Vasileios Christopoulos

Distributed brain-spinal cord dynamics during micturition revealed by functional ultrasound imaging

This study uses functional ultrasound imaging to map brain and spinal cord activity during micturition in rats, revealing region-specific hemodynamic responses and decoding bladder pressure dynamics.

An integrative computational approach for obstacle avoidance during action selection

The paper develops a computational model to explain action selection in cluttered environments by integrating goal pursuit and obstacle avoidance through a weighted combination of control policies.

Human spinal cord activation during filling and emptying of the bladder

This study uses functional ultrasound imaging to observe spinal cord activity during bladder filling and emptying, identifying pressure-responsive regions correlated with bladder pressure.

Computational mechanism underlying switching of motor actions

The paper investigates the computational mechanisms of action switching, finding that it involves a pause mechanism after movement onset when target location is unknown, distinct from stopping processes.

Functional ultrasound neuroimaging reveals mesoscopic organization of saccades in the lateral intraparietal area of posterior parietal cortex

The paper uses functional ultrasound imaging to map directional tuning in the lateral intraparietal area, revealing mesoscopic organization of saccade directions across posterior parietal cortex.

A window to the brain: ultrasound imaging of human neural activity through a permanent acoustic window

This paper introduces a permanent acoustic window for high-resolution, non-invasive ultrasound imaging of human brain activity, demonstrating its use in mapping cortical responses to finger movement.

Decoding Motor Plans Using a Closed-Loop Ultrasonic Brain-Machine Interface

This study demonstrates a closed-loop ultrasonic brain-machine interface that enables nonhuman primates to control movements using real-time neurovascular activity predictions.

Comparison of image registration techniques in functional ultrasound imaging

This study compares image registration techniques for functional ultrasound imaging, finding that Imregdeform provides the best alignment of 2D fUSI brain data.

Frequency- and circuit- specific effects of septohippocampal deep brain stimulation in mice as measured by functional ultrasound imaging.

This study uses functional ultrasound imaging to show that septohippocampal DBS at theta frequency increases hippocampal CBV after stimulation offset, unlike high-frequency DBS.

A neurocomputational theory of action regulation predicts motor behavior in neurotypical individuals and patients with Parkinsons disease

This study develops a neurodynamical computational theory of action regulation and tests it in neurotypical individuals and Parkinson's disease patients, showing how disruptions in this mechanism lead to motor deficits.

Single Trial Decoding of Movement Intentions Using Functional Ultrasound Neuroimaging

This paper demonstrates the feasibility of using functional ultrasound (fUS) imaging to decode movement intentions for brain-machine interfaces in non-human primates.

What if you are not certain? A common computation underlying action selection, reaction time and confidence judgment

The paper investigates the computation underlying confidence judgment in dynamic action decisions, showing that action selection, reaction time, and confidence arise from a common mechanism of competing prepared actions.