Shifts of Gamma Phase across Primary Visual Cortical Sites Reflect Dynamic Stimulus-Modulated Information Transfer
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{"title"=>"Shifts of Gamma Phase across Primary Visual Cortical Sites Reflect Dynamic Stimulus-Modulated Information Transfer", "type"=>"journal", "authors"=>[{"first_name"=>"Michel", "last_name"=>"Besserve", "scopus_author_id"=>"13805139300"}, {"first_name"=>"Scott C.", "last_name"=>"Lowe", "scopus_author_id"=>"56516260600"}, {"first_name"=>"Nikos K.", "last_name"=>"Logothetis", "scopus_author_id"=>"7005201388"}, {"first_name"=>"Bernhard", "last_name"=>"Schölkopf", "scopus_author_id"=>"7004460308"}, {"first_name"=>"Stefano", "last_name"=>"Panzeri", "scopus_author_id"=>"56260554000"}], "year"=>2015, "source"=>"PLoS Biology", "identifiers"=>{"doi"=>"10.1371/journal.pbio.1002257", "sgr"=>"84943193917", "issn"=>"15457885", "pui"=>"606211060", "isbn"=>"1545-7885 (Electronic)\\r1544-9173 (Linking)", "pmid"=>"26394205", "scopus"=>"2-s2.0-84943193917"}, "id"=>"9f73b3eb-d91c-3efd-b9a0-816a6af666db", "abstract"=>"Distributed neural processing likely entails the capability of networks to reconfigure dynamically the directionality and strength of their functional connections. Yet, the neural mechanisms that may allow such dynamic routing of the information flow are not yet fully understood. We investigated the role of gamma band (50-80 Hz) oscillations in transient modulations of communication among neural populations by using measures of direction-specific causal information transfer. We found that the local phase of gamma-band rhythmic activity exerted a stimulus-modulated and spatially-asymmetric directed effect on the firing rate of spatially separated populations within the primary visual cortex. The relationships between gamma phases at different sites (phase shifts) could be described as a stimulus-modulated gamma-band wave propagating along the spatial directions with the largest information transfer. We observed transient stimulus-related changes in the spatial configuration of phases (compatible with changes in direction of gamma wave propagation) accompanied by a relative increase of the amount of information flowing along the instantaneous direction of the gamma wave. These effects were specific to the gamma-band and suggest that the time-varying relationships between gamma phases at different locations mark, and possibly causally mediate, the dynamic reconfiguration of functional connections.", "link"=>"http://www.mendeley.com/research/shifts-gamma-phase-across-primary-visual-cortical-sites-reflect-dynamic-stimulusmodulated-informatio", "reader_count"=>71, "reader_count_by_academic_status"=>{"Unspecified"=>3, "Professor > Associate Professor"=>3, "Student > Doctoral Student"=>2, "Researcher"=>23, "Student > Ph. D. Student"=>20, "Student > Postgraduate"=>3, "Student > Master"=>11, "Other"=>2, "Lecturer"=>1, "Professor"=>3}, "reader_count_by_user_role"=>{"Unspecified"=>3, "Professor > Associate Professor"=>3, "Student > Doctoral Student"=>2, "Researcher"=>23, "Student > Ph. D. Student"=>20, "Student > Postgraduate"=>3, "Student > Master"=>11, "Other"=>2, "Lecturer"=>1, "Professor"=>3}, "reader_count_by_subject_area"=>{"Unspecified"=>6, "Engineering"=>3, "Environmental Science"=>1, "Agricultural and Biological Sciences"=>20, "Medicine and Dentistry"=>2, "Neuroscience"=>18, "Philosophy"=>1, "Physics and Astronomy"=>5, "Psychology"=>9, "Computer Science"=>5, "Mathematics"=>1}, "reader_count_by_subdiscipline"=>{"Engineering"=>{"Engineering"=>3}, "Medicine and Dentistry"=>{"Medicine and Dentistry"=>2}, "Neuroscience"=>{"Neuroscience"=>18}, "Physics and Astronomy"=>{"Physics and Astronomy"=>5}, "Psychology"=>{"Psychology"=>9}, "Agricultural and Biological Sciences"=>{"Agricultural and Biological Sciences"=>20}, "Computer Science"=>{"Computer Science"=>5}, "Mathematics"=>{"Mathematics"=>1}, "Unspecified"=>{"Unspecified"=>6}, "Environmental Science"=>{"Environmental Science"=>1}, "Philosophy"=>{"Philosophy"=>1}}, "reader_count_by_country"=>{"Netherlands"=>1, "United States"=>5, "Brazil"=>1, "Italy"=>1, "Belarus"=>1, "France"=>1, "Germany"=>3, "Spain"=>1}, "group_count"=>5}

Scopus | Further Information

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Figshare

