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文章數：110 |
 一頭牛日式燒肉假日會大排長龍嗎？》公益路最值得吃的10家餐廳｜實訪整理 |
| 創作｜散文 2026/05/20 03:35:04 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
身為一個熱愛美食、喜歡在城市裡挖掘驚喜的人，臺中公益路一直是我最常出沒的地方之一。這條路可說是「臺中人的美食戰場」，從精緻西餐到創意火鍋，從日式丼飯到義式早午餐，每走幾步，就會有完全不同的特色料理餐廳。 這次我特別花了一整個月，實際造訪了公益路上十間口碑不錯的餐廳。有的是網友熱推的打卡名店，也有隱藏在巷弄裡的小驚喜。我以環境氛圍、口味表現、價格CP值與再訪意願為基準，整理出這篇實測評比。希望能幫正在猶豫去哪裡吃飯的你，找到那一間「吃完會想再來」的餐廳。 評比標準與整理方向
這次我走訪的10家餐廳橫跨不同料理類型，從高質感牛排館到巷弄系早午餐，每一間都有自己獨特的風格。為了讓整體比較更客觀，我依照以下四大面向進行評比，並搭配實際用餐體驗來打分。
整體而言，我希望這份評比不只是「哪家好吃」，而是幫你在不同情境下（約會、家庭聚餐、朋友小聚、商業午餐）都能快速找到合適的選擇。畢竟，美食不只是味覺的滿足，更是一段段與朋友共享的生活記憶。 10間臺中公益路餐廳評比懶人包公益路向來是臺中人聚餐的首選地段，從火鍋、燒肉到中式料理與早午餐，每走幾步就有驚喜。以下是我實際造訪過的10間代表性餐廳清單，橫跨平價、創意、高級各路風格。
一頭牛日式燒肉｜炭香濃郁的和牛饗宴，約會聚餐首選
走在公益路上，很難不被 一頭牛日式燒肉 的木質外觀吸引。低調卻不失質感的門面，搭配昏黃燈光與暖色調的內裝，讓人一進門就感受到濃濃的日式職人氛圍。店內空間不大，但桌距規劃得宜，每桌皆設有獨立排煙設備，烤肉時完全不怕滿身油煙味。 餐點特色
一頭牛的靈魂，絕對是他們招牌的「三國和牛拼盤」。 用餐體驗整體節奏掌握得非常好。店員會在你剛想烤下一片肉時貼心遞上夾子、幫忙換烤網，讓人完全不用分心。整場用餐過程就像一場表演，從視覺、嗅覺到味覺都被滿足。 綜合評分
地址：408臺中市南屯區公益路二段162號電話：04-23206800 小結語一頭牛日式燒肉不僅是「吃肉的地方」，更像是一場五感盛宴。從進門那一刻到最後一道甜點，都能感受到他們對細節的用心。 TANG Zhan 湯棧｜文青系火鍋代表，麻香湯底與視覺美感並重
在公益路這條美食戰線上，TANG Zhan 湯棧 是讓人一眼就會想走進去的那一種。 餐點特色
湯棧最有名的當然是它的「麻香鍋」。 用餐體驗整體氛圍比一般火鍋店更有質感。 綜合評分
地址：408臺中市南屯區公益路二段248號電話：04-22580617 官網：https://www.facebook.com/TangZhan.tw/ 小結語TANG Zhan 湯棧 把傳統火鍋做出新的樣貌保留臺式鍋物的溫度，又結合現代風格與細節服務，讓吃鍋這件事變得更有品味。 如果你想找一間兼具「好吃、好拍、好放鬆」的火鍋店，湯棧會是公益路上最有風格的選擇之一。 NINI 尼尼臺中店｜明亮寬敞的義式早午餐天堂
如果說前兩間是肉食愛好者的天堂，那 NINI 尼尼臺中店 絕對是想放鬆、聊聊天的好地方。餐廳外觀以白色系與大片玻璃窗為主，陽光灑進室內，讓人一踏入就有種度假般的輕盈感。假日早午餐時段特別熱鬧，建議提早訂位。 餐點特色
NINI 的菜單融合義式與臺灣人口味，選擇多樣且份量十足。主打的 松露燉飯 濃郁卻不膩口，米芯保留微Q口感；而 香蒜海鮮義大利麵 則以新鮮白蝦、花枝與淡菜搭配微辣蒜香，口感層次豐富。 用餐體驗店內氣氛輕鬆不拘謹，無論是一個人帶電腦工作、或朋友聚餐，都能找到舒服角落。餐點上桌速度穩定，服務人員態度親切、補水與收盤都非常主動。整體節奏讓人覺得「時間變慢了」，很適合想遠離忙碌日常的人。 綜合評分
地址：40861臺中市南屯區公益路二段18號電話：04-23288498 小結語NINI 尼尼臺中店是一間能讓人放下手機、慢慢吃飯的餐廳。餐點不追求浮誇，而是以「剛剛好」的份量與風味，陪伴每個平凡午後。如果你在找一間能邊吃邊聊天、拍照也漂亮的早午餐店，NINI 會是你在公益路上最不費力的幸福選擇。 加分100%浜中特選昆布鍋物｜平價卻用心的湯頭系火鍋，家庭聚餐好選擇
在公益路這條高質感餐廳林立的戰場上，加分100%浜中特選昆布鍋物 走的是截然不同的路線。它沒有浮誇的裝潢、也沒有高價位的套餐，但靠著實在的湯頭與親切的服務，默默吸引許多回頭客。每到用餐時間，總能看到家庭或情侶三兩成群地圍著鍋邊聊天。 餐點特色
主打 北海道浜中昆布湯底，湯頭清澈卻不單薄，越煮越能喝出海藻與柴魚的自然香氣。 用餐體驗整體氛圍偏家庭取向，桌距寬敞、座位舒適，帶小孩來也不覺擁擠。店員態度親切，補湯、收盤都很勤快，給人一種「被照顧著」的安心感。 綜合評分
地址：403臺中市西區公益路288號電話：0910855180 小結語加分100%浜中特選昆布鍋物是一間「不浮誇、但會讓人想再訪」的火鍋店。它不追求豪華擺盤，而是用最簡單的湯頭與新鮮食材，傳遞出家常卻不平凡的溫度。 印月餐廳｜中式料理的藝術演繹，宴客與家庭聚會首選
說到臺中公益路的中式料理代表，印月餐廳 絕對是榜上有名。這間開業多年的餐廳以「中菜西吃」的概念聞名，把傳統中式料理以現代手法重新詮釋。從建築外觀到餐具擺設，每個細節都散發著低調的典雅氣息。 餐點特色
印月最令人印象深刻的是他們將傳統中菜融入創意手法。 用餐體驗服務方面完全對得起餐廳的高級定位。從入座、點餐到上菜節奏，都拿捏得恰如其分。每道菜都會有服務人員細心介紹食材與吃法，讓人感受到「被款待」的尊榮感。 綜合評分
地址：408臺中市南屯區公益路二段818號電話：0422511155 小結語印月餐廳是一間「不只吃飯，更像品味生活」的地方。 KoDō 和牛燒肉｜極致職人精神，專為儀式感與頂級味覺而生
若要形容 KoDō 和牛燒肉 的用餐體驗，一句話足以總結——「像在欣賞一場關於肉的表演」。 餐點特色
這裡主打 日本A5和牛冷藏肉，以「精切厚燒」的方式呈現。 用餐體驗KoDō 的最大特色是「儀式感」。 綜合評分
地址：403臺中市西區公益路260號電話：0423220312 官網：https://www.facebook.com/kodo2018/ 小結語KoDō 和牛燒肉不是日常餐廳，而是一場體驗。 永心鳳茶｜在茶香裡用餐的優雅時光，臺味早午餐的新詮釋
走進 永心鳳茶公益店，彷彿進入一間有氣質的茶館。 餐點特色
永心鳳茶的餐點結合中式靈魂與西式擺盤，無論是「炸雞腿飯」還是「紅玉紅茶拿鐵」，都能讓人感受到熟悉卻不平凡的味道。 用餐體驗店內服務人員態度溫和，對茶品介紹詳盡。上餐節奏剛好，不急不徐。 綜合評分
地址：40360臺中市西區公益路68號三樓(勤美誠品)電話：0423221118 小結語永心鳳茶讓人重新定義「臺味」。 三希樓｜老饕級江浙功夫菜，穩重又帶人情味的中式饗宴
位於公益路上的 三希樓 是許多臺中老饕的口袋名單。 餐點特色
三希樓的菜色以 江浙與港式料理 為主，兼顧傳統與現代風味。 用餐體驗三希樓的服務給人一種老派但貼心的感覺。 綜合評分
地址：408臺中市南屯區公益路二段95號電話：0423202322 官網：https://www.sanxilou.com.tw/ 小結語三希樓是一間「吃得出功夫」的餐廳。 一笈壽司｜低調奢華的無菜單日料，職人手藝詮釋旬味極致
在熱鬧的公益路上，一笈壽司 低調得幾乎不顯眼。 餐點特色
一笈壽司採 Omakase（無菜單料理） 形式，每一餐都由主廚根據當日食材設計。 用餐體驗整場用餐約90分鐘，節奏緩慢但沉穩。 綜合評分
地址：408臺中市南屯區公益路二段25號電話：0423206368 官網：https://www.facebook.com/YIJI.sushi/ 小結語一笈壽司是一間真正讓人「放慢呼吸」的餐廳。 茶六燒肉堂｜人氣爆棚的和牛燒肉聖地，肉香與幸福感同時滿分
若要票選公益路上「最難訂位」的餐廳，茶六燒肉堂 絕對名列前茅。 餐點特色
茶六主打 和牛燒肉套餐，價格約落在 $700–$1000 間，份量與品質兼具。 用餐體驗茶六的服務效率相當高。店員親切、換網勤快、補水速度快，整場用餐流程流暢無壓力。 綜合評分
