Lars Ersland

GABA, Glutamate dynamics and BOLD observed during cognitive processing in psychosis patients with hallucinatory traits

The paper investigates GABA and Glutamate dynamics along with BOLD signals in psychosis patients with hallucinations during a cognitive task, finding baseline Glx differences and altered BOLD-Glx associations.

Modelling inter-shot variability for robust temporal sub-sampling of dynamic, GABA-edited MR spectroscopy data

This paper develops a model to reduce unwanted variance in GABA-edited MRS data while preserving functional dynamics, showing improved SNR and reduced variability in GABA+ estimates.

Linewidth-related bias in modelled concentration estimates from GABA-edited 1H-MRS

This study investigates how linewidth and SNR affect GABA+ concentration estimates from MRS data using six modelling algorithms, finding significant associations with Lorentzian linewidth.

GABA, glutamatergic dynamics and BOLD contrast concurrently assessed using functional MR spectroscopy during a cognitive task

This paper demonstrates a method to concurrently measure BOLD and metabolite changes during a cognitive task using fMRS, showing significant Glx increases and moderate BOLD correlation.

Comparison of seven modelling algorithms for GABA-edited 1H-MRS

The paper compares seven algorithms for modelling GABA-edited 1H-MRS data from 222 subjects across 20 sites, finding moderate agreement and highlighting the need for standardized parameters.

Dynamic switching between intrinsic and extrinsic mode networks as demands change from passive to active processing

The paper examines how brain networks shift between intrinsic and extrinsic modes during rest and active processing using fMRI data from visual tasks.

Neural activity precedes conscious awareness of being in or out of a transient hallucinatory state

The paper shows that neural activity in the ventro-medial frontal cortex precedes conscious awareness of entering or exiting a transient hallucinatory state.

Positive relation between arcuate fasciculus white matter fiber structure and severity of auditory hallucinations: A DTI tractography study

This study finds a positive correlation between arcuate fasciculus tract length and severity of auditory hallucinations in schizophrenia patients using DTI tractography.

Dynamic up- and down-regulation of the default (DMN) and extrinsic (EMN) mode networks during alternating task-on and task-off periods

The paper examines how the default mode network (DMN) and extrinsic mode network (EMN) dynamically change during task-on and task-off periods using fMRI data.