  • {"files"=>["https://ndownloader.figshare.com/files/2284385"], "description"=>"<p>(A) Scheme of the electrode configuration for the recording of LFPs and MUA in the V1 of anesthetized macaques, we study relationships between signals from distinct recording sites. (B) Spatial coherence of the LFPs averaged across experiments for each of the four recording sessions (d04nm1, d04nm2, c98nm1, g97nm1). Grey lines show spatial coherence computed during spontaneous activity (i.e., the screen used for visual stimulation was blank). Blue lines show spatial coherence during the response to visual stimulation with Hollywood movies. Shaded areas indicate the standard deviation (SD) across experiments. Coherence values were estimated using the multitaper approach applied on nonoverlapping 1 s duration blocks. (C) T-statistics of the comparison of LFP spatial coherence during movie stimulation with respect to spontaneous activity for different frequency bands and recording sessions. Stars indicate significantly positive values (<i>t</i> test, <i>p</i> < .001, Bonferroni corrected). Data available at <a href=\"http://dx.doi.org/10.6084/m9.figshare.1460872\" target=\"_blank\">http://dx.doi.org/10.6084/m9.figshare.1460872</a>.</p>", "links"=>[], "tags"=>["gamma wave propagation", "information transfer", "relationship", "gamma phases"], "article_id"=>1552992, "categories"=>["Uncategorised"], "users"=>["Michel Besserve", "Scott C. Lowe", "Nikos K. Logothetis", "Bernhard Schölkopf", "Stefano Panzeri"], "doi"=>"https://dx.doi.org/10.1371/journal.pbio.1002257.g001", "stats"=>{"downloads"=>0, "page_views"=>16, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Extracellular_multisite_recordings_in_V1_during_movie_stimulation_and_spontaneous_activity_/1552992", "title"=>"Extracellular multisite recordings in V1 during movie stimulation and spontaneous activity.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2015-09-22 04:35:12"}
  • {"files"=>["https://ndownloader.figshare.com/files/2284394", "https://ndownloader.figshare.com/files/2284395", "https://ndownloader.figshare.com/files/2284396", "https://ndownloader.figshare.com/files/2284397", "https://ndownloader.figshare.com/files/2284398", "https://ndownloader.figshare.com/files/2284399", "https://ndownloader.figshare.com/files/2284400", "https://ndownloader.figshare.com/files/2284401", "https://ndownloader.figshare.com/files/2284402", "https://ndownloader.figshare.com/files/2284403"], "description"=>"<div><p>Distributed neural processing likely entails the capability of networks to reconfigure dynamically the directionality and strength of their functional connections. Yet, the neural mechanisms that may allow such dynamic routing of the information flow are not yet fully understood. We investigated the role of gamma band (50–80 Hz) oscillations in transient modulations of communication among neural populations by using measures of direction-specific causal information transfer. We found that the local phase of gamma-band rhythmic activity exerted a stimulus-modulated and spatially-asymmetric directed effect on the firing rate of spatially separated populations within the primary visual cortex. The relationships between gamma phases at different sites (phase shifts) could be described as a stimulus-modulated gamma-band wave propagating along the spatial directions with the largest information transfer. We observed transient stimulus-related changes in the spatial configuration of phases (compatible with changes in direction of gamma wave propagation) accompanied by a relative increase of the amount of information flowing along the instantaneous direction of the gamma wave. These effects were specific to the gamma-band and suggest that the time-varying relationships between gamma phases at different locations mark, and possibly causally mediate, the dynamic reconfiguration of functional connections.</p></div>", "links"=>[], "tags"=>["gamma wave propagation", "information transfer", "relationship", "gamma phases"], "article_id"=>1553001, "categories"=>["Uncategorised"], "users"=>["Michel Besserve", "Scott C. Lowe", "Nikos K. Logothetis", "Bernhard Schölkopf", "Stefano Panzeri"], "doi"=>["https://dx.doi.org/10.1371/journal.pbio.1002257.s001", "https://dx.doi.org/10.1371/journal.pbio.1002257.s002", "https://dx.doi.org/10.1371/journal.pbio.1002257.s003", "https://dx.doi.org/10.1371/journal.pbio.1002257.s004", "https://dx.doi.org/10.1371/journal.pbio.1002257.s005", "https://dx.doi.org/10.1371/journal.pbio.1002257.s006", "https://dx.doi.org/10.1371/journal.pbio.1002257.s007", "https://dx.doi.org/10.1371/journal.pbio.1002257.s008", "https://dx.doi.org/10.1371/journal.pbio.1002257.s009", "https://dx.doi.org/10.1371/journal.pbio.1002257.s010"], "stats"=>{"downloads"=>0, "page_views"=>7, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Shifts_of_Gamma_Phase_across_Primary_Visual_Cortical_Sites_Reflect_Dynamic_Stimulus_Modulated_Information_Transfer_/1553001", "title"=>"Shifts of Gamma Phase across Primary Visual Cortical Sites Reflect Dynamic Stimulus-Modulated Information Transfer", "pos_in_sequence"=>0, "defined_type"=>4, "published_date"=>"2015-09-22 04:35:12"}
