Tag

Eeg

All articles tagged with #eeg

cognitive-science10 days ago•26 min saved

Brain uses a universal evidence-accumulation system for decisions, including new abstract rules

New research shows the centro-parietal positivity (CPP) EEG signal tracks evidence accumulation not only for sensory input but also for arbitrary, newly learned categories. In a drift-diffusion framework with 38 participants, moving lines farther from a hidden boundary led to faster drift rates and steeper CPP buildup, indicating a single, adaptable brain mechanism that handles both real and abstract decisions; motor cortex activity remained constant with task difficulty, and the study notes limitations and the need to test more complex, real-world categories.

via PsyPost|

#abstract-rules-learning #centro-parietal-positivity #cognitive-science

mental-health11 days ago•29 min saved

Caffeine and L-theanine may boost attention in teens with ADHD (not a replacement for meds)

A double-blind, placebo-controlled crossover study in 21 adolescents with ADHD found that a single high-dose combination of L-theanine and caffeine improved selective attention, reduced false alarms, and lessened progressive slowing of responses during a 12-minute task, with EEG suggesting faster target evaluation and greater neural resource allocation. While methylphenidate also reduced false alarms and sped responses, the L-theanine–caffeine combo did not replicate the same speed boost. The researchers caution the findings do not imply this combo should replace established ADHD treatments and call for larger, longer-term studies to assess real-world benefits and safety.

via psypost.org|

#adhd #caffeine #eeg

science1 month ago•8 min saved

Restoring Sleep in Alzheimer’s Model by Suppressing Brain Immune Cells

Researchers in a mouse model of Alzheimer's found microglia drive sleep loss; depleting most brain immune cells restored over two hours of nightly sleep and longer restorative sleep, even though amyloid plaques did not decrease, indicating microglial overactivity as a reversible sleep‑disruption driver. The work also points to portable EEG as a potential biomarker and explores repurposing existing drugs to calm microglia as possible therapies.

via ScienceDaily|

#alzheimers-disease #amyloid-plaques #eeg

science1 month ago•6 min saved

Brain can track two voices at once when switching attention, study finds

A PLOS Biology study using EEG shows that when people switch attention between two simultaneous voices, the brain briefly tracks both streams before settling on the new speaker. This overlap corresponds to a dip in alpha brainwaves, indicating mental effort, and researchers used large language models to model how listeners rebuild the conversational thread after each switch.

via Boing Boing|

#attention #auditory-processing #cognition

science1 month ago•8 min saved

Brain 'Static' May Underlie Everyday Speech Difficulties in Autism

A UVA-led study with 306 youths used 128-channel high-density EEG to isolate the brain's aperiodic (non-rhythmic) background activity, finding that autistic participants show altered aperiodic patterns consistent with higher neural noise. This neural noise was linked to poorer everyday verbal communication—not to vocabulary or grammar—suggesting a potential biomarker to monitor therapy effects rather than a diagnostic tool. While promising, findings need replication in minimally verbal individuals and should be combined with other imaging methods before clinical use.

via Neuroscience News|

#aperiodic-signal #autism #eeg

science2 months ago•13 min saved

Dying-Brain Gamma Burst Sparks Debate on Near-Death Imagery

A 2013 University of Michigan rat study found a brief, highly synchronized gamma-band surge in the 30 seconds after cardiac arrest, suggesting the dying brain remains highly coordinated and potentially linked to the vivid imagery reported in near-death experiences; later human data (2022 case and 2023 follow-ups) showed gamma activity in some dying patients, fueling debate about whether such brain activity underpins conscious experience or reflects other processes, while acknowledging the findings don’t settle the broader question of consciousness.

via Space Daily|

#cardiac-arrest #consciousness #eeg

science2 months ago•13 min saved

Hearing Persists in the Final Hours, EEG Study Finds

A 2020 University of British Columbia EEG study, published in Scientific Reports, found actively dying hospice patients still exhibit brain responses to sounds hours before death—through event-related potentials—suggesting the voices of loved ones in the room may reach them even when they are unresponsive. The finding lends neural support to hospice guidance to speak normally and play familiar sounds, though it does not prove subjective experience and the study’s small, variably conditioned sample limits broad conclusions.

via Space Daily|

#auditory-processing #eeg #end-of-life-care

sleep2 months ago•31 min saved

THC-CBD sleep study shows altered brain rhythms and delayed dreaming phase

In a small, blinded crossover trial of twenty adults with insomnia, a single oral dose of 10 mg THC plus 200 mg CBD shortened total sleep by about 25 minutes and cut REM sleep by roughly 34 minutes, while delaying REM onset by more than an hour. High-density EEG revealed calmer activity in lighter sleep stages but reduced slow-wave activity in deep sleep and increased fast rhythms in posterior regions during REM, indicating more nocturnal arousal and shallower sleep. Next-day cognitive tests were largely unchanged, though participants reported mild sleepiness. The study’s limitations—small sample size and one-night exposure—call for longer-term research on safety and tolerability of medicinal cannabis for sleep.

via PsyPost|

#cannabis #eeg #insomnia

health2 months ago•3 min saved

Evening Caffeine Trims Deep Sleep, Warns New Sleep Research

A review of 32 caffeine-related sleep studies shows caffeine reduces slow-wave, non-REM deep-sleep brain activity and increases wakeful sleep patterns, even when people get 7–9 hours of sleep or feel rested. The effects vary with dose and timing, and depend on individual sleep quality, suggesting total daily caffeine intake and how quickly it metabolizes before nightfall matter. Limiting caffeine, not just avoiding it late, may help protect sleep quality.

via Gizmodo|

#caffeine #deep-sleep #eeg

space2 months ago•12 min saved

Ann Druyan’s Brainwaves Echo Across the Cosmos on Voyager’s Golden Record

The Voyager Golden Record includes an hour-long recording of Ann Druyan’s brainwaves and heartbeat, compressed into a one-minute track created in 1977 to guide thoughts about Earth’s history, civilization, and her love for Carl Sagan. Druyan intended it as a private meditation that could hint at inner life to any future listener, perhaps alien; today, neuroscience would say such thoughts are unreadable without the full context. The piece frames a hopeful, human, interior moment encoded for interstellar travel as Voyager 1 and 2 sail onward through interstellar space.

via Space Daily|

#ann-druyan #brainwaves #eeg

science3 months ago•13 min saved

Dying Brain’s Gamma Burst: Real Signal, Unclear Meaning

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.

via Space Daily|

#consciousness #dying-brain #eeg

health3 months ago•16 min saved

Anesthesia may trigger sleep-and-coma brain states, Yale study suggests

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.

via Hartford Courant|

#anesthesia #brain #coma

health3 months ago•9 min saved

Brain under anesthesia: a mix of sleep and coma, Yale study finds

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.

via futurity.org|

#anesthesia #brain #coma

science3 months ago•8 min saved

Dreams on Demand: The Brain Flips into Dream Narratives Across Awake and Sleep

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.

via Neuroscience News|

#dream-like-states #eeg #hypnagogia

science4 months ago•6 min saved

Seeing the Sound: Visual Cues Sharpen Hearing in Noise

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.

via The Daily Galaxy|

#eeg #hearing #multisensory-perception