results of the comparison of event-related potentials (ERPs) in the activation period vs. baseline revealed the presence of an early negativity (EN) and a late positivity (LP) similar in both hits and FAs, which were absent in misses, correct rejections (CR) and control button presses (BPs). We postulate that the EN and the LP might represent the auditory awareness negativity (AAN) and centro-parietal positivity (CPP) or P300, respectively. The event-related spectral perturbations (ERSPs) exhibited a common power enhancement in low frequencies (<4 Hz) in hits and FAs. The low-frequency power enhancement has been frequently shown to be accompanied with P300 as well as separately being a marker of perceptual awareness, referred to as slow cortical potentials (SCP). Furthermore, the comparison of hits vs. FAs showed a significantly higher LP amplitude and low frequency power in hits compared to FAs. Generally, the observed patterns in the present results resembled some of the major neural correlates associated with perceptual awareness in previous studies. Our findings provide evidence that the neural correlates associated with conscious perception, can be elicited in similar ways in both presence and absence of externally presented sensory stimuli. The present findings did not reveal any pre-stimulus alpha and beta modulations distinguishing conscious vs. unconscious perceptions.https://www.frontiersin.org/articles/10.3389/fnins.2021.602437/fullauditory perceptionauditory illusionsauditory awareness negativityCPPlate positivityP300 |
| spellingShingle | Maryam Faramarzi Maryam Faramarzi Florian H. Kasten Florian H. Kasten Gamze Altaş André Aleman Branislava Ćurčić-Blake Christoph S. Herrmann Christoph S. Herrmann Christoph S. Herrmann Similar EEG Activity Patterns During Experimentally-Induced Auditory Illusions and Veridical Perceptions Frontiers in Neuroscience auditory perception auditory illusions auditory awareness negativity CPP late positivity P300 |
| title | Similar EEG Activity Patterns During Experimentally-Induced Auditory Illusions and Veridical Perceptions |
| title_full | Similar EEG Activity Patterns During Experimentally-Induced Auditory Illusions and Veridical Perceptions |
| title_fullStr | Similar EEG Activity Patterns During Experimentally-Induced Auditory Illusions and Veridical Perceptions |
| title_full_unstemmed | Similar EEG Activity Patterns During Experimentally-Induced Auditory Illusions and Veridical Perceptions |
| title_short | Similar EEG Activity Patterns During Experimentally-Induced Auditory Illusions and Veridical Perceptions |
| title_sort | similar eeg activity patterns during experimentally induced auditory illusions and veridical perceptions |
| topic | auditory perception auditory illusions auditory awareness negativity CPP late positivity P300 |
| url | https://www.frontiersin.org/articles/10.3389/fnins.2021.602437/full |
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