Papers

Researchers proposed an attention-driven hybrid interaction model combining brain-computer interfaces and virtual reality, then evaluated it in three rounds of user experiments. The study reported user experience comparable to traditional VR control methods. Named Attention-BrainVerse, the model combines attention-centered input, adaptive processing and visual feedback to address usability challenges. It uses dynamic thresholds and continuous difficulty adjustment, with feedback mechanisms including attention visualization. The reported comparison concerns user experience, not equivalence in neural decoding accuracy, operating speed or hardware cost.

Authors at the University of California, San Francisco and UC Berkeley discuss how continuous closed-loop reinforcement interacts with sensory feedback when people learn to control human-machine interfaces. The Neuron commentary covers BCIs, augmented reality devices and hand prostheses.

A collaboration involving Caltech recorded single-neuron activity in three participants with tetraplegia while applying vibration to a sensate upper-limb region. Primary somatosensory cortex responses tracked stimulus amplitude more closely, while posterior parietal activity was more strongly associated with perception and confidence. Only two participants provided confidence ratings. The preprint distinguishes associations with physical input and subjective perception; it does not establish that one brain region alone generates conscious touch.

Rats implanted with microwire arrays showed an exponential-like fall in intracortical microstimulation (ICMS) perception thresholds from weeks 5 to 12, then held near a fitted asymptote of about 1.1 nC/ph per electrode across 10 stimulating electrodes through week 30 in animals that retained detectable percepts. Correct responses to the conditioned stimulus stabilized at roughly 90%. Neither the arrays' electrophysiological nor their electrochemical properties explained the threshold trend across animals. Gene expression in implanted tissue showed elevated Gfap and Cd68 alongside reduced NeuN and Bdnf, consistent with earlier neuroinflammation findings. Two animals lost sensation over the 30-week period.

Researchers in Germany fitted participants with lightweight EEG electrodes around the ear and a portable hearing aid research platform, then tested auditory attention while they sat and walked. Speech reconstructed from the EEG followed earlier lab findings: most accurate for a single talker, then the attended talker of two, and least for the ignored one. Walking introduced a speech-synchronized artifact, possibly from hearing aid cables touching the electrodes, which affected accuracy; the researchers conclude feasibility is shown only for stationary settings.

Researchers implanted an intracortical brain-computer interface in a participant with complete tetraplegia that reads movement intent from motor cortex to drive muscle electrical stimulation for grasping, while hand-mounted force sensors send touch information back by stimulating the sensory cortex. A separate channel pairs spinal cord stimulation with sensory input to promote neural plasticity. The participant could self-feed and pick up fragile objects. Improvements in elbow flexion strength and wrist sensation persisted after stimulation stopped, suggesting the system may be retraining neural pathways rather than only replacing them.

A collaboration involving Peking University converted dynamic natural movie frames into spatiotemporal patterns of optogenetic stimulation in awake mice, then reconstructed movie frames from responses in the primary visual cortex. Comparing natural viewing with artificial stimulation, they found that stimulation evoked broadly comparable cortical dynamics and aligned representations. A deep learning model reconstructed frames from cortical signals under both conditions. The animal study offers a proof of concept for evaluating how visual cortical prostheses might translate images into stimulation patterns. It does not establish that stimulation produced the corresponding visual experience in mice or restored vision in humans.

Purdue University researchers compared sparse and redundant intracortical microstimulation encoding in eight mice. Stimulating more electrodes simultaneously accelerated learning, shortened navigation trials and improved success rates and path efficiency when stimulation was combined with vision. The findings were released as a preprint.

The study proposes coating the gold pillar sidewalls of the PRIMA retinal prosthesis with titanium dioxide or platinum while protecting surrounding device regions. The approach combines photolithography and electrodeposition to address tissue contact with exposed gold while preserving surrounding implant functionality. The authors report that both coatings were biocompatible in in-vivo studies and prevented adverse retinal tissue reactions to gold. Titanium dioxide had a lower specific capacitance than platinum, which the authors say better limits sidewall current and directs charge injection mainly through the pillar tops. These findings concern electrode materials and interfaces, not demonstrated improvements in patients' vision from the new coatings.

US researchers using intracortical microelectrode arrays identified distinct neural patterns in the motor and somatosensory cortex of patients with spinal cord injury that separately encode the timing and force of grasping, offering new ideas for developing more precise brain-computer interface (BCI) systems.

An arXiv preprint introduces fMRI-Face, a Full-HD fMRI-video dataset, and fMRI2Face, a geometry-guided framework for reconstructing dynamic faces from brain activity. The method combines brain-derived appearance context with morphable 3D facial control in a neural-controlled video-diffusion pipeline. The work has not been peer reviewed.

An arXiv preprint adapts the computationally intensive MindEye2 pipeline for real-time reconstruction of perceived natural images from fMRI. Using the open-source RT-Cloud platform, the researchers decoded single-trial visual perception within seconds of image presentation and analyzed the factors behind performance changes from offline to real-time processing. The work has not been peer reviewed.

An early feasibility study followed five people with spinal cord injury, each implanted with two Blackrock NeuroPort arrays in somatosensory cortex. Across two to 10 years of implantation, more than 168 million intracortical stimulation pulses were delivered over 27 combined implant-years without a serious adverse event or direct harm to electrode health. An average of 64% ± 13% of electrodes still evoked touch, including 60% after 10 years in one participant.

Current hearing aids amplify every sound in a noisy room rather than the person a listener wants to hear. Using intracranial EEG in neurosurgical patients, researchers built a closed-loop system that decodes which talker a listener is attending to and amplifies that voice in real time. Across multiple experiments it improved speech intelligibility, reduced listening effort and was consistently preferred by subjects, and it followed both instructed and self-initiated shifts of attention.