The psychological term for mental activities in which we think, solve problems, and use language is called?

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Cognitive?

The psychological term for mental activities in which we think, solve problems, and use language is called "cognition." This term encompasses various processes such as perception, attention, memory, reasoning, problem-solving, decision-making, and language use.

To find this answer, you can start by identifying the key terms in your question, which are "psychological term," "mental activities," "think," "solve problems," and "use language." After understanding the main concepts, you can search for relevant keywords such as "psychological term for mental activities involving thinking, problem-solving, and language use." This would lead you to information about cognition.