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Yusuf PA, Hubka P, Konerding W, Land R, Tillein J, Kral A. Congenital deafness reduces alpha-gamma cross-frequency coupling in the auditory cortex. Hear Res 2024; 449:109032. [PMID: 38797035 DOI: 10.1016/j.heares.2024.109032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/15/2024] [Revised: 04/30/2024] [Accepted: 05/13/2024] [Indexed: 05/29/2024]
Abstract
Neurons within a neuronal network can be grouped by bottom-up and top-down influences using synchrony in neuronal oscillations. This creates the representation of perceptual objects from sensory features. Oscillatory activity can be differentiated into stimulus-phase-locked (evoked) and non-phase-locked (induced). The former is mainly determined by sensory input, the latter by higher-level (cortical) processing. Effects of auditory deprivation on cortical oscillations have been studied in congenitally deaf cats (CDCs) using cochlear implant (CI) stimulation. CI-induced alpha, beta, and gamma activity were compromised in the auditory cortex of CDCs. Furthermore, top-down information flow between secondary and primary auditory areas in hearing cats, conveyed by induced alpha oscillations, was lost in CDCs. Here we used the matching pursuit algorithm to assess components of such oscillatory activity in local field potentials recorded in primary field A1. Additionally to the loss of induced alpha oscillations, we also found a loss of evoked theta activity in CDCs. The loss of theta and alpha activity in CDCs can be directly related to reduced high-frequency (gamma-band) activity due to cross-frequency coupling. Here we quantified such cross-frequency coupling in adult 1) hearing-experienced, acoustically stimulated cats (aHCs), 2) hearing-experienced cats following acute pharmacological deafening and subsequent CIs, thus in electrically stimulated cats (eHCs), and 3) electrically stimulated CDCs. We found significant cross-frequency coupling in all animal groups in > 70% of auditory-responsive sites. The predominant coupling in aHCs and eHCs was between theta/alpha phase and gamma power. In CDCs such coupling was lost and replaced by alpha oscillations coupling to delta/theta phase. Thus, alpha/theta oscillations synchronize high-frequency gamma activity only in hearing-experienced cats. The absence of induced alpha and theta oscillations contributes to the loss of induced gamma power in CDCs, thereby signifying impaired local network activity.
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Affiliation(s)
- Prasandhya A Yusuf
- Hannover Medical School, Institute of AudioNeuroTechnology and Department of Experimental Otology of the ENT Clinics, Hannover, Germany; Faculty of Medicine University of Indonesia, Department of Medical Physiology and Biophysics / Medical Technology IMERI, Jakarta, Indonesia.
| | - Peter Hubka
- Hannover Medical School, Institute of AudioNeuroTechnology and Department of Experimental Otology of the ENT Clinics, Hannover, Germany
| | - Wiebke Konerding
- Hannover Medical School, Institute of AudioNeuroTechnology and Department of Experimental Otology of the ENT Clinics, Hannover, Germany
| | - Rüdiger Land
- Hannover Medical School, Institute of AudioNeuroTechnology and Department of Experimental Otology of the ENT Clinics, Hannover, Germany
| | - Jochen Tillein
- J.W. Goethe University, Department of Otorhinolaryngology, Frankfurt am Main, Germany
| | - Andrej Kral
- Hannover Medical School, Institute of AudioNeuroTechnology and Department of Experimental Otology of the ENT Clinics, Hannover, Germany; Australian Hearing Hub, School of Medicine and Health Sciences, Macquarie University, Sydney, Australia
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Zhao L, Wang X. Frontal cortex activity during the production of diverse social communication calls in marmoset monkeys. Nat Commun 2023; 14:6634. [PMID: 37857618 PMCID: PMC10587070 DOI: 10.1038/s41467-023-42052-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Accepted: 09/28/2023] [Indexed: 10/21/2023] Open
Abstract
Vocal communication is essential for social behaviors in humans and non-human primates. While the frontal cortex is crucial to human speech production, its role in vocal production in non-human primates has long been questioned. It is unclear whether activities in the frontal cortex represent diverse vocal signals used in non-human primate communication. Here we studied single neuron activities and local field potentials (LFP) in the frontal cortex of male marmoset monkeys while the animal engaged in vocal exchanges with conspecifics in a social environment. We found that both single neuron activities and LFP were modulated by the production of each of the four major call types. Moreover, neural activities showed distinct patterns for different call types and theta-band LFP oscillations showed phase-locking to the phrases of twitter calls, suggesting a neural representation of vocalization features. Our results suggest important functions of the marmoset frontal cortex in supporting the production of diverse vocalizations in communication.
