Learn psychology, one topic at a time.

Psychology is the scientific study of behaviour and mental processes, and it is the foundation on which every other topic in this course rests. It is systematic, empirical and applied: it asks precise questions, gathers evidence, and uses that evidence to help people live and function better. This lesson defines the field, maps its nature and scope, states its goals, surveys its branches and methods, and clears up some common misconceptions.

Psychology grew out of philosophy and physiology, then broke away to become an independent empirical science in the late nineteenth century. Its history is best understood as a series of influential schools of thought, each reacting to the limits of the one before it. Knowing these schools explains why psychologists today ask such different questions and use such different methods.

Psychology is a science, so it depends on systematic research methods and statistics to describe, explain, predict and influence behaviour. Methods determine whether a claim is trustworthy; statistics determine whether an apparent effect is real or merely chance. Together they turn speculation into testable, replicable knowledge.

Behaviour is the result of the integrated functioning of the nervous system and the endocrine system. The brain receives information, interprets it, and issues commands; hormones modulate these processes over longer timescales. Understanding this biology explains why experience, mood and action have physical causes — and grounds the biological perspective in History & Schools of Psychology.

Sensation is the process by which our sensory organs receive stimuli from the internal or external environment and transmit the information to the brain for processing. It is the raw input stage of experience: before we can interpret the world, our receptors must first detect it. Sensation supplies the data that Perception then organises into meaningful wholes, and it sets the limits on what we can attend to and become conscious of.

Perception is the process of organizing and interpreting sensory information to give it meaning. Where sensation is the raw detection of physical energy, perception is the active construction of a meaningful world from that input — shaped by past experience, expectations and context. It underpins every higher mental function, from Attention and Memory to reasoning and Language, because nothing enters the mind that has not first been perceived.

Attention is the mental process of selectively concentrating on a particular stimulus while ignoring others. It is the gateway that decides which of the countless signals reaching us enters perception, memory and conscious thought, which is why it is inseparable from motivation and consciousness. Its capacity is limited, so how it is allocated determines what we notice, learn and remember.

Learning is a relatively permanent change in behaviour (or the potential for behaviour) due to experience. It is the process through which organisms adapt to their environment, and it supplies the habits, skills and knowledge that memory later stores and retrieves. Understanding learning matters because its principles — association, reinforcement and observation — explain both adaptive change and maladaptive patterns such as phobias and addictions.

Memory is the process of encoding, storing and retrieving information — the foundation of learning and cognition. Without it, every experience would vanish the moment it ended and no skill, fact or identity could accumulate. Memory is best understood not as a single store but as a system of interacting components, each with its own capacity, duration and code.

Cognition refers to all mental activities associated with knowing: thinking, knowing, remembering and communicating. It includes problem-solving, decision-making and language, and it depends on the memory stores and perception that supply its raw material. This lesson examines how concepts organise knowledge, how we solve problems and make judgments, and how language both expresses and shapes thought.

Intelligence is the ability to learn, understand, reason, solve problems and adapt to new situations. It is one of the most studied yet most contested constructs in psychology, because it predicts academic and occupational outcomes but is surprisingly hard to define. This lesson traces the nature of intelligence, the major theories and theorists, how IQ is measured, and why emotional intelligence has become a popular companion idea.

Consciousness is our awareness of ourselves and our environment. It is the private, subjective stream of experience that psychology once avoided as unscientific and now studies through sleep research, neuroimaging and the study of altered states. This lesson surveys the levels of consciousness, the biology of sleep and dreaming, sleep disorders, and states such as hypnosis, meditation and psychoactive drug effects.

Motivation is the inner drive that initiates, directs and maintains behaviour towards a goal. It explains why we start an activity, how long we persist and why some goals energise us while others drain us. This lesson covers the nature and types of motivation, biological and social motives, achievement motivation, and Maslow's influential hierarchy of needs.

Emotion is a complex psychological state involving feelings, physiological changes and behavioural responses. Emotions organise our attention, motivate action and colour every relationship, yet their exact sequence — body first, mind first, or both together — has divided psychologists for over a century. This lesson examines the nature and components of emotion, types of emotions, the physiology behind them, the classic theories, expression and regulation.

