Cognition is the set of all mental abilities and processes related to knowledge, attention, memory and working memory, judgment and evaluation, reasoning and  computation , problem solving and decision making, comprehension and production of language, etc.
Less common causes. Less commonly, tongue pain may be caused by: a viral infection â such as an infection that causes hand, foot and mouth disease or cold sores. vitamin deficiencies and anaemia â a sore tongue can sometimes be a symptom of iron deficiency anaemia and vitamin B12 or folate deficiency anaemia.
Mouth dryness or thick saliva. Radiation therapy to the head and neck areas, some types of chemo, and certain other medicines can cause dry mouth or thick saliva. The glands that make saliva can become irritated and make less saliva, or your saliva can become very thick and sticky. Dryness can be mild or severe.