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Affiliation(s)
- Lingyun Zhao
- Laboratory of Auditory Neurophysiology, Department of Biomedical Engineering, The Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA.
- Department of Neurological Surgery, University of California, San Francisco, CA, 94158, USA.
| | - Xiaoqin Wang
- Laboratory of Auditory Neurophysiology, Department of Biomedical Engineering, The Johns Hopkins University School of Medicine, Baltimore, MD, 21205, USA.
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Orczyk JJ, Barczak A, Costa-Faidella J, Kajikawa Y. Cross Laminar Traveling Components of Field Potentials due to Volume Conduction of Non-Traveling Neuronal Activity in Macaque Sensory Cortices. J Neurosci 2021; 41:7578-7590. [PMID: 34321312 PMCID: PMC8425975 DOI: 10.1523/jneurosci.3225-20.2021] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2020] [Revised: 06/25/2021] [Accepted: 06/29/2021] [Indexed: 11/21/2022] Open
Abstract
Field potentials (FPs) reflect neuronal activities in the brain, and often exhibit traveling peaks across recording sites. While traveling FPs are interpreted as propagation of neuronal activity, not all studies directly reveal such propagating patterns of neuronal activation. Neuronal activity is associated with transmembrane currents that form dipoles and produce negative and positive fields. Thereby, FP components reverse polarity between those fields and have minimal amplitudes at the center of dipoles. Although their amplitudes could be smaller, FPs are never flat even around these reversals. What occurs around the reversal has not been addressed explicitly, although those are rationally in the middle of active neurons. We show that sensory FPs around the reversal appeared with peaks traveling across cortical laminae in macaque sensory cortices. Interestingly, analyses of current source density did not depict traveling patterns but lamina-delimited current sinks and sources. We simulated FPs produced by volume conduction of a simplified 2 dipoles' model mimicking sensory cortical laminar current source density components. While FPs generated by single dipoles followed the temporal patterns of the dipole moments without traveling peaks, FPs generated by concurrently active dipole moments appeared with traveling components in the vicinity of dipoles by superimposition of individually non-traveling FPs generated by single dipoles. These results indicate that not all traveling FP are generated by traveling neuronal activity, and that recording positions need to be taken into account to describe FP peak components around active neuronal populations.SIGNIFICANCE STATEMENT Field potentials (FPs) generated by neuronal activity in the brain occur with fields of opposite polarity. Likewise, in the cerebral cortices, they have mirror-imaged waveforms in upper and lower layers. We show that FPs appear like traveling across the cortical layers. Interestingly, the traveling FPs occur without traveling components of current source density, which represents transmembrane currents associated with neuronal activity. These seemingly odd findings are explained using current source density models of multiple dipoles. Concurrently active, non-traveling dipoles produce FPs as mixtures of FPs produced by individual dipoles, and result in traveling FP waveforms as the mixing ratio depends on the distances from those dipoles. The results suggest that not all traveling FP components are associated with propagating neuronal activity.
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Affiliation(s)
- John J Orczyk
- Translational Neuroscience Division, Nathan S. Kline Institute for Psychiatric Research, Orangeburg, New York 10962
| | - Annamaria Barczak
- Translational Neuroscience Division, Nathan S. Kline Institute for Psychiatric Research, Orangeburg, New York 10962
| | - Jordi Costa-Faidella
- Translational Neuroscience Division, Nathan S. Kline Institute for Psychiatric Research, Orangeburg, New York 10962
- Brainlab - Cognitive Neuroscience Research Group, Department of Clinical Psychology and Psychobiology, University of Barcelona, Barcelona, Catalonia 08035, Spain
- Institute of Neurosciences, University of Barcelona, Barcelona, Catalonia 08035, Spain
- Institut de Recerca Sant Joan de Déu, Esplugues de Llobregat, Spain, Barcelona, Catalonia 08950
| | - Yoshinao Kajikawa
- Translational Neuroscience Division, Nathan S. Kline Institute for Psychiatric Research, Orangeburg, New York 10962
- Department of Psychiatry, New York University School of Medicine, New York, New York 10016
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4
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Tsunada J, Cohen Y, Gold JI. Post-decision processing in primate prefrontal cortex influences subsequent choices on an auditory decision-making task. eLife 2019; 8:46770. [PMID: 31169495 PMCID: PMC6570479 DOI: 10.7554/elife.46770] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2019] [Accepted: 06/05/2019] [Indexed: 01/11/2023] Open
Abstract
Perceptual decisions do not occur in isolation but instead reflect ongoing evaluation and adjustment processes that can affect future decisions. However, the neuronal substrates of these across-decision processes are not well understood, particularly for auditory decisions. We measured and manipulated the activity of choice-selective neurons in the ventrolateral prefrontal cortex (vlPFC) while monkeys made decisions about the frequency content of noisy auditory stimuli. As the decision was being formed, vlPFC activity was not modulated strongly by the task. However, after decision commitment, vlPFC population activity encoded the sensory evidence, choice, and outcome of the current trial and predicted subject-specific choice biases on the subsequent trial. Consistent with these patterns of neuronal activity, electrical microstimulation in vlPFC tended to affect the subsequent, but not current, decision. Thus, distributed post-commitment representations of graded decision-related information in prefrontal cortex can play a causal role in evaluating past decisions and biasing subsequent ones.
