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Céline Cappe - One of the best experts on this subject based on the ideXlab platform.

  • electrophysiological correlates of visual backward masking in high schizotypic personality traits participants
    Psychiatry Research-neuroimaging, 2017
    Co-Authors: Ophelie Favrod, Céline Cappe, Christine Mohr, Guillaume Sierro, Maya Roinishvili, Eka Chkonia, Michael H. Herzog
    Abstract:

    Visual backward masking is strongly deteriorated in patients with schizophrenia. Masking deficits are associated with strongly reduced amplitudes of the Global Field power in the EEG. Healthy participants who scored high in cognitive disorganization (a schizotypic trait) were impaired in backward masking compared to participants who scored low. Here, we show that the Global Field power is also reduced in healthy participants scoring high (n=25) as compared to low (n=20) in cognitive disorganization, though quantitatively less pronounced than in patients (n=10). These results point to similar mechanisms underlying visual backward masking deficits along the schizophrenia spectrum.

Eka Chkonia - One of the best experts on this subject based on the ideXlab platform.

  • electrophysiological correlates of visual backward masking in patients with bipolar disorder
    Psychiatry Research-neuroimaging, 2020
    Co-Authors: Simona Garobbio, Ophelie Favrod, Maya Roinishvili, Eka Chkonia, Janir Nuno Da Cruz, Andreas Brand, Michael H. Herzog
    Abstract:

    Abstract In visual backward masking (VBM), a target is followed by a mask that decreases target discriminability. Schizophrenia patients (SZ) show strong and reproducible masking impairments, which are associated with reduced EEG amplitudes. Patients with bipolar disorder (BP) show masking deficits, too. Here, we investigated the neural EEG correlates of VBM in BP. 122 SZ, 94 unaffected controls, and 38 BP joined a standard VBM experiment. 123 SZ, 94 unaffected controls and 16 BP joined a corresponding EEG experiment, analyzed in terms of Global Field power. As in previous studies, SZ and BP show strong masking deficits. Importantly and similarly to SZ, BP show decreased Global Field power amplitudes at approximately 200 ms after the target onset, compared to controls. These results suggest that VBM deficits are not specific for schizophrenia but for a broader range of functional psychoses. Potentially, both SZ and BP show deficient target enhancement.

  • electrophysiological correlates of visual backward masking in patients with bipolar disorder
    bioRxiv, 2020
    Co-Authors: Simona Garobbio, Ophelie Favrod, Maya Roinishvili, Eka Chkonia, Andreas Brand, Janir R Da Cruz, Michael H. Herzog
    Abstract:

    Background: In visual backward masking (VBM), a target is followed by a mask that decreases target discriminability. Schizophrenia patients (SZ) show strong and reproducible masking impairments, which are associated with reduced EEG amplitudes. Patients with bipolar disorder (BP) show masking deficits, too. Here, we investigated the neural EEG correlates of VBM in BP. Methods: 122 SZ, 94 unaffected controls, and 38 BP joined a standard VBM experiment. 123 SZ, 94 unaffected controls and 16 BP joined a corresponding EEG experiment, analyzed in terms of the Global Field power. Results: As in previous studies, SZ and BP show strong masking deficits. Importantly and similarly to SZ, BP show decreased Global Field power amplitudes at approximately 200 ms after the target onset, compared to controls. Conclusions: These results suggest that VBM deficits are not specific for schizophrenia but for a broader range of functional psychoses. Potentially, both SZ and BP show deficient target enhancement.

  • electrophysiological correlates of visual backward masking in high schizotypic personality traits participants
    Psychiatry Research-neuroimaging, 2017
    Co-Authors: Ophelie Favrod, Céline Cappe, Christine Mohr, Guillaume Sierro, Maya Roinishvili, Eka Chkonia, Michael H. Herzog
    Abstract:

    Visual backward masking is strongly deteriorated in patients with schizophrenia. Masking deficits are associated with strongly reduced amplitudes of the Global Field power in the EEG. Healthy participants who scored high in cognitive disorganization (a schizotypic trait) were impaired in backward masking compared to participants who scored low. Here, we show that the Global Field power is also reduced in healthy participants scoring high (n=25) as compared to low (n=20) in cognitive disorganization, though quantitatively less pronounced than in patients (n=10). These results point to similar mechanisms underlying visual backward masking deficits along the schizophrenia spectrum.