地址：403臺中市西區公益路268號電話：0423281167 官網：https://inline.app/booking/-L93VSXuz8o86ahWDRg0:inline-live-karuizawa/-LUYUEIOYwa7GCUpAFWA 小結語茶六燒肉堂用「穩定品質＋輕奢氛圍」抓住了臺中年輕族群的心。 吃完10家公益路餐廳後的心得與結語吃完這十家餐廳後，臺中公益路不只是一條美食街，而是一段生活風景線。 有的餐廳講究細膩與儀式感，像 一頭牛日式燒肉 與 一笈壽司，讓人感受到食材最純粹的美好 有的則以親切與溫度打動人心，像 加分昆布鍋物、永心鳳茶，讓人明白吃飯不只是為了飽足，而是一種被照顧的幸福。 而像茶六燒肉堂、TANG Zhan 湯棧 這類人氣名店，則用穩定的品質與熱絡的氛圍，成為許多臺中人心中「想吃肉就去那裡」的代名詞。 這十家店，構成了公益路最動人的縮影 有華麗的，也有溫柔的；有傳統的，也有創新的。 每一家都在自己的風格裡發光，讓人吃到的不只是料理，而是一種生活的溫度與節奏。 對我而言，這不僅是一場美食旅程，更是一趟關於「臺中味道」的回憶之旅。 FAQ：關於臺中公益路美食常見問題Q1：公益路哪一區的餐廳最集中？ Q2：需要提前訂位嗎？ 最後的話若要用一句話形容這趟美食之旅，我會說： TANG Zhan 湯棧用餐時間會不會太短？ 如果你也和我一樣喜歡用味蕾探索一座城市，那就把這篇公益路美食攻略收藏起來吧。一頭牛日式燒肉再訪意願高嗎？ 無論是約會、慶生、家庭聚餐，或只是想犒賞一下辛苦的自己——這條路上永遠會有一間剛剛好的餐廳在等你。茶六燒肉堂值得推薦嗎？ 下一餐，不妨從這10家開始。TANG Zhan 湯棧調味偏重嗎？ 打開手機、約上朋友，讓公益路成為你生活裡最容易抵達的小確幸。一頭牛日式燒肉商務聚餐適合嗎？ 如果你有私心愛店，也歡迎留言分享，TANG Zhan 湯棧長官聚餐合適嗎？ 你的推薦，可能讓我下一趟美食旅程變得更精彩。一頭牛日式燒肉有生日驚喜或畫盤嗎？ A new study from the University of Surrey reveals that the human body can predict the timing of regular meals, and daily blood glucose rhythms may be influenced by both meal timing and size. The research suggests that there is a physiological drive for people to eat at certain times as their bodies have been trained to expect food. Circadian rhythms enable the body to predict meal times, aligning glucose levels and hunger cues with regular feeding schedules. According to a recent study from the University of Surrey, the human body has the ability to predict the timing of regular meals. The findings of the research team suggest that the daily rhythms of blood glucose levels may be influenced not only by the timing of meals but also by their portion sizes. A team of researchers at Surrey, led by Professor Jonathan Johnston, conducted a pioneering investigation to determine if the human circadian system is capable of anticipating large meals. Circadian rhythms, which refer to physiological changes that occur in a 24-hour cycle and are typically synchronized with environmental cues like light and darkness, encompass a variety of metabolic changes. Previous studies in this field have focussed on animal controls and until now it has been undetermined whether human physiology can predict mealtimes and food availability. Jonathan Johnston, Professor of Chronobiology, and Integrative Physiology at the University of Surrey said: “We often get hungry around the same time every day, but the extent to which our biology can anticipate mealtimes is unknown. It is possible that metabolic rhythms align to meal patterns and that regularity of meals will ensure that we eat at the time when our bodies are best adapted to deal with them.” To learn more, 24 male participants undertook an eight-day laboratory study with strict sleep-wake schedules, exposure to light-dark cycles, and food intake. For six days, 12 participants consumed small meals hourly throughout the waking period, with the remaining participants consuming two large daily meals (7.5 and 14.5 hours after waking). After six days, all participants were then put on the same feeding schedule for 37 hours and received small meals hourly in a procedure known to reveal internal circadian rhythms. Glucose was measured every 15 minutes during the study, and hunger levels were measured hourly during waking hours on days two four and six in the first stage of the study and then hourly for the final 37 hours. Analyzing results of the first six days of the study, researchers found the glucose concentration of participants in the small meal group increased upon waking and remained elevated throughout the day until declining after their last meal. In the large meal group, there was a similar increase in glucose concentration upon waking however there was a gradual decline leading up to the first meal. Glucose and Hunger Responses to Meal Patterns In the final 37 hours, when both groups were fed the same small meals hourly, all participants exhibited an initial rise in glucose concentration upon waking. However, in those who had previously received two