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Affiliation(s)
- Joji Tsunada
- Department of Otorhinolaryngology, University of Pennsylvania, Philadelphia, United States.,Department of Veterinary Medicine, Faculty of Agriculture, Iwate University, Morioka, Japan
| | - Yale Cohen
- Department of Otorhinolaryngology, University of Pennsylvania, Philadelphia, United States.,Department of Neuroscience, University of Pennsylvania, Philadelphia, United States.,Department of Bioengineering, University of Pennsylvania, Philadelphia, United States
| | - Joshua I Gold
- Department of Neuroscience, University of Pennsylvania, Philadelphia, United States
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5
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Disrupted cholinergic modulation can underlie abnormal gamma rhythms in schizophrenia and auditory hallucination. J Comput Neurosci 2017; 43:173-187. [PMID: 29047010 DOI: 10.1007/s10827-017-0666-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2017] [Revised: 10/07/2017] [Accepted: 10/10/2017] [Indexed: 01/06/2023]
Abstract
The pathophysiology of auditory hallucination, a common symptom of schizophrenia, has yet been understood, but during auditory hallucination, primary auditory cortex (A1) shows paradoxical responses. When auditory stimuli are absent, A1 becomes hyperactive, while A1 responses to auditory stimuli are reduced. Such activation pattern of A1 responses during auditory hallucination is consistent with aberrant gamma rhythms in schizophrenia observed during auditory tasks, raising the possibility that the pathology underlying abnormal gamma rhythms can account for auditory hallucination. Moreover, A1 receives top-down signals in the gamma frequency band from an adjacent association area (Par2), and cholinergic modulation regulates interactions between A1 and Par2. In this study, we utilized a computational model of A1 to ask if disrupted cholinergic modulation could underlie abnormal gamma rhythms in schizophrenia. Furthermore, based on our simulation results, we propose potential pathology by which A1 can directly contribute to auditory hallucination.
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Kikuchi Y, Attaheri A, Wilson B, Rhone AE, Nourski KV, Gander PE, Kovach CK, Kawasaki H, Griffiths TD, Howard MA, Petkov CI. Sequence learning modulates neural responses and oscillatory coupling in human and monkey auditory cortex. PLoS Biol 2017; 15:e2000219. [PMID: 28441393 PMCID: PMC5404755 DOI: 10.1371/journal.pbio.2000219] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2016] [Accepted: 03/20/2017] [Indexed: 02/07/2023] Open
Abstract
Learning complex ordering relationships between sensory events in a sequence is fundamental for animal perception and human communication. While it is known that rhythmic sensory events can entrain brain oscillations at different frequencies, how learning and prior experience with sequencing relationships affect neocortical oscillations and neuronal responses is poorly understood. We used an implicit sequence learning paradigm (an "artificial grammar") in which humans and monkeys were exposed to sequences of nonsense words with regularities in the ordering relationships between the words. We then recorded neural responses directly from the auditory cortex in both species in response to novel legal sequences or ones violating specific ordering relationships. Neural oscillations in both monkeys and humans in response to the nonsense word sequences show strikingly similar hierarchically nested low-frequency phase and high-gamma amplitude coupling, establishing this form of oscillatory coupling-previously associated with speech processing in the human auditory cortex-as an evolutionarily conserved biological process. Moreover, learned ordering relationships modulate the observed form of neural oscillatory coupling in both species, with temporally distinct neural oscillatory effects that appear to coordinate neuronal responses in the monkeys. This study identifies the conserved auditory cortical neural signatures involved in monitoring learned sequencing operations, evident as modulations of transient coupling and neuronal responses to temporally structured sensory input.
