Matthew D. Johnson

Prefrontal cortical pathways mediating cognitive control enhancement from internal capsule stimulation

This study identifies right dorsal prefrontal cortical pathways mediating cognitive control improvements from VCVS DBS.

Impairment of Neuronal Activity in the Dorsolateral Prefrontal Cortex Occurs Early in Parkinsonism

This study examines how neuronal activity in the dorsolateral prefrontal cortex changes in parkinsonism using nonhuman primates and finds early impairment in task-related firing rates.

Mapping polarization-sensitive optical coherence tomography and ultra-high-field diffusion MRI in the macaque brain

The paper compares microstructure and fiber orientation measurements from polarization-sensitive OCT and ultra-high-field dMRI in macaque brains and demonstrates a GAN for improving MRI resolution using OCT data.

Model-Based Closed-Loop Control of Thalamic Deep Brain Stimulation

This paper proposes a model-based closed-loop DBS controller for essential tremor using EMG signals, showing it finds DBS frequencies that align with clinical studies.

Uncovering network mechanism underlying thalamic deep brain stimulation

The paper investigates the network mechanisms underlying thalamic deep brain stimulation and identifies key features of spiking activity in response to high-frequency stimulation.

Classification of electrically-evoked compound action potentials in the parkinsonian subthalamic nucleus region

The paper uses ECAP features to classify electrode locations in the STN and surrounding regions to improve DBS therapy for Parkinson's disease.

Parkinsonian gait effects with DBS are associated with pallido-peduncular axis activation

This study investigates how specific neuronal pathways around the subthalamic nucleus affect gait in Parkinson's disease patients undergoing DBS, finding associations between pathway activation and step length changes.

High-frequency oscillations in the internal globus pallidus: a pathophysiological biomarker in Parkinson's disease?

This study identifies high-frequency oscillations in the internal globus pallidus as a pathophysiological feature of Parkinson's disease using clinical and preclinical data.

Real-time suppression and amplification of frequency-specific neural activity using stimulation evoked oscillations

This study develops a closed-loop neural control framework to suppress or amplify specific low-frequency oscillations in real-time using electrical stimulation in nonhuman primates.

Dose-dependent effects of transcranial alternating current stimulation on spike timing in awake nonhuman primates

This study shows that transcranial alternating current stimulation (TACS) modulates spike timing in awake nonhuman primates in a dose-dependent manner, with higher intensities increasing neuronal entrainment.