These sites deal with semeiognomy in one form or another. The descriptions are quoted from the sites themselves... who better to provide them?
“The American Speech-Language-Hearing Association (ASHA) is the national professional, scientific, and credentialing association for 218,000 members and affiliates who are audiologists; speech-language pathologists; speech, language, and hearing scientists; audiology and speech-language pathology support personnel; and students.”
This site features the research of Dr. Elaine Aron. There is a related Wikipedia article.
“We advance global awareness of the neurological phenomena of synaesthesia through our support for academic, creative, and community inquiry into cross-modal perception. IASAS cultivates global collaboration among synaesthetes, artists, scientists, and persons interested in synaesthesia. Through public lectures, creative exhibits, online communities, and educational outreach, The International Association of Synaesthetes, Artists, and Scientists serves the public good through fostering interest, understanding, and acceptance of synaesthesia as an expression of human neurodiversity.”
"The International Cognitive Linguistics Association (ICLA) offers a forum for research within the perspective of cognitive linguistics. This perspective subsumes a number of concerns and broadly compatible theoretical approaches that share a common basis: the idea that language is an integral part of cognition which reflects the interaction of cultural, psychological, communicative, and functional considerations, and which can only be understood in the context of a realistic view of conceptualization and mental processing."
“Biosemiotics studies the signs of life and the life of signs (in the words of Jesper Hoffmeyer).”
“What became apparent as I was making my selections after each shoot was that I was attracted to the images where the subjects appeared almost human, expressing emotions and using gestures I thought were reserved only for people.”
“Advice and stories for introverts and extroverts alike on how to appreciate our quiet sides. Featuring essays, videos, interviews, and more.”
Mission: To impact quality of life by developing and promoting best practices for sensory health and wellness through treatment, education, and research.”