HN
Hacker News • 36일 전
틱톡·릴스 시청, 뇌 인지통제망 비활성화
IMP 7/10
핵심 요약
저장대학 연구팀이 fMRI와 자기공명분광법(¹H-MRS)으로 56명의 성인을 관찰한 결과, 참가자가 좋아서 끝까지 시청한 숏폼 영상에서만 배측전대상피질(dACC)과 배외측전전두피질(dlPFC)의 활동이 유의미하게 감소했다. 인지통제망 약화는 우울증, ADHD, 중독과 연관되어 있어 알고리즘 기반 숏폼 소비가 자기통제에 미치는 영향을 시사한다. 특정 흥분성 신경전달물질 수치가 높으면 이러한 활동 감소가 줄어드는 것으로 나타났다.
번역된 본문
수백만 명이 매일 숏폼 영상을 연달아 시청한다. 새로운 뇌 스캔 연구에 따르면, 좋아하는 영상을 끝까지 보는 행위 자체가 집중력 유지와 장기적 목표를 고려하는 데 도움을 주는 뇌 영역을 일시적으로 조용하게 만든다.
사람이 마음에 들어 끝까지 보는 숏폼 영상을 시청할 때, 인지통제에 관여하는 두 개의 뇌 영역이 유의미한 비활성화를 보인다. 이것이 2026년 1월 NeuroImage에 발표된 저장대학교의 새로운 연구의 핵심 발견이다. 연구팀은 기능적 자기공명영상(fMRI)과 양성자 자기공명분광법(¹H-MRS)을 함께 사용하여, 56명의 젊은 성인이 MRI 스캐너 안에서 자유롭게 숏폼 영상을 시청하는 동안 이들을 관찰했다. 그 결과 배측전대상피질(dACC)과 배외측전전두피질(dlPFC) 모두에서, 참가자가 마음에 들어 끝까지 시청한 영상을 볼 때 특히 활동이 감소했다.
인지통제는 사람들이 즉각적인 즐거움과 장기적 목표 사이에서 균형을 잡도록 돕는 기능으로, 이 시스템의 손상은 우울증, 불안, ADHD, 중독 같은 질환과 연관되어 있다. 숏폼 플랫폼은 지속적이고 노력이 적은 소비를 위해 설계된, 빠르고 알고리즘으로 선별된 콘텐츠 스트림을 제공한다. 이전 행동연구들은 인터넷 중독과 스마트폰 중독 모두 약화된 자기통제와 관련이 있다고 밝혔으며, 별도의 신경영상 연구들은 행동 중독이 있는 사람들에서 보상 및 인지통제 회로의 이상을 기록해왔다. 그럼에도 불구하고 재미있는 숏폼 영상을 시청하는 행위 자체가 뇌의 인지통제 영역을 억제하는지 직접 검증한 연구는 거의 없었다.
저장대학교 연구팀은 이 질문에 답하고자 했으며, 나아가 이러한 억제가 사람마다 다르게 나타나는 이유를 설명할 수 있는 신경화학적 요인이 무엇인지도 함께 알아보고자 했다.
dACC와 dlPFC는 뇌의 인지통제 네트워크의 핵심을 이룬다. dACC는 갈등 감시, 보상 기반 의사결정, 노력 평가에 기여하며, 스트룹(Stroop) 테스트나 Go/No-Go 테스트 같이 어려운 과제를 수행할 때 일반적으로 활성화된다. dACC와 구조적으로 연결된 dlPFC는 dACC가 통제의 필요성을 감지하면 하향식(top-down) 통제를 수행한다. 동일 연구실의 이전 연구는 이미 (이러한 맥락에서 관련 발견을 제시한 바 있다.)
원문 보기 (영어)
Thursday, August 20, 2026 SAVED POSTS Login Register No Result View All Result HOME HEALTH SCIENCE TRENDING ON HEALTH (TOP) Watching TikTok and Instagram Reels Videos Deactivates the Brain's Cognitive Control Network, Study Finds Study Reveals Microbes in Your Gut and Mouth May Track Psychopathic Traits Oral Potentially Malignant Disorders Precede 80% of Oral Cancers in India, Review Finds Men With Cardiovascular Disease Face Higher Lifetime Cancer Risk Than Women NOW ON AIR (RBC) HEALTH SCIENCE Watching TikTok and Instagram Reels Videos Deactivates the Brain's Cognitive Control Network, Study Finds August 20, 2026 BIOCHEMISTRY New Thiazolidinone Compounds Inhibit SHP-2, an Enzyme Tied to Childhood Leukemia August 20, 2026 CANCER Why Cancer-Fighting Immune Cells Work Fine in Blood but Fail Inside Tumors August 20, 2026 PSYCHOLOGY Scientists Have a Fascinating Hypothesis About Why Smart People Should Spend Less Time With Friends August 15, 2026 NEUROSCIENCE PHYSIOLOGY IMMUNOLOGY CANCER DISCOVERIES SPOTLIGHTS STUDENT PORTAL SCIENCE FEATURED MOLECULAR BIOLOGY GENETICS BIOTECHNOLOGY BIOINFORMATICS BIOCHEMISTRY BIOPHYSICS ZOOLOGY & ECOLOGY ENVIRONMENTAL SCIENCE ECOLOGY EVOLUTION MICRO & PLANT SCIENCE MICROBIOLOGY CELL BIOLOGY DEVELOPMENTAL BIOLOGY PSYCHOLOGY No Result View All Result Home HEALTH SCIENCE Watching TikTok and Instagram Reels Videos Deactivates the Brain's Cognitive Control Network, Study Finds In a Zhejiang University brain-scan study of 56 young adults, both key self-control areas showed clear drops in activity only when participants finished clips they liked. Higher levels of one excitatory brain chemical reduced that drop. by Shibasis Rath August 20, 2026 in HEALTH SCIENCE , NEUROSCIENCE , NEWS Reading Time: 9 mins read 0 A A A A Reset 0 Millions of people finish short video after short video every day; a new brain-scan study shows that the very act of finishing a clip they like temporarily quiets the brain regions that normally help them stay focused and weigh longer-term goals. When people watch a short video they enjoy enough to finish, two brain regions involved in cognitive control show significant deactivation. That is the central finding of a new study from Zhejiang University, published in NeuroImagein January 2026. Using functional MRI alongside proton magnetic resonance spectroscopy (¹H-MRS), the research team examined 56 young adults while they freely watched short video clips inside an MRI scanner. Both the dorsal anterior cingulate cortex (dACC) and the dorsolateral prefrontal cortex (dlPFC) showed reduced activity specifically when participants watched clips they liked enough to view to completion. Cognitive control helps people balance immediate pleasures against longer-term goals, and impairments in this system are linked to conditions such as depression, anxiety, ADHD, and addiction . Short-video platforms present rapid, algorithmically curated streams that are built for continuous, low-effort consumption . Prior behavioral research has tied both internet addiction and smartphone addiction to weaker self-control, and separate neuroimaging work has documented disruptions to reward and cognitive-control circuits in people with behavioral addictions. Despite this, few studies had directly tested