Psychiatry & Psychology

A neologism is a newly coined word, expression, or term that may be in the process of entering common use. It often results from blending or repurposing existing morphemes and can reflect cultural, technological, or scientific developments. In linguistics, neologisms are studied to understand how language evolves and adapts to new concepts and needs.

Neurasthenia is a historical medical diagnosis describing chronic fatigue and low energy with mental and physical exhaustion. It denotes a condition of nervous debility, often with anxiety or irritability, and was widely used in the 19th and early 20th centuries. Today it’s rarely diagnosed, with overlapping symptoms seen in mood and anxiety disorders.

neuroanatomy is the branch of neuroscience that studies the structure of the nervous system, including the brain, spinal cord, and peripheral nerves. It combines detailed anatomical descriptions with functional implications, helping explain how neural circuits support sensation, movement, and cognition. This expert field integrates anatomy, microscopy, and physiology to map neural organization from cells to systems.

A neuroleptic is a type of antipsychotic medication that primarily acts to reduce agitation, mania, and psychosis by blocking dopamine receptors in the brain. The term also describes drugs designed to produce a calming, tranquilizing effect. In pharmacology, neuroleptics are used to manage symptoms of schizophrenia and similar disorders, often with notable side effects.

Neuropathology is the medical specialty that studies diseases of the nervous system tissue, including brain and nerve disorders, through laboratory and autopsy findings. It combines neurology with pathology to diagnose, characterize disease processes, and understand mechanisms at cellular and molecular levels. This field informs prognosis and research into neurological conditions.

Neuroplasticity refers to the brain’s ability to reorganize itself by forming new neural connections throughout life, enabling learning, adaptation, and recovery after injury. It involves structural and functional changes at synapses and circuits in response to experiences, practice, and environmental demands. This dynamic capability underpins skill acquisition, memory consolidation, and rehabilitation.

Neuropsychiatry is a branch of medicine that studies and treats disorders at the intersection of neurology and psychiatry, including brain-behavior relationships, diagnosis, and integrated care. It focuses on neurobiological factors underlying psychiatric symptoms and conditions, employing multidisciplinary assessment and treatment approaches. The term connotes both neurological and psychiatric expertise applied to complex clinical presentations.

Neuropsychology is the branch of psychology that studies how the brain’s structure and function influence behavior and cognitive processes. It integrates neurology and psychology to understand disorders, cognition, emotion, and how brain injuries affect thinking. Professionals in this field assess, diagnose, and research brain–behavior relationships using psycho- and neurobiological methods.

Neuroticism is a personality trait characterized by a tendency to experience negative emotions, including anxiety, moodiness, and emotional instability. It reflects how strongly individuals react to stress and perceive events, often correlating with susceptibility to worry and self-consciousness. In psychology, it is commonly measured as a dimension of temperament that affects behavior and mental health.

Neurotransmission is the process by which nerve cells communicate, involving the release, diffusion, and receptor binding of neurotransmitters at synapses. It encompasses presynaptic release, synaptic cleft diffusion, and postsynaptic receptor activation, enabling rapid chemical signaling that underpins nervous system function. The term is used across neuroscience, physiology, and pharmacology to describe how neurons convey signals to one another and to target cells.

A chemical that facilitates communication between neurons by transmitting signals across synapses. Neurotransmitters influence mood, cognition, and motor control and include substances like dopamine, serotonin, and glutamate. They are released from presynaptic neurons in response to electrical activity and bind to receptors on postsynaptic cells, shaping neural circuits and responses.

Neurotransmitters are chemicals that relay signals between neurons across synapses, enabling neurotransmission in the brain and nervous system. They are released from one neuron, cross the synaptic gap, and bind to receptors on the next neuron to propagate or regulate signals. Understanding their action is central to neurobiology and psychopharmacology.

Obsession is an intense, consuming interest or preoccupation with a person, object, or idea. It often implies an overpowering focus that can be difficult to control or redirect. In psychology and everyday language, it describes fixed, persistent fixation that dominates thoughts and behavior.

Obsessive describes a tendency to fixate on a person or thing, often to an extreme or compulsive degree. It denotes persistent preoccupation that can influence thoughts, behavior, and emotions, sometimes to the point of impairment. The term is commonly used in psychology, everyday speech, and pop culture to characterize intense focus or fixation.

Occipital is an adjective and sometimes a noun relating to the back part of the skull or the occipital bone, as in occipital nerves or the occipital region. In anatomy, it designates structures or functions located at the posterior base of the skull, typically involved in visual processing and head orientation. The term is used in clinical and academic contexts, often paired with terms like lobe, bone, and muscle.

orbitofrontal is an anatomical adjective referring to the orbital (eye socket) region of the frontal lobe of the brain. It describes structures or processes located on or related to the frontal lobe near the orbits. In neuroscience and medicine, it often appears in discussions of the orbitofrontal cortex and its role in decision-making and emotion.

Palilalia is a speech disorder characterized by involuntary repetition of one's own words or syllables. It often manifests as rapid, automatic repeats that the speaker cannot control, sometimes reflecting a neurological basis. The term is used in clinical literature and can appear in case reports and aphasia assessments, though it is distinct from normal echoing in conversation.

Paranoia is a noun describing an irrational or exaggerated distrust or suspicion of others, often accompanied by delusions or exaggerated beliefs about being persecuted. It can arise as a mental health symptom or be used more casually to describe a feeling of intense mistrust. The term typically refers to a persistent, pervasive pattern rather than a fleeting worry.

Paranoid is an adjective describing an irrational worry or belief that others are plotting against you or watching you. It conveys a sense of distrust or excessive suspicion, often in relation to one’s safety or motives of others. The term can describe a psychological state as well as casual, exaggerated feelings of suspicion.