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Affiliation(s)
- Yukiko Kikuchi
- Institute of Neuroscience, Newcastle University, Newcastle upon Tyne, United Kingdom
- Centre for Behaviour and Evolution, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Adam Attaheri
- Institute of Neuroscience, Newcastle University, Newcastle upon Tyne, United Kingdom
- Centre for Behaviour and Evolution, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Benjamin Wilson
- Institute of Neuroscience, Newcastle University, Newcastle upon Tyne, United Kingdom
- Centre for Behaviour and Evolution, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Ariane E. Rhone
- Human Brain Research Laboratory, Department of Neurosurgery, The University of Iowa, Iowa City, Iowa, United States of America
| | - Kirill V. Nourski
- Human Brain Research Laboratory, Department of Neurosurgery, The University of Iowa, Iowa City, Iowa, United States of America
| | - Phillip E. Gander
- Human Brain Research Laboratory, Department of Neurosurgery, The University of Iowa, Iowa City, Iowa, United States of America
| | - Christopher K. Kovach
- Human Brain Research Laboratory, Department of Neurosurgery, The University of Iowa, Iowa City, Iowa, United States of America
| | - Hiroto Kawasaki
- Human Brain Research Laboratory, Department of Neurosurgery, The University of Iowa, Iowa City, Iowa, United States of America
| | - Timothy D. Griffiths
- Institute of Neuroscience, Newcastle University, Newcastle upon Tyne, United Kingdom
- Human Brain Research Laboratory, Department of Neurosurgery, The University of Iowa, Iowa City, Iowa, United States of America
- Wellcome Trust Centre for Neuroimaging, University College London, London, United Kingdom
| | - Matthew A. Howard
- Human Brain Research Laboratory, Department of Neurosurgery, The University of Iowa, Iowa City, Iowa, United States of America
| | - Christopher I. Petkov
- Institute of Neuroscience, Newcastle University, Newcastle upon Tyne, United Kingdom
- Centre for Behaviour and Evolution, Newcastle University, Newcastle upon Tyne, United Kingdom
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7
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Jafakesh S, Jahromy FZ, Daliri MR. Decoding of object categories from brain signals using cross frequency coupling methods. Biomed Signal Process Control 2016. [DOI: 10.1016/j.bspc.2016.01.013] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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8
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Functional differences in face processing between the amygdala and ventrolateral prefrontal cortex in monkeys. Neuroscience 2015. [DOI: 10.1016/j.neuroscience.2015.07.047] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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9
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Plakke B, Romanski LM. Auditory connections and functions of prefrontal cortex. Front Neurosci 2014; 8:199. [PMID: 25100931 PMCID: PMC4107948 DOI: 10.3389/fnins.2014.00199] [Citation(s) in RCA: 88] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2014] [Accepted: 06/26/2014] [Indexed: 12/17/2022] Open
Abstract
The functional auditory system extends from the ears to the frontal lobes with successively more complex functions occurring as one ascends the hierarchy of the nervous system. Several areas of the frontal lobe receive afferents from both early and late auditory processing regions within the temporal lobe. Afferents from the early part of the cortical auditory system, the auditory belt cortex, which are presumed to carry information regarding auditory features of sounds, project to only a few prefrontal regions and are most dense in the ventrolateral prefrontal cortex (VLPFC). In contrast, projections from the parabelt and the rostral superior temporal gyrus (STG) most likely convey more complex information and target a larger, widespread region of the prefrontal cortex. Neuronal responses reflect these anatomical projections as some prefrontal neurons exhibit responses to features in acoustic stimuli, while other neurons display task-related responses. For example, recording studies in non-human primates indicate that VLPFC is responsive to complex sounds including vocalizations and that VLPFC neurons in area 12/47 respond to sounds with similar acoustic morphology. In contrast, neuronal responses during auditory working memory involve a wider region of the prefrontal cortex. In humans, the frontal lobe is involved in auditory detection, discrimination, and working memory. Past research suggests that dorsal and ventral subregions of the prefrontal cortex process different types of information with dorsal cortex processing spatial/visual information and ventral cortex processing non-spatial/auditory information. While this is apparent in the non-human primate and in some neuroimaging studies, most research in humans indicates that specific task conditions, stimuli or previous experience may bias the recruitment of specific prefrontal regions, suggesting a more flexible role for the frontal lobe during auditory cognition.