  • {"files"=>["https://ndownloader.figshare.com/files/2284392"], "description"=>"<p>(A) Principle of the segmentation of the movie stimulation blocks illustrated on a pair of electrodes (the same one used in <a href=\"http://www.plosbiology.org/article/info:doi/10.1371/journal.pbio.1002257#pbio.1002257.g004\" target=\"_blank\">Fig 4A</a>). For a given sending–receiving electrodes pair, the sign of the phase difference (whose meaning and color coding is illustrated in the schematic representation at the bottom of the panel) is first computed as a function of time for all trials. The histogram of phase differences across trials for this pair is represented on the right-hand side. Periods with a consistent dominant phase difference during a period superior to 300 ms are labelled according to the sign of the gamma phase difference. (B) TE values (Z-score units), from gamma phase to MUA, computed within blocks of positive and negative phase shifts, respectively. Results are presented as average over all relevant pairs across all sessions. Left: TE along the leading direction of causation (over the whole movie) for strongly asymmetric pairs. Middle: TE along the weakest direction of causation (over the whole movie) for strongly asymmetric pairs. Right: TE for symmetric electrode pairs. In this latter case, the average of TE over the two symmetric directions is shown. Stars indicate statistical differences (sign test). Data available at <a href=\"http://dx.doi.org/10.6084/m9.figshare.1460872\" target=\"_blank\">http://dx.doi.org/10.6084/m9.figshare.1460872</a>.</p>", "links"=>[], "tags"=>["gamma wave propagation", "information transfer", "relationship", "gamma phases"], "article_id"=>1552999, "categories"=>["Uncategorised"], "users"=>["Michel Besserve", "Scott C. Lowe", "Nikos K. Logothetis", "Bernhard Schölkopf", "Stefano Panzeri"], "doi"=>"https://dx.doi.org/10.1371/journal.pbio.1002257.g005", "stats"=>{"downloads"=>2, "page_views"=>18, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Changes_in_phase_shift_sign_modulate_dynamically_directional_information_transfer_/1552999", "title"=>"Changes in phase shift sign modulate dynamically directional information transfer.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2015-09-22 04:35:12"}
  • {"files"=>["https://ndownloader.figshare.com/files/2284393"], "description"=>"<p>(A) Principle of the computation of correlation between gamma phase shift of a strongly asymmetric channel pair and movie features (the local TC in this cartoon) measured in the RFs of each electrode in the pair. We extract the contrast time course from the movie data for each RF, symbolically represented over a movie frame, and check whether it is related to gamma phase shift time series for the corresponding electrode pair, by computing correlation across time between the two quantities. The same procedure is applied to the sum and the difference between features from the two RFs. (B) Example of optic flow estimation on one movie frame. Optic flow is estimated on a homogenous grid spreading over the frame. Nonvanishing optic flow estimates are indicated by a red arrow, and vanishing ones are indicated by a black dot. The schematic representation of the movie frame shows a sketch of the sky (light blue on top), the sea (dark blue at the bottom), an island (light green, center and right-hand side), and a remote landscape in the background (dark green, left-hand side). As the camera goes forward towards the island, the optic flow estimation correctly detects a movement of the landscapes towards the sides of the frame. (C) Principle of the computation of the correlation between gamma phase shift of an electrode pair and the directed motion along the inter-RF axis of this pair, derived from the optic flow vector <math><mrow><msub><mi>F</mi><mo>→</mo><mn>1</mn></msub></mrow></math> estimated in the sending recording site. The “+” superscript denotes the positive part. (D) Correlation across time between movie features (either a feature in an individual RF, sending or receiving, or the sum or difference of these features) and gamma