whether the act of watching entertaining short videos itself suppresses the brain's cognitive control regions. The Zhejiang University team set out to answer that question, along with a second one: what neurochemical factors might explain why this suppression varies from person to person? The dACC and dlPFC form the core of the brain's cognitive control network. The dACC contributes to conflict monitoring, reward-based decisions, and effort evaluation , and it typically activates during demanding tasks such as the Stroop or Go/No-Go test. The dlPFC, which connects structurally to the dACC, carries out top-down control once the dACC has flagged a need for it. Earlier work from the same lab had already shown that passively viewing personalized short videos suppresses the dACC, regardless of whether the content was algorithmically recommended or generic. Separately, prior neurochemical research has linked resting-state glutamate concentrations in the anterior cingulate cortex to stronger task-related brain activation, while GABA concentrations have been associated with reduced activation in some contexts. However, these metabolite-to-activity relationships have proven inconsistent across different types of cognitive tasks. The team recruited 66 volunteers and excluded 10 for excessive head motion or low-quality spectroscopy data, leaving a final sample of 56 participants (37 men and 19 women, average age 23.3). All participants reported some existing experience with short-video apps. Before scanning, the researchers measured resting-state glutamate and GABA concentrations in each participant's dACC using a MEGA-PRESS spectroscopy sequence, with a matched voxel in the visual cortex serving as a control region. ADVERTISEMENT During the scan, participants watched two six-minute blocks of short clips drawn from a library of 160 videos spanning five categories: single-person actions, multi-person interactions, pets, game scenes, and natural scenery. Average clip length was 23.7 seconds. Participants could press a button at any time to skip to the next clip. Based on viewing behavior, each video was classified as "liked" (watched to the end), "disliked" (skipped before the halfway point), or a third category for clips skipped after the halfway point. On average, participants watched about 19 liked videos and 36 disliked videos per session. The study had been preregistered in September 2024, and the analysis plan set a Bonferroni-corrected significance threshold to account for multiple comparisons. READ ALSO Study Reveals Microbes in Your Gut and Mouth May Track Psychopathic Traits People Who Overuse Pain Pills for Headaches Have More Sleep Problems Both the dACC and dlPFC deactivated significantly below baseline while participants watched liked videos. During disliked videos, the pattern diverged: dACC activity stayed close to baseline, while dlPFC activity remained suppressed, though less severely than during liked viewing. Directly comparing conditions confirmed that both regions showed significantly greater suppression during liked video viewing than during disliked viewing. The visual cortex, used as a control region, activated during both video types with no difference between them, indicating the deactivation pattern was specific to cognitive control regions rather than a general effect of watching video. ADVERTISEMENT Regional Brain Activation During Liked vs. Disliked Video Viewing Bar height is proportional to the t(55) statistic reported in the paper. Bars below the center line indicate significant deactivation; bars above indicate significant activation. ADVERTISEMENT t=-6.30*** liked t=-0.90, n.s. disliked dACC t=-12.20*** liked t=-3.73*** disliked dlPFC t=5.21*** liked t=7.76*** disliked V1 (control) Significant deactivation Significant activation Not significant vs. baseline ***p<.001 Resting-state dACC glutamate concentration also mattered. Independent of GABA, higher dACC glutamate predicted less suppression of dACC activity during both liked and disliked viewing, and less suppression of dlPFC activity during disliked viewing. The link between glutamate and dlPFC activity during liked viewing did not reach statistical significance. GABA concentration, meanwhile, correlated significantly with activation in the visual-cortex control region but showed no significant relationship with dACC or dlPFC activity. Functional connectivity between the dACC and dlPFC increased above baseline during both liked and disliked viewing, and this increase was significantly stronger during liked videos. Connectivity between the dACC and the visual-cortex control region showed no significant deviation from baseline in either condition.