The model of the speech circuit proposed by Ferdinand de Saussure in "Course in General Linguistics" (1966 [1916]). A conversation is an exchange of vocalized mental signs. The drawing uses the oak clipart by rg1024 www.openclipart.org/detail/colored-oak-tree-by-rg1024
The speech circuit acc. to de Saussure free icon was designed by smok for icons Png and presented to its users.
smok
12/15/2017