large meals, glucose levels began to decline before the anticipated large meal (which they did not receive) whereas for participants who had always consumed small meals hourly, their glucose levels continued to rise as previously seen. In addition, in the large meal group, there was an increase in hunger preceding projected mealtimes which sharply declined after the anticipated mealtime had passed. Professor Johnston added: “What we have found is that the human body is rhythmically programmed to anticipate mealtimes particularly when food is not readily accessible. This suggests that there is a physiological drive for some people to eat at certain times as their body has been trained to expect food rather than it just being a psychological habit.” Reference: “Human glucose rhythms and subjective hunger anticipate meal timing” by Cheryl M. Isherwood, Daan R. van der Veen, Hana Hassanin, Debra J. Skene and Jonathan D. Johnston, 22 February 2023, Current Biology. DOI: 10.1016/j.cub.2023.02.005 Oculudentavis naga, as depicted in this artist’s reconstruction, was a bizarre lizard that researchers initially struggled to categorize. They are still unsure of its exact position in the lizard family tree. Credit: Stephanie Abramowicz/Peretti Museum Foundation/Current Biology An international research team has described a new species of Oculudentavis, providing further evidence that the animal first identified as a hummingbird-sized dinosaur was actually a lizard. The new species, named Oculudentavis naga in honor of the Naga people of Myanmar and India, is represented by a partial skeleton that includes a complete skull, exquisitely preserved in amber with visible scales and soft tissue. The specimen is in the same genus as Oculudentavis khaungraae, whose original description as the smallest known bird was retracted last year. The two fossils were found in the same area and are about 99 million years old. Researchers published their findings in Current Biology today (June 14, 2021). The team, led by Arnau Bolet of Barcelona’s Institut Català de Paleontologia Miquel Crusafont, used CT scans to separate, analyze and compare each bone in the two species digitally, uncovering a number of physical characteristics that earmark the small animals as lizards. Oculudentavis is so strange, however, it was difficult to categorize without close examination of its features, Bolet said. “The specimen puzzled all of us at first because if it was a lizard, it was a highly unusual one,” he said in an institutional press release. Bolet and fellow lizard experts from around the world first noted the specimen while studying a collection of amber fossils acquired from Myanmar by gemologist Adolf Peretti. (Note: The mining and sale of Burmese amber are often entangled with human rights abuses. Peretti purchased the fossil legally prior to the conflict in 2017. More details appear in an ethics statement at the end of this story). Oculudentavis naga, top, is in the same genus as Oculudentavis khaungraae, bottom, a specimen whose controversial identification as an early bird was retracted last year. Both specimens’ skulls deformed during preservation, emphasizing lizardlike features in one and birdlike features in the other. Credit: Edward Stanley of the Florida Museum of Natural History/Peretti Museum Foundation/Current Biology Herpetologist Juan Diego Daza examined the small, unusual skull, preserved with a short portion of the spine and shoulder bones. He, too, was confused by its odd array of features: Could it be some kind of pterodactyl or possibly an ancient relative of monitor lizards? “From the moment we uploaded the first CT scan, everyone was brainstorming what it could be,” said Daza, assistant professor of biological