As acquired for anatomic reference (magnetization-prepared rapid gradient echo (MPRAGE); TR/TE/inversion time = 2,300/3.93/1,100 ms, flip angle = 12? 256 ?256 matrix, 1 mm isotropic voxels).Figure 2. (a) Example of magnetic resonance spectroscopy (1H-MRS) voxel placement in the left substantia nigra (SN; 13 ?13 ?13 mm) overlaid on an axial magnetization transfer contrast image. Insert shows the Pleconaril site midbrain without the 1H-MRS voxel. Images are displayed in VER-52296 site Neurological convention. (b) Sample 1H-MRS spectrum obtained from the left SN; the black line is a spectrum (640 averages), the red line is an overlay of the spectral fit. Cho, choline; Cr, creatine; Glx, glutamate+glutamine; NAA, N-acetyl-aspartate. (c) Glx in the left SN in healthy controls and patients with schizophrenia. Horizontal lines indicate group means.Figure 1. (a) Participants selected either a large reward of 30?or a smaller reward of 10?by pushing a right or left box. Although the probability of receiving 10?remained constant at 0.9, the probability of receiving 30?varied between runs (0.1, 0.33, or 0.9). After the first 10 trials of each run, participants developed an expected value (EV) (probability ?reward magnitude (RM)) of their choice. Prediction error (PE) was calculated as the difference between RM and EV for each trial (that is, if EV = 9?(0.9 ?10?, but RM = 0? then PE = – 9). (b) Three conditions were presented. During Decision, subjects selected the left or right box corresponding to a 10?or 30?choice. For a given run, the left/right position of the 10?30?choice did not change. During Decision Display, the color of the box selected changed, indicating that a response was made. Feedback was received during Reward Presentation (RM of 0? 10? or 30?.npj Schizophrenia (2015) 14001 ?2015 Schizophrenia International Research Group/Nature Publishing GroupSN glutamate and prediction error in schizophrenia DM White et alvariables. A general linear model was used to determine whether HC and SZ performed the task in a similar manner. Each participant’s response during every trial was binarized to indicate a left or a right button press. These values were entered as the dependent variable in a linear regression. Fixed independent factors were entered to define each of the six sessions and each of the 25 trials. Group was entered as a random factor and participant identification was entered as a covariate. A planned contrast was conducted for the outcome of diagnostic status as a predictor of trial response. regressor was orthogonalized to the reward presentation to ensure it was uniquely specified and validly estimated.23 Contrasts were carried forward to the second level for within- and between-group analyses. Whole-brain analyses were corrected for multiple comparisons using false discovery rate with significance level set to Po0.01. In addition, we conducted region of interest analyses using masks from the WFU pickatlas24 for the midbrain/SN (TD lobes) and bilateral ventral striatum/nucleus accumbens (IBASPM 71). The significance level was set to Po0.05 using small-volume corrections (SVC).fMRIData were analyzed using SPM8 (Wellcome Trust, London, UK). Preprocessing included slice-timing correction, realignment, artifact and motion correction using ArtRepair, coregistration to the structural scan, normalization to Montreal Neurological Institute space, and smoothing (4 mm) using DARTEL.22 First-level analyses were conducted for each participant with a general linear model t.As acquired for anatomic reference (magnetization-prepared rapid gradient echo (MPRAGE); TR/TE/inversion time = 2,300/3.93/1,100 ms, flip angle = 12? 256 ?256 matrix, 1 mm isotropic voxels).Figure 2. (a) Example of magnetic resonance spectroscopy (1H-MRS) voxel placement in the left substantia nigra (SN; 13 ?13 ?13 mm) overlaid on an axial magnetization transfer contrast image. Insert shows the midbrain without the 1H-MRS voxel. Images are displayed in neurological convention. (b) Sample 1H-MRS spectrum obtained from the left SN; the black line is a spectrum (640 averages), the red line is an overlay of the spectral fit. Cho, choline; Cr, creatine; Glx, glutamate+glutamine; NAA, N-acetyl-aspartate. (c) Glx in the left SN in healthy controls and patients with schizophrenia. Horizontal lines indicate group means.Figure 1. (a) Participants selected either a large reward of 30?or a smaller reward of 10?by pushing a right or left box. Although the probability of receiving 10?remained constant at 0.9, the probability of receiving 30?varied between runs (0.1, 0.33, or 0.9). After the first 10 trials of each run, participants developed an expected value (EV) (probability ?reward magnitude (RM)) of their choice. Prediction error (PE) was calculated as the difference between RM and EV for each trial (that is, if EV = 9?(0.9 ?10?, but RM = 0? then PE = – 9). (b) Three conditions were presented. During Decision, subjects selected the left or right box corresponding to a 10?or 30?choice. For a given run, the left/right position of the 10?30?choice did not change. During Decision Display, the color of the box selected changed, indicating that a response was made. Feedback was received during Reward Presentation (RM of 0? 10? or 30?.npj Schizophrenia (2015) 14001 ?2015 Schizophrenia International Research Group/Nature Publishing GroupSN glutamate and prediction error in schizophrenia DM White et alvariables. A general linear model was used to determine whether HC and SZ performed the task in a similar manner. Each participant’s response during every trial was binarized to indicate a left or a right button press. These values were entered as the dependent variable in a linear regression. Fixed independent factors were entered to define each of the six sessions and each of the 25 trials. Group was entered as a random factor and participant identification was entered as a covariate. A planned contrast was conducted for the outcome of diagnostic status as a predictor of trial response. regressor was orthogonalized to the reward presentation to ensure it was uniquely specified and validly estimated.23 Contrasts were carried forward to the second level for within- and between-group analyses. Whole-brain analyses were corrected for multiple comparisons using false discovery rate with significance level set to Po0.01. In addition, we conducted region of interest analyses using masks from the WFU pickatlas24 for the midbrain/SN (TD lobes) and bilateral ventral striatum/nucleus accumbens (IBASPM 71). The significance level was set to Po0.05 using small-volume corrections (SVC).fMRIData were analyzed using SPM8 (Wellcome Trust, London, UK). Preprocessing included slice-timing correction, realignment, artifact and motion correction using ArtRepair, coregistration to the structural scan, normalization to Montreal Neurological Institute space, and smoothing (4 mm) using DARTEL.22 First-level analyses were conducted for each participant with a general linear model t.
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