idw – Informationsdienst Wissenschaft

Nachrichten, Termine, Experten

Grafik: idw-Logo
Grafik: idw-Logo

idw - Informationsdienst
Wissenschaft

Science Video Project
idw-Abo

idw-News App:

AppStore

Google Play Store



Instanz:
Teilen: 
14.02.2019 13:59

Similarities and differences between avian and mammalian sleep and possibly memory consolidation

Dr. Sabine Spehn Presse- und Öffentlichkeitsarbeit
Max-Planck-Institut für Ornithologie

    Birds have good memories, but in contrast to mammals, little is known about how they consolidate memories during sleep. Researchers from the Max Planck Institute for Ornithology and Utrecht University recorded waves of slow activity traveling through the brain of sleeping pigeons that are very similar to those observed in mammals. However, they could not detect other brain rhythms known to be important for certain types of memory consolidation in mammals. They therefore suggest that birds may process some memories in a different manner from mammals.

    Sleep in birds and mammals is very similar with two distinct sleep phases. During rapid eye movement (REM) sleep the eyes twitch, the muscles relax and the brain is active, but the animal is less responsive to its surroundings. The other sleep state is slow-wave sleep, also known as non-REM sleep. In mammals, this is the state where long-term memory formation is thought to happen, when a combination of three brain rhythms in the hippocampus and neocortex work together to gradually transfer short-term memory from the hippocampus to the neocortex for long-term storage. The three brain rhythms involved are neocortical slow-waves, thalamocortical spindles, and the so-called hippocampal sharp-wave ripples. “In birds, only slow-waves have been detected in electroencephalogram (EEG) recordings from the surface of the brain”, says Jacqueline van der Meij, first author of the study. “Given that birds are well known for their long-term memory, we wondered whether spindles were lurking undetected deeper in their brains.” The researchers measured brain activity across the layers of the hyperpallium – the avian version of the neocortex – in naturally sleeping pigeons.

    As in the surface EEGs from various birds, only slow-waves were detected deeper in the brain during NREM sleep in pigeons. Interestingly, as in the mammalian neocortex, slow-waves appeared first in specific parts of the hyperpallium and spread out as travelling waves of activity [SEE VIDEO]. However, spindles were not detected. “The absence of spindles might be linked to differences between how mammals and birds store hippocampal memories” says Niels Rattenborg, who led the study. “In mammals, memories initially stored in the hippocampus transfer to the neocortex over time. However, as memories are not known to transfer out of the avian hippocampus, birds may have no need for spindles.” Nonetheless, Jacqueline van der Meij notes, “Our findings indicate that traveling slow-waves, a trait shared by mammals and birds, may be involved in more general processes unrelated to transferring hippocampal memories in both groups.”


    Wissenschaftliche Ansprechpartner:

    Jacqueline van der Meij
    Research Group „Avian Sleep“
    Max Planck Institute for Ornithology, Seewiesen
    Email: jvandermeij@orn.mpg.de
    Phone: +49 8157 932-357


    Originalpublikation:

    Jacqueline van der Meij, Dolores Martinez-Gonzalez, Gabriël J.L. Beckers and Niels C. Rattenborg 2019. Intra-“cortical” activity during avian non-REM and REM sleep: variant and invariant traits between birds and mammals. Sleep, Volume 42, Issue 2, published on 1 February 2019 (https://doi.org/10.1093/sleep/zsy230)


    Weitere Informationen:

    Waves in the brain of a sleeping pigeon (Video)
    https://www.orn.mpg.de/4247961/news_publication_12722539 Link to the press information on the institutes webpage


    Bilder

    Sleeping pigeon
    Sleeping pigeon
    Gianina Ungurean
    None


    Merkmale dieser Pressemitteilung:
    Journalisten
    Biologie
    überregional
    Forschungsergebnisse
    Englisch


     

    Hilfe

    Die Suche / Erweiterte Suche im idw-Archiv
    Verknüpfungen

    Sie können Suchbegriffe mit und, oder und / oder nicht verknüpfen, z. B. Philo nicht logie.

    Klammern

    Verknüpfungen können Sie mit Klammern voneinander trennen, z. B. (Philo nicht logie) oder (Psycho und logie).

    Wortgruppen

    Zusammenhängende Worte werden als Wortgruppe gesucht, wenn Sie sie in Anführungsstriche setzen, z. B. „Bundesrepublik Deutschland“.

    Auswahlkriterien

    Die Erweiterte Suche können Sie auch nutzen, ohne Suchbegriffe einzugeben. Sie orientiert sich dann an den Kriterien, die Sie ausgewählt haben (z. B. nach dem Land oder dem Sachgebiet).

    Haben Sie in einer Kategorie kein Kriterium ausgewählt, wird die gesamte Kategorie durchsucht (z.B. alle Sachgebiete oder alle Länder).