Short answers, pulled from the story.
Thought is a cognitive process that occurs independently of any sensory input, allowing individuals to entertain ideas and make judgments without external stimulation. This internal dialogue defines the nature of being human by creating mental states that exist without physical presence.
Plato proposed that thinking is a spiritual activity where the mind perceives eternal forms existing in a changeless, non-physical realm. He addressed the challenge of accessing these forms through his theory of recollection, which claims the soul remembers them from a prior existence before birth.
The language of thought hypothesis posits that thinking occurs in a mental language called Mentalese, which is composed of words connected in syntactic ways to form sentences. This hypothesis suggests that thought is composed of atomic representational constituents that can be combined to generate an infinite number of unique representations.
Conscious thought is the paradigmatic form of thinking experienced directly, while unconscious thought happens without conscious awareness and is inferred by the sudden appearance of solutions. Unconscious thought theorists argue that unconscious thought excels at complex problems with many variables, whereas conscious thought is limited to simple problems with few variables.
The mind-body problem concerns the explanation of the relationship between mental processes and bodily states, asking how conscious experiences arise from electrochemical properties of the brain. Philosophers from at least the time of René Descartes have struggled to explain how propositional attitudes cause neurons to fire and muscles to contract.
Critical thinking is a reasonable and reflective form of thinking that determines what to believe or how to act by assessing the soundness of reasoning and the reliability of evidence. Positive thinking involves focusing attention on positive aspects of a situation to withdraw attention from negative sides, which may lead to better handling of stress but can also result in unrealistic fantasies.