
Cosmic Consciousness: A Study in the Evolution of the Human Mind is a 1901 book by the psychiatrist Richard Maurice Bucke, in which the author explores the concept of cosmic consciousness, which he defines as "a higher form of consciousness than that possessed by the ordinary man".

Fatigue describes a state of tiredness that does not resolve with rest or sleep. In general usage, fatigue is synonymous with extreme tiredness or exhaustion that normally follows prolonged physical or mental activity. When it does not resolve after rest or sleep, or occurs independently of physical or mental exertion it may be a symptom of a medical condition that may become severe or progressive.

In common usage and in philosophy, ideas are the results of thought. Also in philosophy, ideas can also be mental representational images of some object. Many philosophers have considered ideas to be a fundamental ontological category of being. The capacity to create and understand the meaning of ideas is considered to be an essential and defining feature of human beings. In a popular sense, an idea arises in a reflexive, spontaneous manner, even without thinking or serious reflection, for example, when we talk about the idea of a person or a place. A new or an original idea can often lead to innovation.

In the study of the human mind, intellect refers to, describes, and identifies the ability of the human mind to reach correct conclusions about what is true and what is false in reality; and how to solve problems. Derived from the Ancient Greek philosophy term nous, intellect derived from the Latin intelligere, from which derives the term intelligence in the French and English languages. The discussion of intellect is in two areas of knowledge that concern the relation between intelligence and intellect.In classical philosophy and in mediaeval philosophy the intellect (nous) is the subject of the question: How do people know things? In Late Antiquity and in the Middle Ages, the intellect was the conceptual means of reconciling the religious faith of monotheism with the facts of philosophy and science about Nature, a reconciliation that would make the intellect the conduit between the human soul, and the divine intellect of the cosmos. In the Late Middle Ages, philosophers developed the distinction that intelligence is in two modes passive intellect and active intellect.In psychology and in neuroscience, the Theory of Multiple Intelligences applies the terms intelligence (emotion) and intellect (mind) to describe how people understand the world and reality.

Intuition is the ability to acquire knowledge without recourse to conscious reasoning. Different fields use the word "intuition" in very different ways, including but not limited to: direct access to unconscious knowledge; unconscious cognition; inner sensing; inner insight to unconscious pattern-recognition; and the ability to understand something instinctively, without any need for conscious reasoning.

The mind is the set of faculties responsible for mental phenomena. Often the term is also identified with the phenomena themselves. These faculties include thought, imagination, memory, will and sensation. They are responsible for various mental phenomena, like perception, pain experience, belief, desire, intention and emotion. Various overlapping classifications of mental phenomena have been proposed. Important distinctions group them together according to whether they are sensory, propositional, intentional, conscious or occurrent. Minds were traditionally understood as substances but it is more common in the contemporary perspective to conceive them as properties or capacities possessed by humans and higher animals. Various competing definitions of the exact nature of the mind or mentality have been proposed. Epistemic definitions focus on the privileged epistemic access the subject has to these states. Consciousness-based approaches give primacy to the conscious mind and allow unconscious mental phenomena as part of the mind only to the extent that they stand in the right relation to the conscious mind. According to intentionality-based approaches, the power to refer to objects and to represent the world is the mark of the mental. For behaviorism, whether an entity has a mind only depends on how it behaves in response to external stimuli while functionalism defines mental states in terms of the causal roles they play. Central questions for the study of mind, like whether other entities besides humans have minds or how the relation between body and mind is to be conceived, are strongly influenced by the choice of one's definition.

An opinion is a judgement, viewpoint, or statement that is not conclusive, rather than facts, which are true statements.

Perception is the organization, identification, and interpretation of sensory information in order to represent and understand the presented information or environment.

In philosophy, a point of view is a specific attitude or manner through which a person thinks about something. This figurative usage of the expression dates back to 1760. In this meaning, the usage is synonymous with one of the meanings of the term perspective.

Subjective idealism, or empirical idealism, is a form of philosophical monism that holds that only minds and mental contents exist. It entails and is generally identified or associated with immaterialism, the doctrine that material things do not exist. Subjective idealism rejects dualism, neutral monism, and materialism; indeed, it is the contrary of eliminative materialism, the doctrine that all or some classes of mental phenomena do not exist, but are sheer illusions.

Subjective well-being (SWB) is a self-reported measure of well-being, typically obtained by questionnaire.

In their most common sense, the terms thought and thinking refer to conscious cognitive processes that can happen independently of sensory stimulation. Their most paradigmatic forms are judging, reasoning, concept formation, problem solving, and deliberation. But other mental processes, like considering an idea, memory, or imagination, are also often included. These processes can happen internally independent of the sensory organs, unlike perception. But when understood in the widest sense, any mental event may be understood as a form of thinking, including perception and unconscious mental processes. In a slightly different sense, the term thought refers not to the mental processes themselves but to mental states or systems of ideas brought about by these processes.