Psychology and Brain
53 questions tagged Psychology and Brain — spanning every one of the seven Ws.
How do neurons communicate with each other?
Neurons pass signals using electrical impulses and chemical messengers called neurotransmitters. At a synapse, one neuron releases neurotransmitters that bind to receptors on the next cell.
How does the brain form memories?
Memories are formed when networks of neurons change their connections through repeated activity. The hippocampus helps create new memories, while long-term storage is distributed across the brain.
How does the brain decide what to pay attention to?
The brain filters information by combining goals, emotions, and sensory input. Networks in the frontal and parietal lobes help prioritize what seems most important right now.
How do sleep stages change the brain during the night?
Sleep cycles between NREM and REM stages about every 90 minutes. Deep NREM sleep supports physical restoration, while REM sleep is linked to vivid dreams and memory processing.
How does the brain create emotions like fear?
Fear involves brain circuits that detect threat, especially the amygdala and related networks. These systems help trigger fast body responses before you can consciously think through the danger.
How does stress affect the brain over time?
Short-term stress can sharpen attention, but long-term stress can disrupt sleep, memory, and mood. Prolonged cortisol exposure is linked to changes in the hippocampus and prefrontal cortex.
How does the brain tell us where our body is in space?
The brain uses proprioception, a sense that comes from sensors in muscles, tendons, and joints. This information helps you move without constantly watching your limbs.
How does the brain recognize faces so quickly?
Face recognition depends on specialized visual networks, especially in the temporal lobe. The fusiform face area is strongly involved in identifying and distinguishing faces.
How does the brain learn habits?
Habits form when repeated actions become automatic through brain circuits involving the basal ganglia. With repetition, behavior needs less conscious control from the prefrontal cortex.
How does the brain process pain?
Pain starts with nerve signals from the body but is shaped by the brain’s interpretation of danger. The brain can amplify or reduce pain depending on context, attention, and emotion.
How do neurotransmitters influence mood?
Neurotransmitters help brain cells communicate, and some are strongly linked to mood and motivation. Serotonin, dopamine, norepinephrine, and GABA all play different roles in emotional regulation.
How does the brain keep time?
The brain uses networks in the cortex, cerebellum, and basal ganglia to estimate time intervals. There is no single internal clock; timing is distributed across several systems.
How does the brain understand language?
Language relies on networks in the left hemisphere for many people, especially areas involved in speech production and comprehension. Broca’s area and Wernicke’s area are classic language-related regions.
How does the brain recover after a stroke?
Recovery happens through neuroplasticity, as surviving brain areas take over some lost functions. Rehabilitation helps the brain relearn skills by strengthening new pathways.
How do mirror neurons work?
Mirror neurons are cells that fire both when you act and when you see someone else do the same action. They are thought to help with understanding actions and imitation.
How does the brain distinguish memories from imagination?
The brain uses overlapping networks for memory and imagination, especially the hippocampus and default mode network. It checks details, context, and familiarity to separate real events from imagined ones.
How does the adolescent brain change during puberty?
During adolescence, the brain prunes unused connections and strengthens important ones. The prefrontal cortex matures later than emotion and reward systems, which helps explain teenage risk-taking.
How does chronic anxiety affect the brain?
Chronic anxiety keeps threat circuits active and can make the brain more alert to danger cues. Over time, it may interfere with memory, sleep, and emotional regulation.
How do placebos change the brain?
Placebos can reduce symptoms because expectations activate the brain’s own pain- and stress-regulation systems. They do not contain an active drug, but they can still cause measurable biological effects.
How does the brain generate dreams?
Dreams are linked to brain activity during sleep, especially REM sleep, though they can also occur in other stages. They likely reflect memory, emotion, and spontaneous brain activity combined.
How does the brain control voluntary movement?
Voluntary movement starts in motor areas of the brain and travels through the spinal cord to muscles. The motor cortex plans the action, while the cerebellum and basal ganglia help refine it.
How does the brain process music?
Music activates networks for hearing, memory, movement, and emotion. Rhythm, melody, and lyrics are processed in different but connected brain systems.
How does neuroplasticity help people learn new skills?
Neuroplasticity is the brain’s ability to change its connections in response to experience. With practice, relevant circuits strengthen, making new skills faster and more accurate.
How do emotions influence decision-making?
Emotions help the brain weigh rewards, risks, and social outcomes. Decision-making uses both emotional circuits and rational planning networks, not just logic alone.
How does the brain create the experience of consciousness?
Scientists think consciousness emerges from coordinated activity across many brain networks, especially those involved in awareness, attention, and integration. There is no single known ‘consciousness center.’
How do brain scans show activity in the brain?
Brain scans detect activity indirectly by measuring blood flow, electrical signals, or magnetic changes. Common methods include EEG, fMRI, and PET.