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Affiliation(s)
- Bethany Plakke
- Department of Neurobiology and Anatomy, University of Rochester School of Medicine and Dentistry Rochester, NY, USA
| | - Lizabeth M Romanski
- Department of Neurobiology and Anatomy, University of Rochester School of Medicine and Dentistry Rochester, NY, USA
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10
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Gonzalez-Burgos G, Miyamae T, Pafundo DE, Yoshino H, Rotaru DC, Hoftman G, Datta D, Zhang Y, Hammond M, Sampson AR, Fish KN, Ermentrout GB, Lewis DA. Functional Maturation of GABA Synapses During Postnatal Development of the Monkey Dorsolateral Prefrontal Cortex. Cereb Cortex 2014; 25:4076-93. [PMID: 24904071 DOI: 10.1093/cercor/bhu122] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Development of inhibition onto pyramidal cells may be crucial for the emergence of cortical network activity, including gamma oscillations. In primate dorsolateral prefrontal cortex (DLPFC), inhibitory synaptogenesis starts in utero and inhibitory synapse density reaches adult levels before birth. However, in DLPFC, the expression levels of γ-aminobutyric acid (GABA) synapse-related gene products changes markedly during development until young adult age, suggesting a highly protracted maturation of GABA synapse function. Therefore, we examined the development of GABA synapses by recording GABAAR-mediated inhibitory postsynaptic currents (GABAAR-IPSCs) from pyramidal cells in the DLPFC of neonatal, prepubertal, peripubertal, and adult macaque monkeys. We found that the decay of GABAAR-IPSCs, possibly including those from parvalbumin-positive GABA neurons, shortened by prepubertal age, while their amplitude increased until the peripubertal period. Interestingly, both GABAAR-mediated quantal response size, estimated by miniature GABAAR-IPSCs, and the density of GABAAR synaptic appositions, measured with immunofluorescence microscopy, were stable with age. Simulations in a computational model network with constant GABA synapse density showed that the developmental changes in GABAAR-IPSC properties had a significant impact on oscillatory activity and predicted that, whereas DLPFC circuits can generate gamma frequency oscillations by prepubertal age, mature levels of gamma band power are attained at late stages of development.
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Affiliation(s)
- Guillermo Gonzalez-Burgos
- Translational Neuroscience Program, Department of Psychiatry, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA
| | - Takeaki Miyamae
- Translational Neuroscience Program, Department of Psychiatry, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA
| | - Diego E Pafundo
- Translational Neuroscience Program, Department of Psychiatry, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA Current address: Department of Biological Sciences, Carnegie Mellon University, Pittsburgh, USA
| | - Hiroki Yoshino
- Translational Neuroscience Program, Department of Psychiatry, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA Current address: Department of Psychiatry, Nara Medical University, Japan
| | - Diana C Rotaru
- Translational Neuroscience Program, Department of Psychiatry, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA Current address: Department of Integrative Neurophysiology, Vrije Universiteit, Amsterdam, Netherlands
| | - Gil Hoftman
- Translational Neuroscience Program, Department of Psychiatry, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA
| | - Dibyadeep Datta
- Translational Neuroscience Program, Department of Psychiatry, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA
| | - Yun Zhang
- Department of Statistics, University of Pittsburgh, Pittsburgh, PA, USA
| | - Mahjub Hammond
- Department of Mathematics, University of Pittsburgh, Pittsburgh, PA, USA
| | - Allan R Sampson
- Department of Statistics, University of Pittsburgh, Pittsburgh, PA, USA
| | - Kenneth N Fish
- Translational Neuroscience Program, Department of Psychiatry, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA
| | - G Bard Ermentrout
- Department of Mathematics, University of Pittsburgh, Pittsburgh, PA, USA
| | - David A Lewis
- Translational Neuroscience Program, Department of Psychiatry, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA
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11
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Watrous AJ, Ekstrom AD. The spectro-contextual encoding and retrieval theory of episodic memory. Front Hum Neurosci 2014; 8:75. [PMID: 24600373 PMCID: PMC3927099 DOI: 10.3389/fnhum.2014.00075] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2013] [Accepted: 01/29/2014] [Indexed: 11/13/2022] Open
Abstract
The spectral fingerprint hypothesis, which posits that different frequencies of oscillations underlie different cognitive operations, provides one account for how interactions between brain regions support perceptual and attentive processes (Siegel etal., 2012). Here, we explore and extend this idea to the domain of human episodic memory encoding and retrieval. Incorporating findings from the synaptic to cognitive levels of organization, we argue that spectrally precise cross-frequency coupling and phase-synchronization promote the formation of hippocampal-neocortical cell assemblies that form the basis for episodic memory. We suggest that both cell assembly firing patterns as well as the global pattern of brain oscillatory activity within hippocampal-neocortical networks represents the contents of a particular memory. Drawing upon the ideas of context reinstatement and multiple trace theory, we argue that memory retrieval is driven by internal and/or external factors which recreate these frequency-specific oscillatory patterns which occur during episodic encoding. These ideas are synthesized into a novel model of episodic memory (the spectro-contextual encoding and retrieval theory, or "SCERT") that provides several testable predictions for future research.
