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Titel: The vestigial pinna-orienting system in humans briefly suppresses superior auricular muscle activity during reflexive orienting toward auditory stimuli
VerfasserIn: Schroeer, Andreas
Corona-Strauss, Farah I.
Hannemann, Ronny
Hackley, Steven A
Strauss, Daniel J.
Sprache: Englisch
Titel: Journal of Neurophysiology
Bandnummer: 132
Heft: 2
Seiten: 514-526
Verlag/Plattform: American Physiological Society (APS)
Erscheinungsjahr: 2024
Freie Schlagwörter: auditory attention
electromyography
posterior auricular muscle
superior auricular muscle
DDC-Sachgruppe: 570 Biowissenschaften, Biologie
610 Medizin, Gesundheit
Dokumenttyp: Journalartikel / Zeitschriftenartikel
Abstract: The vestigial pinna-orienting system in humans is capable of increasing the activity of several auricular muscles in response to lateralized transient auditory stimuli. For example, transient increases in electromyographic activity in the posterior auricular muscle (PAM) to an attention-capturing stimulus have been documented. For the current study, surface electromyograms (EMGs) were recorded from the PAMs and superior auricular muscles (SAMs) of 10 normal-hearing participants. During the experiments, lateralized transient auditory stimuli, such as a crying baby, a shattering vase, or the participant's first names, were presented. These transient stimuli were either presented in silence or when participants actively listened to a podcast. Although ipsilateral PAM activity increased in response to transient stimuli, the SAM displayed the opposite behavior, i.e., a brief, ipsilateral suppression of activity. This suppression of ipsilateral SAM activity was more frequent on the right (75%) than left side (35%), whereas an ipsilateral PAM increase was roughly equal in prevalence on the two sides (left: 90%, right: 95%). During the active listening task, SAM suppression on the right ear was significantly larger in response to ipsilateral stimuli, compared with contralateral ones (P = 0.002), whereas PAM activity increased significantly (P = 0.002). Overall, this study provides evidence of a systematic transient suppression of the SAM during exogenous attention. This could suggest a more complex system than previously assumed, as the presence of synchronized excitatory and inhibitory components in different auricular muscles points toward a coordinated attempt at reflexively orienting the pinna toward a sound. NEW & NOTEWORTHY This study provides evidence that two auricular muscles in humans, the posterior and superior auricular muscles (PAM, SAM), react fundamentally different to lateralized transient auditory stimuli, especially during active listening. Although the PAM reacts with a transient increase in ipsilateral activity, ongoing ipsilateral SAM activity is briefly suppressed at the same time. This indicates the presence of a more complex and nuanced pinna-orienting system, with synchronized excitatory and inhibitory components in humans, than previously suspected.
DOI der Erstveröffentlichung: 10.1152/jn.00024.2024
URL der Erstveröffentlichung: https://journals.physiology.org/doi/full/10.1152/jn.00024.2024
Link zu diesem Datensatz: urn:nbn:de:bsz:291--ds-437008
hdl:20.500.11880/39268
http://dx.doi.org/10.22028/D291-43700
ISSN: 0022-3077
Datum des Eintrags: 6-Jan-2025
Drittmittel / Förderung: This work was partially funded by the European Union and the state of Saarland (European Regional Development Fund, ERDF), project Center for Digital Neurotechnologies Saar—CDNS.
Fakultät: M - Medizinische Fakultät
Fachrichtung: M - Medizintechnik
M - Radiologie
Professur: M - Keiner Professur zugeordnet
Sammlung:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

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