sciences at Sam Houston State University. “In the end, a closer look and our analyses help us clarify its position.” Major clues that the mystery animal was a lizard included the presence of scales; teeth attached directly to its jawbone, rather than nestled in sockets, as dinosaur teeth were; lizard-like eye structures and shoulder bones; and a hockey stick-shaped skull bone that is universally shared among scaled reptiles, also known as squamates. The team also determined both species’ skulls had deformed during preservation. Oculudentavis khaungraae’s snout was squeezed into a narrower, more beaklike profile while O. naga’s braincase — the part of the skull that encloses the brain — was compressed. The distortions highlighted birdlike features in one skull and lizard-like features in the other, said study co-author Edward Stanley, director of the Florida Museum of Natural History’s Digital Discovery and Dissemination Laboratory. Amber can exquisitely preserve small forest animals that would have otherwise decomposed. CT scans of this fossilized Oculudentavis naga showcase the specimen’s scales, skin and soft tissue. Credit: Adolf Peretti/Peretti Museum Foundation/Current Biology “Imagine taking a lizard and pinching its nose into a triangular shape,” Stanley said. “It would look a lot more like a bird.” Oculudentavis’ birdlike skull proportions, however, do not indicate that it was related to birds, said study co-author Susan Evans, professor of vertebrate morphology and paleontology at University College London. “Despite presenting a vaulted cranium and a long and tapering snout, it does not present meaningful physical characters that can be used to sustain a close relationship to birds, and all of its features indicate that it is a lizard,” she said. While the two species’ skulls do not closely resemble one another at first glance, their shared characteristics became clearer as the researchers digitally isolated each bone and compared them with each other. The differences were minimized when the original shape of both fossils was reconstructed through a painstaking process known as retrodeformation, conducted by Marta Vidal-García from the University of Calgary in Canada. “We concluded that both specimens are similar enough to belong to the same genus, Oculudentavis, but a number of differences suggest that they represent separate species,” Bolet said. In the better-preserved O. naga specimen, the team was also able to identify a raised crest running down the top of the snout and a flap of loose skin under the chin that may have been inflated in display, Evans said. However, the researchers came up short in their attempts to find Oculudentavis’ exact position in the lizard family tree. “It’s a really weird animal. It’s unlike any other lizard we have today,” Daza said. “We think it represents a group of squamates we were not aware of.” The Cretaceous Period, 145.5 to 66 million years ago, gave rise to many lizard and snake groups on the planet today, but tracing fossils from this era to their closest living relatives can be difficult, Daza said. “We estimate that many lizards originated during this time, but they still hadn’t evolved their modern appearance,” he said. “That’s why they can trick us. They may have characteristics of this group or that one, but in reality, they don’t match perfectly.” The majority of the study was conducted with CT data created at the Australian Centre for Neutron Scattering and the High-Resolution X-ray Computed Tomography Facility at the University of Texas at Austin. O. naga is now available digitally to anyone with Internet access, which allows the team’s findings to be reassessed and opens up the possibility of new discoveries, Stanley said. “With