Michael H. Herzog - One of the best experts on this subject based on the ideXlab platform.

  • electrophysiological correlates of visual backward masking in patients with bipolar disorder
    Psychiatry Research-neuroimaging, 2020
    Co-Authors: Simona Garobbio, Ophelie Favrod, Maya Roinishvili, Eka Chkonia, Janir Nuno Da Cruz, Andreas Brand, Michael H. Herzog
    Abstract:

    Abstract In visual backward masking (VBM), a target is followed by a mask that decreases target discriminability. Schizophrenia patients (SZ) show strong and reproducible masking impairments, which are associated with reduced EEG amplitudes. Patients with bipolar disorder (BP) show masking deficits, too. Here, we investigated the neural EEG correlates of VBM in BP. 122 SZ, 94 unaffected controls, and 38 BP joined a standard VBM experiment. 123 SZ, 94 unaffected controls and 16 BP joined a corresponding EEG experiment, analyzed in terms of Global Field power. As in previous studies, SZ and BP show strong masking deficits. Importantly and similarly to SZ, BP show decreased Global Field power amplitudes at approximately 200 ms after the target onset, compared to controls. These results suggest that VBM deficits are not specific for schizophrenia but for a broader range of functional psychoses. Potentially, both SZ and BP show deficient target enhancement.

  • electrophysiological correlates of visual backward masking in patients with bipolar disorder
    bioRxiv, 2020
    Co-Authors: Simona Garobbio, Ophelie Favrod, Maya Roinishvili, Eka Chkonia, Andreas Brand, Janir R Da Cruz, Michael H. Herzog
    Abstract:

    Background: In visual backward masking (VBM), a target is followed by a mask that decreases target discriminability. Schizophrenia patients (SZ) show strong and reproducible masking impairments, which are associated with reduced EEG amplitudes. Patients with bipolar disorder (BP) show masking deficits, too. Here, we investigated the neural EEG correlates of VBM in BP. Methods: 122 SZ, 94 unaffected controls, and 38 BP joined a standard VBM experiment. 123 SZ, 94 unaffected controls and 16 BP joined a corresponding EEG experiment, analyzed in terms of the Global Field power. Results: As in previous studies, SZ and BP show strong masking deficits. Importantly and similarly to SZ, BP show decreased Global Field power amplitudes at approximately 200 ms after the target onset, compared to controls. Conclusions: These results suggest that VBM deficits are not specific for schizophrenia but for a broader range of functional psychoses. Potentially, both SZ and BP show deficient target enhancement.

  • electrophysiological correlates of visual backward masking in high schizotypic personality traits participants
    Psychiatry Research-neuroimaging, 2017
    Co-Authors: Ophelie Favrod, Céline Cappe, Christine Mohr, Guillaume Sierro, Maya Roinishvili, Eka Chkonia, Michael H. Herzog
    Abstract:

    Visual backward masking is strongly deteriorated in patients with schizophrenia. Masking deficits are associated with strongly reduced amplitudes of the Global Field power in the EEG. Healthy participants who scored high in cognitive disorganization (a schizotypic trait) were impaired in backward masking compared to participants who scored low. Here, we show that the Global Field power is also reduced in healthy participants scoring high (n=25) as compared to low (n=20) in cognitive disorganization, though quantitatively less pronounced than in patients (n=10). These results point to similar mechanisms underlying visual backward masking deficits along the schizophrenia spectrum.

G Hornig - One of the best experts on this subject based on the ideXlab platform.

  • dynamics of braided coronal loops i onset of magnetic reconnection
    Astronomy and Astrophysics, 2010
    Co-Authors: A L Wilmotsmith, D I Pontin, G Hornig
    Abstract:

    Aims. The response of the solar coronal magnetic Field to small-scale photospheric boundary motions including the possible formation of current sheets via the Parker scenario is one of open questions of solar physics. Here we address the problem via a numerical simulation. Methods. The three-dimensional evolution of a braided magnetic Field which is initially close to a force-free state is followed using a resistive MHD code. Results. A long-wavelength instability takes place and leads to the formation of two thin current layers. Magnetic reconnection occurs across the current sheets with three-dimensional features shown, including an elliptic magnetic Field structure about the reconnection site, and results in an untwisting of the Global Field structure.

