All articles tagged with #eeg
A subset of dying patients and rodents show a transient, high-amplitude gamma-band surge on EEG after cardiac arrest, with unusually strong cross-regional brain coordination. While this activity is real and reproducible in observed cases, scientists caution that its relation to consciousness or near-death experiences is not proven, and the evidence is limited by small samples and methodological challenges.
Yale scientists used full-head EEG to monitor patients under propofol anesthesia and found the brain can enter states that resemble both sleep and coma, challenging the idea that anesthesia is simply deep sleep. The findings could guide better, individualized anesthesia care to minimize postoperative cognitive effects and push toward a sleep-like brain state during procedures.
A Yale-led study using full-head EEG recordings shows anesthesia does not simply put the brain to sleep; instead, anesthetized brains can exhibit sleep-like and coma-like patterns in different regions, challenging the sleep-vs-coma dichotomy and highlighting the potential for real-time brain monitoring to tailor anesthesia and reduce post-surgical cognitive effects.
A study with 92 participants using Edison-inspired wake interruptions found four mental states (C1–C4) that appear across wakefulness, sleep onset, and light sleep, including a bizarre dream-like C3 with a neural signature of reduced frontal–occipital connectivity. This shows dreaming can occur while awake, challenges the strict wake/sleep divide, and has implications for paradoxical insomnia and creative insight during wake–sleep transitions.
A Shanghai Jiao Tong University study shows that closing the eyes actually impairs detecting sounds in noisy settings, while watching a related video improves auditory detection by about 3 dB. EEG data suggest eye closure triggers inward focus and overfiltering of sounds, whereas visual input helps anchor the auditory system to the external world, with implications for hearing aids and real-life listening.
A study with 25 volunteers found that keeping eyes open and viewing related visuals enhances hearing in noisy environments, while closing eyes makes it harder to detect sounds. EEG data showed eye closure increases suppression of background noise, whereas visual input—especially videos—helps anchor auditory perception. Participants were tested under four visual conditions (eyes closed, blank screen, still image, video) with several target sounds in 70 dB noise, revealing progressively better detection with more engaging visuals. The work, published in The Journal of the Acoustical Society of America, suggests visual engagement can improve auditory sensitivity even in noisy settings.
California startup Sabi is building a noninvasive brain-computer interface worn as a beanie that translates imagined speech into on-screen text, aiming for about 30 words per minute with a high-density EEG sensor array and a consumer-friendly design, backed by end-to-end encryption and a large-scale brain foundation model, with a product expected by year-end.
An EEG study comparing expert echolocators to sighted participants shows that returning echoes help the brain build a spatial map of the surroundings, with the best performance from individuals who were blind from an early age. Echo-based perception improves over successive clicks, engaging both auditory and visual brain pathways and illustrating brain plasticity when vision is absent.
A multinational study introduces Xi–αNET, a generative model that links EEG signals (the background ξ and alpha rhythms) to the brain’s physical wiring and axonal conduction delays across ages 5–100 using the HarMNqEEG dataset. The findings show alpha frequency scales with myelin-driven conduction speed, producing a U-shaped trajectory of conduction delays with age and slower rhythms in older adults; the model also detects Parkinson’s-related alpha slowing, highlighting potential EEG-based brain-health benchmarks and early disease flagging via normative charts.
A meta-analysis of 33 studies with 2,101 participants finds exposure to nature—outdoors, virtual reality, or imagined scenes—reduces negative emotions and supports brain health, with EEG and other neuroimaging data showing a more balanced emotional state. The researchers advocate integrating ‘Nature Rx’ into urban design to protect the population’s brain capital as urbanization rises.
A new PLOS Biology study with 44 adults shows that feeling of deep sleep isn’t governed only by slow brain waves. During repeated awakenings in NREM2, immersive, emotionally intense dreams were linked to a stronger subjective sense of deep sleep, even when wake-like brain activity was present, while abstract, thought-like dreams correlated with shallower sleep. This suggests the dream experience itself can shape perceived sleep depth and may help explain variability in restfulness across different sleep durations.
An EEG study of 25 healthy volunteers shows psilocybin shifts the brain from a resting state to a dynamically engaged pattern by reducing slow theta/alpha power and increasing fast beta/gamma activity, with enhanced connectivity in the default mode network and parietal networks that correlates with the intensity of the psychedelic experience. Baseline fast-wave activity in frontal/emotional regions also predicted response to the drug. Using a double-blind, randomized crossover design (10–20 mg psilocybin vs placebo), researchers highlight potential biomarkers to guide psychedelic-assisted therapies, while noting limitations from the small, healthy-sample size and the need for clinical population studies and autonomic markers like heart-rate variability.
In a study of 63 adults (32 with ADHD, 31 controls), ADHD participants showed more sleep-like slow waves during a sustained attention task—especially in fronto-central brain regions—and these waves predicted missed responses and variable reaction times. The findings support the idea of 'local sleep' during wakefulness as a neural mechanism for ADHD inattention and point to sleep-based interventions and EEG biomarkers, though causality isn’t proven and the results come from a lab task.
New findings in The Journal of Neuroscience report that breathing timing can influence memory retrieval. In 18 young adults, EEG and a breath sensor linked brain alpha/beta oscillations and memory reactivation to the respiratory cycle: recalling an image cue was more accurate when the cue appeared during inhalation, with memory processing aligning to exhalation. Stronger breath-brain coupling predicted better memory scores, suggesting respiration acts as a scaffold for episodic retrieval. Authors caution that effects are modest and causality isn’t proven, and results reflect spontaneous breathing rather than deliberate breathing exercises.
New UNSW research provides the strongest evidence to date that auditory hallucinations in schizophrenia arise when the brain mispredicts its own inner speech, treating thoughts as external voices. EEG tests across three groups (recent AVH, other schizophrenia patients, and healthy controls) showed healthy individuals reduce brain activity for matched imagined/actual sounds, while those currently hearing voices show the opposite pattern, suggesting a disruption in the brain's prediction mechanism and offering a potential biomarker for psychosis and earlier detection.