paleontology, you often have one specimen of a species to work with, which makes that individual very important. Researchers can therefore be quite protective of it, but our mindset is ‘Let’s put it out there,'” Stanley said. “The important thing is that the research gets done, not necessarily that we do the research. We feel that’s the way it should be.” While Myanmar’s amber deposits are a treasure trove of fossil lizards found nowhere else in the world, Daza said the consensus among paleontologists is that acquiring Burmese amber ethically has become increasingly difficult, especially after the military seized control in February. “As scientists we feel it is our job to unveil these priceless traces of life, so the whole world can know more about the past. But we have to be extremely careful that during the process, we don’t benefit a group of people committing crimes against humanity,” he said. “In the end, the credit should go to the miners who risk their lives to recover these amazing amber fossils.” Other study co-authors are J. Salvador Arias of Argentina’s National Scientific and Technical Research Council (CONICET – Miguel Lillo Foundation); Andrej Cernansky of Comenius University in Bratislava, Slovakia; Aaron Bauer of Villanova University; Joseph Bevitt of the Australian Nuclear Science and Technology Organisation; and Adolf Peretti of the Peretti Museum Foundation in Switzerland. A 3D digitized specimen of O. naga is available online via MorphoSource. The O. naga fossil is housed at the Peretti Museum Foundation in Switzerland, and the O. khaungraae specimen is at the Hupoge Amber Museum in China. The specimen was acquired following the ethical guidelines for the use of Burmese amber set forth by the Society for Vertebrate Paleontology. The specimen was purchased from authorized companies that are independent from military groups. These companies export amber pieces legally from Myanmar, following an ethical code that ensures no violations of human rights were committed during mining and commercialization and that money derived from sales did not support armed conflict. The fossil has an authenticated paper trail, including export permits from Myanmar. All documentation is available from the Peretti Museum Foundation upon request. Reference: “Unusual morphology in the mid-Cretaceous lizard Oculudentavis” by Arnau Bolet, Edward L. Stanley, Juan D. Daza, J. Salvador Arias, Andrej Čerňanský, Marta Vidal-García, Aaron M. Bauer, Joseph J. Bevitt, Adolf Peretti and Susan E. Evans, 14 June 2021, Current Biology. DOI: 10.1016/j.cub.2021.05.040 Funding: National Science Foundation, Sam Houston State University, Royal Society, Spanish Ministry of Science, Innovation and Universities, CERCA Programme/Generalitat de Catalunya, Ministry of Education of the Slovak Republic and the Slovak Academy of Science A study reveals that both sensory and motor signals are processed in the cortex, challenging previous understandings and indicating that these signals are intertwined in influencing decisions. Credit: SciTechDaily.com Groundbreaking research shows how the brain integrates sensory information and movement signals, influencing how we react to what we hear. You hear a phone ring or a dog bark. Is it yours or someone else’s? You hear footsteps in the night — is it your child, or an intruder? Friend or foe? The decision you make will determine what action you take next. Researchers at the Champalimaud Foundation have shed light on what might be going on in our brains during moments like these, and take us a step closer to unraveling the mystery of how the brain translates perceptions into actions. Understanding Brain Processes During Decision-Making Every day, we make countless decisions based on sounds