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Affiliation(s)
- Andrew J Watrous
- Center for Neuroscience, University of California Davis, CA, USA ; University of Bonn, Bonn Germany
| | - Arne D Ekstrom
- Center for Neuroscience, University of California Davis, CA, USA ; Neuroscience Graduate Group, University of California Davis, CA, USA ; Department of Psychology, University of California Davis, CA, USA
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12
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Lopour BA, Tavassoli A, Fried I, Ringach DL. Coding of information in the phase of local field potentials within human medial temporal lobe. Neuron 2013; 79:594-606. [PMID: 23932002 DOI: 10.1016/j.neuron.2013.06.001] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/03/2013] [Indexed: 11/17/2022]
Abstract
There is increasing evidence that the phase of ongoing oscillations plays a role in neural coding, but its relative importance throughout the brain has yet to be understood. We assessed single-trial phase coding in four temporal lobe and four frontal lobe regions of the human brain using local field potentials (LFPs) recorded during a card-matching task. In the temporal lobe, classification of correct/incorrect matches based on LFP phase was significantly better than classification based on amplitude and comparable to the full LFP signal. Surprisingly, in these regions, the correct/incorrect mean phases became aligned to one another before they diverged and coded for trial outcome. Neural responses in the amygdala were consistent with a mechanism of phase resetting, while parahippocampal gyrus activity was indicative of evoked potentials. These findings highlight the importance of phase coding in human medial temporal lobe and suggest that different brain regions may represent information in diverse ways.
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Affiliation(s)
- Beth A Lopour
- Department of Neurobiology, University of California, Los Angeles, CA 90095, USA.
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13
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Friese U, Köster M, Hassler U, Martens U, Trujillo-Barreto N, Gruber T. Successful memory encoding is associated with increased cross-frequency coupling between frontal theta and posterior gamma oscillations in human scalp-recorded EEG. Neuroimage 2012; 66:642-7. [PMID: 23142278 DOI: 10.1016/j.neuroimage.2012.11.002] [Citation(s) in RCA: 141] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2012] [Accepted: 11/01/2012] [Indexed: 11/19/2022] Open
Abstract
Although previous studies have established that successful memory encoding is associated with increased synchronization of theta-band and gamma-band oscillations, it is unclear if there is a functional relationship between oscillations in these frequency bands. Using scalp-recorded EEG in healthy human participants, we demonstrate that cross-frequency coupling between frontal theta phase and posterior gamma power is enhanced during the encoding of visual stimuli which participants later on remember versus items which participants subsequently forget ("subsequent memory effect," SME). Conventional wavelet analyses and source localizations revealed SMEs in spectral power of theta-, alpha-, and gamma-band. Successful compared to unsuccessful encoding was reflected in increased theta-band activity in right frontal cortex as well as increased gamma-band activity in parietal-occipital regions. Moreover, decreased alpha-band activity in prefrontal and occipital cortex was also related to successful encoding. Overall, these findings support the idea that during the formation of new memories frontal cortex regions interact with cortical representations in posterior areas.
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Affiliation(s)
- Uwe Friese
- University Medical Center Hamburg-Eppendorf, Department of Neurophysiology and Pathophysiology, Hamburg, Germany; Institute of Psychology, University of Osnabrueck, Germany.
| | - Moritz Köster
- Institute of Psychology, University of Osnabrueck, Germany; Institute of Cognitive Science, University of Osnabrueck, Germany
| | - Uwe Hassler
- Institute of Psychology, University of Osnabrueck, Germany
| | - Ulla Martens
- Institute of Psychology, University of Osnabrueck, Germany
| | | | - Thomas Gruber
- Institute of Psychology, University of Osnabrueck, Germany
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