phase shifts, averaged across asymmetric channel pairs. Local TC, OA, and directed motion are considered here as movie features. Stars indicate significant correlation values (signed rank test; <i>p</i> < .05). (E) Correlation across time between MUA activity and different movie features (TC or OA) in the RF, averaged across all electrodes. Stars indicate significant correlation values according to a signed rank test (<i>p</i> < .05). (F) Correlation across time of different variables derived from MUA activities of a channel pair (either a feature in an individual RF, or the sum of MUA in the sending and receiving RFs, or difference between MUA in the receiving and MUA in the sending RF) and the gamma phase shift of the pair, averaged across asymmetric electrode pairs. Stars indicate significant correlation values (signed rank test; <i>p</i> < .05). Data available at <a href=\"http://dx.doi.org/10.6084/m9.figshare.1460872\" target=\"_blank\">http://dx.doi.org/10.6084/m9.figshare.1460872</a>.</p>", "links"=>[], "tags"=>["gamma wave propagation", "information transfer", "relationship", "gamma phases"], "article_id"=>1553000, "categories"=>["Uncategorised"], "users"=>["Michel Besserve", "Scott C. Lowe", "Nikos K. Logothetis", "Bernhard Schölkopf", "Stefano Panzeri"], "doi"=>"https://dx.doi.org/10.1371/journal.pbio.1002257.g006", "stats"=>{"downloads"=>0, "page_views"=>10, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Relationship_between_gamma_phase_shifts_and_movie_features_within_the_RFs_/1553000", "title"=>"Relationship between gamma phase shifts and movie features within the RFs.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2015-09-22 04:35:12"}
  • {"files"=>["https://ndownloader.figshare.com/files/2284391"], "description"=>"<p>(A) Example of the temporal dynamics of phase shifts for an example electrode pair (from session d04nm2), smoothed (with circular average) over 300 ms sliding windows. Hue encoding is the same as in <a href=\"http://www.plosbiology.org/article/info:doi/10.1371/journal.pbio.1002257#pbio.1002257.g003\" target=\"_blank\">Fig 3A</a>. In addition, intensity encodes PLV (see text). The red arrows indicate periods of reliable modulation of the phase difference by the stimulus. (B) Sensory information carried by several features of the gamma oscillations averaged across pairs of electrodes for each session. Left and center bars indicate the sensory information carried by gamma phase and gamma phase shifts, respectively. Right bars indicate the additional sensory information carried by phase shifts combined with power features, with respect to sensory information carried by power alone. Stars indicate significantly positive quantities (<i>t</i> test between actual information values and bootstrapped information values, <i>p</i>-values Bonferroni-corrected). Data available at <a href=\"http://dx.doi.org/10.6084/m9.figshare.1460872\" target=\"_blank\">http://dx.doi.org/10.6084/m9.figshare.1460872</a>.</p>", "links"=>[], "tags"=>["gamma wave propagation", "information transfer", "relationship", "gamma phases"], "article_id"=>1552998, "categories"=>["Uncategorised"], "users"=>["Michel Besserve", "Scott C. Lowe", "Nikos K. Logothetis", "Bernhard Schölkopf", "Stefano Panzeri"], "doi"=>"https://dx.doi.org/10.1371/journal.pbio.1002257.g004", "stats"=>{"downloads"=>0, "page_views"=>14, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Shifts_of_gamma_phase_are_dynamically_modulated_by_the_visual_stimuli_/1552998", "title"=>"Shifts of gamma phase are dynamically modulated by the visual stimuli.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2015-09-22 04:35:12"}
  • {"files"=>["https://ndownloader.figshare.com/files/2284387"], "description"=>"<p>(A) Principle of the calculation of TE quantifying the influence of phase at a “sending” recording site on the spiking activity at another “receiving” site. TE quantifies the information carried by the past values of the gamma phase at the sending site (the putative causal variable) about the current spiking activity at the receiving site (green arrow), while conditioning on the value of the past spiking activity at the receiving site (purple arrow). (B) TE values (Z-score units) averaged across all pairs of electrodes and sessions, during spontaneous activity and movie stimulation. Error bars indicate standard error (SE). Stars indicate significant increases during movie stimulation with respect to spontaneous activity (<i>t</i> test). (C) Spatial asymmetry ratio of TE values averaged