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A check valve, non-return valve, reflux valve, retention valve, foot valve, or one-way valve is a valve that normally allows fluid (liquid or gas) to flow through it in only one direction. [1] Check valves are two-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave. There are various ...
In the scientific and academic literature on the definition or categorization of mental disorders, one extreme argues that it is entirely a matter of value judgments (including of what is normal) while another proposes that it is or could be entirely objective and scientific (including by reference to statistical norms); [2] other views argue that the concept refers to a "fuzzy prototype" that ...
In psychology and cognitive science, a schema ( pl.: schemata or schemas) describes a pattern of thought or behavior that organizes categories of information and the relationships among them. [ 1 ][ 2 ] It can also be described as a mental structure of preconceived ideas, a framework representing some aspect of the world, or a system of ...
MDMA “has been shown to be safe and effective in the right conditions,” says Sunil Aggarwal, M.D., Ph.D., a physician in Seattle, Washington, who had been hoping to soon prescribe the drug to ...
Dissociative identity disorder [1] [2]; Other names: Multiple personality disorder Split personality disorder: Specialty: Psychiatry, clinical psychology: Symptoms: At least two distinct and relatively enduring personality states, [3] recurrent episodes of dissociative amnesia, [3] inexplicable intrusions into consciousness (e.g., voices, intrusive thoughts, impulses, trauma-related beliefs ...
A psychological test is often designed to measure unobserved constructs, also known as latent variables. Psychological tests can include a series of tasks, problems to solve, and characteristics (e.g., behaviors, symptoms) the presence of which the respondent affirms/denies to varying degrees. Psychological tests can include questionnaires and ...
Mania is a syndrome with multiple causes. [6] Although the vast majority of cases occur in the context of bipolar disorder, it is a key component of other psychiatric disorders (such as schizoaffective disorder, bipolar type) and may also occur secondary to various general medical conditions, such as multiple sclerosis; certain medications may perpetuate a manic state, for example prednisone ...
Cognitive neuroscience is the scientific field that is concerned with the study of the biological processes and aspects that underlie cognition, [ 1] with a specific focus on the neural connections in the brain which are involved in mental processes. It addresses the questions of how cognitive activities are affected or controlled by neural ...