  • dynamics of braided coronal loops i onset of magnetic reconnection
    arXiv: Solar and Stellar Astrophysics, 2010
    Co-Authors: A L Wilmotsmith, D I Pontin, G Hornig
    Abstract:

    The response of the solar coronal magnetic Field to small-scale photospheric boundary motions including the possible formation of current sheets via the Parker scenario is one of open questions of solar physics. Here we address the problem via a numerical simulation. The three-dimensional evolution of a braided magnetic Field which is initially close to a force-free state is followed using a resistive MHD code. A long-wavelength instability takes place and leads to the formation of two thin current layers. Magnetic reconnection occurs across the current sheets with three-dimensional features shown, including an elliptic magnetic Field structure about the reconnection site, and results in an untwisting of the Global Field structure.

Ophelie Favrod - One of the best experts on this subject based on the ideXlab platform.

  • electrophysiological correlates of visual backward masking in patients with bipolar disorder
    Psychiatry Research-neuroimaging, 2020
    Co-Authors: Simona Garobbio, Ophelie Favrod, Maya Roinishvili, Eka Chkonia, Janir Nuno Da Cruz, Andreas Brand, Michael H. Herzog
    Abstract:

    Abstract In visual backward masking (VBM), a target is followed by a mask that decreases target discriminability. Schizophrenia patients (SZ) show strong and reproducible masking impairments, which are associated with reduced EEG amplitudes. Patients with bipolar disorder (BP) show masking deficits, too. Here, we investigated the neural EEG correlates of VBM in BP. 122 SZ, 94 unaffected controls, and 38 BP joined a standard VBM experiment. 123 SZ, 94 unaffected controls and 16 BP joined a corresponding EEG experiment, analyzed in terms of Global Field power. As in previous studies, SZ and BP show strong masking deficits. Importantly and similarly to SZ, BP show decreased Global Field power amplitudes at approximately 200 ms after the target onset, compared to controls. These results suggest that VBM deficits are not specific for schizophrenia but for a broader range of functional psychoses. Potentially, both SZ and BP show deficient target enhancement.

  • electrophysiological correlates of visual backward masking in patients with bipolar disorder
    bioRxiv, 2020
    Co-Authors: Simona Garobbio, Ophelie Favrod, Maya Roinishvili, Eka Chkonia, Andreas Brand, Janir R Da Cruz, Michael H. Herzog
    Abstract:

    Background: In visual backward masking (VBM), a target is followed by a mask that decreases target discriminability. Schizophrenia patients (SZ) show strong and reproducible masking impairments, which are associated with reduced EEG amplitudes. Patients with bipolar disorder (BP) show masking deficits, too. Here, we investigated the neural EEG correlates of VBM in BP. Methods: 122 SZ, 94 unaffected controls, and 38 BP joined a standard VBM experiment. 123 SZ, 94 unaffected controls and 16 BP joined a corresponding EEG experiment, analyzed in terms of the Global Field power. Results: As in previous studies, SZ and BP show strong masking deficits. Importantly and similarly to SZ, BP show decreased Global Field power amplitudes at approximately 200 ms after the target onset, compared to controls. Conclusions: These results suggest that VBM deficits are not specific for schizophrenia but for a broader range of functional psychoses. Potentially, both SZ and BP show deficient target enhancement.

  • electrophysiological correlates of visual backward masking in high schizotypic personality traits participants
    Psychiatry Research-neuroimaging, 2017
    Co-Authors: Ophelie Favrod, Céline Cappe, Christine Mohr, Guillaume Sierro, Maya Roinishvili, Eka Chkonia, Michael H. Herzog
    Abstract:

    Visual backward masking is strongly deteriorated in patients with schizophrenia. Masking deficits are associated with strongly reduced amplitudes of the Global Field power in the EEG. Healthy participants who scored high in cognitive disorganization (a schizotypic trait) were impaired in backward masking compared to participants who scored low. Here, we show that the Global Field power is also reduced in healthy participants scoring high (n=25) as compared to low (n=20) in cognitive disorganization, though quantitatively less pronounced than in patients (n=10). These results point to similar mechanisms underlying visual backward masking deficits along the schizophrenia spectrum.