Funding for this research was provided by:
Heinrich-Heine-Universität Düsseldorf
Article History
Received: 10 August 2022
Accepted: 26 August 2022
First Online: 26 September 2022
Change Date: 14 November 2022
Change Type: Update
Change Details: Missing Open Access funding information has been added in the Funding Note.
Declarations
:
: As this paper reviews the existing literature on the topic, no ethically relevant experiments were conducted. Images of identifiable persons used in this paper are taken from the ASL Signbank, licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International license. The depicted individuals have given their informed consent to the use of their pictures for the ASL Signbank and publications building on it.
: The authors declare that they have no conflict of interest.
: No data were analyzed for the present paper.