Stress is a physical and psychological response of the body to any situation or demand that is perceived as challenging, threatening or difficult to manage. It is not the event itself but our appraisal of it that determines whether we cope or crumble. This lesson covers types and causes of stress, the two-stage physiological response, its physical and psychological effects, coping strategies, and the link between chronic stress and illness.

Personality is the unique and relatively stable pattern of thoughts, feelings and behaviours that makes a person who they are — the psychological "signature" that remains recognisable across time and situations. It matters because personality predicts how people form relationships, cope with stress, make decisions and respond to treatment, and because it can be measured reliably enough to be studied scientifically. This lesson covers what personality is, the forces that shape it, the major theories (psychoanalytic, trait, type, humanistic, social-learning and biological) and how it is assessed.

Defence mechanisms are unconscious psychological strategies used by the ego to reduce anxiety and protect the individual from unacceptable thoughts, feelings or situations. They matter because they explain how ordinary people manage everyday stress and how, when overused or rigid, the same processes sustain anxiety disorders and psychological disorders. This lesson covers their nature and functions, the classic list of defences, their origins in Freud and Anna Freud, and how to tell adaptive from maladaptive use.

Frustration is the emotional state produced when a goal is blocked, and conflict is the psychological tension of choosing between incompatible motives — together they are two of the most common sources of everyday stress. They matter because unresolved frustration and conflict feed aggression, anxiety and poor adjustment, yet they can also be managed with the same problem-solving and coping skills that build resilience. This lesson defines both, explains their causes and effects, maps the classic types of conflict, and outlines practical ways to cope.

Adjustment is the process by which a person changes or modifies their thoughts, feelings, attitudes and behaviour to maintain a satisfactory relationship with themselves and their environment. It matters because adjustment is what turns ordinary demands — a new job, an exam, a bereavement — into either growth or breakdown, and because maladjustment is the shared pathway behind much stress, anxiety and psychological disorder. This lesson defines adjustment, describes its characteristics and stages, distinguishes normal adjustment from maladjustment, and outlines its causes and mechanisms.

Developmental psychology studies the pattern of change in human behaviour from birth to death. It matters because understanding when and how abilities emerge — motor control, language, reasoning, identity, attachment — explains both typical development and the origins of developmental delay and later psychological disorders. This lesson covers the meaning of development, how it differs from growth, its guiding principles and influences, the major life stages, and the classic stage theories of Piaget, Erikson, Bowlby, Vygotsky and Kohlberg.

Social psychology is the scientific study of how a person's thoughts, feelings and behaviours are influenced by the presence — actual, imagined or implied — of other people. Where personality psychology asks how the individual differs from others, social psychology asks how the situation and the group shape almost everyone. It matters because so much of daily life — helping, prejudice, conformity, leadership — is explained less by character than by context.

Communication is the process of exchanging information, ideas, feelings and thoughts between two or more people through verbal and non-verbal means, in order to achieve mutual understanding. It is the connective tissue of every clinical and social interaction: assessment, diagnosis, therapy and teamwork all depend on it. This lesson covers the communication process, its barriers, and the therapeutic style that builds trust with a patient.

Psychological disorders are patterns of thought, emotion and behaviour that cause significant distress or impairment in functioning and are not simply expected reactions to circumstances. How we decide what counts as a disorder — and how we classify it — shapes diagnosis, treatment and stigma. This lesson covers the normal/abnormal distinction, key diagnostic categories, and the foundations of psychological management.

Psychological disorders are treated with psychotherapy (psychological methods) and biomedical therapies (medication and physical interventions), often in combination. Understanding why each approach works — and for whom — is central to clinical practice. This lesson surveys the major schools of therapy, the biomedical options, and the evidence about what helps most.

Pain is an unpleasant sensory and emotional experience associated with actual or potential tissue damage. It is both a physical and a psychological experience. Understanding the psychology of pain explains why injury and suffering are not the same thing, and why thoughts, emotions and beliefs are legitimate targets for treatment. This lesson covers the definition of pain, its psychological influences, and evidence-based psychological management.

A comprehensive glossary of the key terms and concepts used across the Psychology Mastery course, arranged alphabetically.

Short walkthroughs of how Berhana works, and public introductions from the clinicians on the roster.