Counter examples are given to show the noncoincidence of these sets and mappings.
Hakeem A. Othman 2011, 'On Fuzzy Sp-Open Sets', Advances in Fuzzy Systemshttp://dx.doi.org/10.1155/2011/768028. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
It turns out that this index depends on the coincidence/noncoincidence of the leading hemispheres in speech and motor processes.
Kovyazina, M.S., Khokhlov, N.A., Morozova, N.V. 2015, 'The connection of hemispheric activity in the field of audioverbal perception andthe progressive lateralization of speech and motor processes.', Psychology in Russia: State of Arthttp://psychologyinrussia.com/volumes/pdf/2015_4/psychology_2015_4_6.pdf. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)