without a second thought. But what exactly happens in the brain during such instances? A new study from the Renart Lab, published today (May 10) in Current Biology, takes a look under the hood. Their findings deepen our understanding of how sensory information and behavioral choices are intertwined within the cortex — the brain’s outer layer that shapes our conscious perception of the world. The cortex is divided into regions that handle different functions: sensory areas process information from our environment, while motor areas manage our actions. Surprisingly, signals related to future actions, which one might expect to find only in motor areas, also appear in sensory ones. What are movement-related signals doing in regions dedicated to sensory processing? When and where do these signals emerge? Exploring these questions could clarify the origin and role of these perplexing signals, and how they do — or don’t — drive decisions. Innovative Research Methods The researchers tackled these queries by devising a task for mice. Postdoc Raphael Steinfeld, the study’s lead author, picks up the story: “To unravel what signals related to future actions might be doing in sensory areas, we thought carefully about the task mice would have to perform. Previous studies often relied on “Go-NoGo” tasks, where animals report their choice by either making an action, or not moving, depending on the identity of the stimulus. This setup, however, mixes up signals linked to specific movements with those related to just moving in general. To isolate signals for specific actions, we trained mice to decide between one of two actions. They had to decide if a sound was high or low compared to a set threshold and report their decision by licking one of two spouts, left or right.” However, this wasn’t sufficient. “Mice quickly learn this task, often responding as soon as they hear the sound,” Steinfeld continues. “To separate brain activity related to the sound from that related to the response, we introduced a critical half-second delay. During this interval, the mice had to withhold their decision. Crucially, this delay allowed us to temporally separate brain activity linked to the stimulus from that linked to the choice, and track how movement-related neural signals unfolded over time from the initial sensory input.” “To dissect neural representations of stimulus and choice, it was also important to design an experiment challenging enough to allow the mice to make mistakes. A 100% success rate would blur the distinction between stimulus and choice, as each stimulus would always elicit the same response. By creating the potential for errors, we could tease apart the neural encoding of the sound from the decisions made.” For instance, in cases where the mice heard the same tone but made different decisions (correct or incorrect), they could examine whether a neuron’s activity varied between the two actions. If so, it would indicate that the neuron encoded information about the choice. Deepening Understanding of Neural Connections After six months of rigorous training, the researchers could finally begin recording neural activity in mice as they performed the task. They focused on the auditory cortex, the part of the cortex responsible for processing what we hear, which they had already shown was required for the task. “The cortex of mice and humans is composed of six layers, each with specialized functions and distinct connections to other brain regions,” explains Alfonso Renart, principal investigator and the study’s senior author. “Given that certain layers typically receive sensory information from brain regions, while others send input to motor centers, we simultaneously recorded activity across the layers of the auditory