When was the first electroencephalogram (EEG) recorded in humans?
The first human EEG was recorded in 1924 by German psychiatrist Hans Berger. He later published his findings in 1929.
When was the first brain imaging scan of a living person done with a CT scanner?
The first CT scan of a living human brain was performed in 1971. CT was introduced clinically in the early 1970s.
When was the first MRI scan of a human brain performed?
The first MRI scan of a human brain was made in 1977. MRI became a major medical imaging tool in the 1980s.
When was the human hippocampus first linked to memory in modern neuroscience?
The hippocampus became strongly linked to memory after the famous patient H.M. in the 1950s. His surgery in 1953 was especially important.
When was split-brain surgery first used to treat epilepsy?
Split-brain surgery began being used in the 1940s, and it was developed further in the 1950s and 1960s. It involved cutting the corpus callosum.
When was the first lobotomy performed?
The first prefrontal lobotomy was performed in 1935. It was developed by Portuguese neurologist António Egas Moniz.
When was the first successful deep brain stimulation for Parkinson’s disease performed?
Deep brain stimulation for Parkinson’s disease began in the late 1980s and early 1990s. It became a standard treatment later in the 1990s.
When was the first successful treatment of obsessive-compulsive disorder with exposure therapy reported?
Exposure-based behavior therapy emerged in the 1950s and was developed further in the 1960s and 1970s. It became a core OCD treatment later in the 20th century.
When was the Stroop effect first published?
The Stroop effect was published in 1935 by John Ridley Stroop. It remains a classic finding in psychology.
When was the first false-memory experiment on humans published?
Classic research on implanted false memories took off in the 1990s. Elizabeth Loftus’ work became especially influential in 1990.
When was the term 'working memory' introduced in cognitive psychology?
The term working memory emerged in the 1960s. It was developed in modern form by researchers such as Alan Baddeley and Graham Hitch in 1974.
When was the first demonstration of mirror neurons reported?
Mirror neurons were first reported in 1992 by researchers in Italy. They were discovered in macaque monkeys.
When was the first functional MRI study of brain activity published?
The first fMRI studies were published in the early 1990s, especially in 1991 and 1992. fMRI quickly became a major brain-scanning method.
When was the first map of the motor cortex published?
The motor cortex was mapped in the early 20th century, with major work by Wilder Penfield in the 1930s and 1940s. His famous homunculus map came later in the 20th century.
When was the place theory of emotion first proposed?
Modern theories of emotion localization in the brain were proposed in the late 19th and early 20th centuries. A major milestone was James Papez’s 1937 circuit model.
When was the first evidence that stress hormones affect the brain published?
Clear evidence linking stress hormones to brain effects came in the mid-20th century. Hans Selye’s stress research began in the 1930s.
When was the first self-control experiment using delayed gratification published?
The famous marshmallow-style delayed gratification studies were published in the late 1960s and early 1970s. Walter Mischel led this research.
When was the first evidence for neuroplasticity in adult humans reported?
Strong evidence for adult brain plasticity emerged in the late 20th century, especially in the 1980s and 1990s. Scientists showed that the adult brain can change with learning and experience.
When was the first published case of prosopagnosia, or face blindness?
Descriptions of face blindness appeared in the 19th century, but it was clearly defined in the 1940s by German neurologist Joachim Bodamer. His paper was published in 1947.
When was the first modern cognitive-behavioral therapy (CBT) framework developed?
CBT developed in the 1960s and 1970s. Aaron Beck and Albert Ellis were two of its key founders.
When was the first reliable human lie detection polygraph developed?
Early polygraph devices appeared in the 1920s. John A. Larson’s version was developed in 1921.
When was the first brain-computer interface demonstrated?
Early brain-computer interface research began in the 1970s. A landmark demonstration was made in 1973 by Jacques Vidal.
When was the first human study of the placebo effect published?
The placebo effect was discussed in modern medicine in the 18th century, but human scientific study expanded in the 20th century. Henry K. Beecher’s 1955 paper was especially influential.
When was the first evidence that sleep is linked to memory consolidation reported?
Scientific evidence linking sleep and memory grew in the 20th century, with major work in the 1950s and later decades. REM sleep was identified in 1953.
When was the first description of autism as a distinct condition published?
Leo Kanner published the first major clinical description of autism in 1943. Hans Asperger published a related description in 1944.
When was the first evidence that the amygdala plays a role in fear learning reported?
Evidence grew strongly in the 20th century, especially from the 1970s and 1980s. The amygdala became central to fear research during that period.
When was the first published study showing that psychotherapy can change brain activity?
Evidence that psychotherapy changes brain activity became clear in the 1990s. Early neuroimaging studies showed measurable changes after treatment.