across all couples of electrodes and sessions, during spontaneous activity and movie stimulation. Error bars indicate SE. (D) Histogram of TE values across all pairs of electrodes in all sessions, cropped to the 95th percentile. The electrode pairs were divided into four equipopulated ranges of interelectrode distances. (E) TE values (averaged across all pairs of electrodes in all sessions) quantifying the causal impact of phases of several frequency bands (whose frequency range is indicated in figure legend) during spontaneous activity and movie stimulation. Error bars indicate SE. Data available at <a href=\"http://dx.doi.org/10.6084/m9.figshare.1460872\" target=\"_blank\">http://dx.doi.org/10.6084/m9.figshare.1460872</a>.</p>", "links"=>[], "tags"=>["gamma wave propagation", "information transfer", "relationship", "gamma phases"], "article_id"=>1552994, "categories"=>["Uncategorised"], "users"=>["Michel Besserve", "Scott C. Lowe", "Nikos K. Logothetis", "Bernhard Schölkopf", "Stefano Panzeri"], "doi"=>"https://dx.doi.org/10.1371/journal.pbio.1002257.g002", "stats"=>{"downloads"=>0, "page_views"=>14, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Causal_impact_of_gamma_phase_on_neural_activity_at_other_locations_/1552994", "title"=>"Causal impact of gamma phase on neural activity at other locations.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2015-09-22 04:35:12"}
  • {"files"=>["https://ndownloader.figshare.com/files/2284390"], "description"=>"<p>(A) Illustration of the meaning of the sign of the phase shift under our conventions. The ordering of the electrodes used to compute phase differences is illustrated on the left. At each time point, we compute the phase of the gamma-band-passed LFP in the receiving electrode, and we subtract it from the value of the phase of the gamma-band-passed LFP at the sending electrode. The cartoon on the right illustrates that positive (respectively negative) phase shifts indicate that the gamma oscillation at the sending side leads (respectively lags behind) the gamma oscillation at the receiving site. (B) Spearman’s correlation coefficient between the gamma phase shift and TE transferred between gamma phase at the sending site and MUA at the receiving site, computed separately for each recording session. Stars denote significant values. (C) Mean phase shift histogram for two groups of electrode pairs: on the left for strongly asymmetric pairs (shift is measured in the leading direction of causation). On the right, the histogram for symmetric pairs is shown. (D) Example of simultaneously-recorded LFP traces in the gamma-band for three aligned recording sites. Each site is color-coded. As schematized by the arrows in the left hand side, both blue and green recording sites were receiving sites, forming a strongly asymmetric pair with the sending recording site in red. During this time period, the time courses of each electrode (each plotted with the color of the corresponding electrode) exhibit ordered phase shift whose sign is consistent with wave propagation from the sending site to the receiving ones (see location of maxima corresponding to the zero phase of each signal, indicated by colored vertical bars). (E) Phase shift against projected interelectrode distance along the direction of causation. Gray lines indicate plots for individual directions of dominant propagation in all sessions. Approximation by cubic spline regression of the pooled data is shown as a solid blue line. The dashed blue line is the tangent of this regression function at the origin. The slope of the tangent is indicated. Data available at <a href=\"http://dx.doi.org/10.6084/m9.figshare.1460872\" target=\"_blank\">http://dx.doi.org/10.6084/m9.figshare.1460872</a>.</p>", "links"=>[], "tags"=>["gamma wave propagation", "information transfer", "relationship", "gamma phases"], "article_id"=>1552997, "categories"=>["Uncategorised"], "users"=>["Michel Besserve", "Scott C. Lowe", "Nikos K. Logothetis", "Bernhard Schölkopf", "Stefano Panzeri"], "doi"=>"https://dx.doi.org/10.1371/journal.pbio.1002257.g003", "stats"=>{"downloads"=>0, "page_views"=>21, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Spatial_phase_shifts_/1552997", "title"=>"Spatial phase shifts.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2015-09-22 04:35:12"}

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{"start_date"=>"2015-01-01T00:00:00Z", "end_date"=>"2015-12-31T00:00:00Z", "subject_areas"=>[]}
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