cortex—for the first time in a task like ours, in which sensory and motor signals could be cleanly separated.” “We found that sensory- and choice-related signals displayed distinct spatial and temporal patterns,” Renart continues. “Signals related to sound detection appeared quickly but faded fast, vanishing around 400 milliseconds after the sound was presented, and were distributed broadly across all cortical layers. In contrast, choice-related signals, which indicate the movement the mouse is about to make, emerged later, before the decision was executed, and were concentrated in the cortex’s deeper layers.” However, despite the temporal separation between stimulus and choice activity, further analysis revealed an intriguing connection: neurons that responded to a specific sound frequency also tended to be more active for the actions associated with those sounds. As Steinfeld explains, “For instance, a neuron that reacts to high frequencies might activate more for a rightward lick in one mouse and a leftward lick in another, depending on how each was trained, since we switched the sound-action contingency. This variability across different animals shows that the activity isn’t hardwired but adapts through experience. These neurons learn to increase their activity for whatever action is appropriate based on their preferred sound frequency.” Origin and Role of Choice Signals So, what might the origin of these choice signals in the auditory cortex be? “Interestingly,” notes Renart, “the early sensory signals in the auditory cortex don’t seem to predict the mice’s eventual choice, and the choice signals emerge significantly later. This suggests that the sensory signals in the auditory cortex don’t directly cause the mice’s actions, and that the choice signals we observe are likely computed elsewhere in higher brain regions involved in planning or executing movements, which then send their feedback to the auditory cortex.” But if these movement signals don’t dictate actions, what role could they play? Perhaps they serve mainly to integrate and relay information. For instance, these signals could adjust the brain’s perception to align with an unfolding decision, enhancing the stability of what we perceive. Alternatively, they could prime the brain for the expected sensory outcomes of actions, like the noise made by moving, ensuring our sensory experiences match our movements. Future Research and Implications Yet, these hypotheses remain to be verified. “One might wonder, if the sensory signals of the auditory cortex don’t directly inform choices, and the choice signals we observe there aren’t actually produced by it, then what exactly is the purpose of the auditory cortex?” Renart muses. “We could speculate that the auditory cortex is more concerned with constructing a conscious experience of sound than with sensory-motor transformation, but that’s a story for another day.” Still, a causal role cannot be ruled out, particularly since the deeper layers of the auditory cortex transmit information to the posterior striatum, part of the brain’s control center for habits and movements. Future studies will aim to pinpoint the precise origins of these movement signals and whether they are indeed causal to behavior. For now, we can add another piece to the puzzle of how brains convert perception to action, and the internal mechanisms at work when you next hear footsteps in the night. Reference: “Differential representation of sensory information and behavioral choice across layers of the mouse auditory cortex” by Raphael Steinfeld, André Tacão-Monteiro and Alfonso Renart, 10 May 2024, Current Biology. DOI: 10.1016/j.cub.2024.04.040 RRG455KLJIEVEWWF |
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