Centre for Lusophone and European Literatures and Cultures Portugal, being home for more than 500 researchers, and the research unit with more young researchers in projects and positions of responsibility. Due to its established protocols, CLEPUL is part of an institutional network of cooperation for research in several areas of literary science and history of culture, including Portuguese institutions in Lisbon, Porto, Algarve and the Atlantic Islands, namely Madeira, and international institutions, such as in Australia and Canada, while keeping privileged relations with Lusophone countries, namely Brazil, Angola, Mozambique, Cape Verde, São Tomé and Príncipe and Guinea-Bissau. CLEPUL currently publishes six periodicals, to disseminate its scientific research results:
Spoken language is an innate human capability, and written language is a cultural invention. However some linguists, such as those of the Prague school, argue that written and spoken language possess distinct qualities which would argue against written language being dependent on spoken language for its existence. Both vocal and sign languages are composed of words. In vocal languages, words are made up from a limited set of vowels and consonants, and often tone. In sign languages, words are made up from a limited set of shapes, orientations, locations movements of the hands, and often facial expressions; in both cases, the building