Notice bibliographique
Résumé
Sleep is a precious commodity. Anyone who suffers from insomnia knows how crippling sleep loss is. Richard Stephenson and Vern Lewis from the University of Toronto, Canada, explain that sleep is thought to play a pivotal role in a range of biological processes, including memory formation, but many questions still remain unanswered. For example, we don't even know how much sleep we need. According to Stephenson and Lewis, molluscs – such as the sea hare and great pond snail (Lymnaea stagnalis) – have taught us a great deal about the neural basis of memory formation, but could they teach us about the mechanisms of sleep: especially as it wasn't clear whether they do it. Stephenson and Lewis decided to find out whether snails sleep (p. 747).‘There is no single characteristic that unequivocally defines the sleep state,’ say Stephenson and Lewis, ‘instead several criteria are used collectively.’ Describing how sleeping animals are usually unresponsive, hard to wake and settle in a characteristic position, the duo monitored the behaviour of a tank full of pond snails, cataloguing the molluscs' activities to find out whether they did anything that looked like sleep.Analysing the snails' behaviours, Stephenson and Lewis clearly saw them attached to solid surfaces and inactive for periods of tens of minutes. And the snails looked relaxed like other sleeping species: their shells hung away from the body while attached to the side of the tank, the foot looked symmetrical and relaxed, and their tentacles were only partially extended.Having identified a sleep-like resting state, the duo tested the snails' responses: they tapped the molluscs and stimulated their appetites when active and apparently sleeping. The scientists found that the resting snails were much slower to react than active snails, taking over twice as long to retract into their shells when poked and seven times as long to respond when their appetite was stimulated. All in all, the snails certainly seemed to be sleeping, but was their sleep rhythmic like ours and would it be affected by day length?The team monitored the behaviour of 8 snails over 79 days as they varied the animals' light exposure. Instead of regulating their sleep over a 24 h period, the snails clustered sleep bouts in a pattern that cycled every 2–3 days. Also, they did not seem to suffer ‘sleep rebound’ – when we make up for lost sleep.Despite the differences between mammalian and pond snail resting behaviours, Stephenson and Lewis believe that great pond snails do sleep. They say, ‘We suggest that Lymnaea stagnalis, by virtue of its anatomical simplicity and neurophysiological tractability, may prove useful in the investigation of cellular mechanisms of sleep regulation and sleep function’.
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
Comment cette classification a été obtenuedéplier
Prédiction machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,001 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,001 |
| Communication savante | 0,000 | 0,001 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,005 | 0,001 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule source (Gemma direct ou Codex distillé), pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».