Brain
50 questions tagged Brain — spanning every one of the seven Ws.
Why do we procrastinate?
Procrastination is mostly about managing emotions, not time. We delay tasks that make us feel bored, anxious or insecure to get short-term relief.
What is IQ?
IQ, or intelligence quotient, is a score from standardised tests of reasoning and problem-solving. Tests are set so the average score is 100.
What is sleep paralysis?
Sleep paralysis is being awake but temporarily unable to move or speak while falling asleep or waking up. It often comes with vivid, frightening hallucinations.
Why is exercise good for the brain?
Exercise boosts blood flow, releases growth factors and improves mood chemicals, supporting memory and mental health.
Why do people sleepwalk?
Sleepwalking happens when part of the brain wakes up from deep sleep while the rest stays asleep.
Why do we love music?
Music triggers the brain’s reward system, releasing dopamine, and it helps people bond and express emotion.
What is serotonin?
Serotonin is a chemical messenger involved in mood, sleep, digestion and many other body functions.
What is a concussion?
A concussion is a mild traumatic brain injury caused by a blow or jolt that shakes the brain inside the skull.
What is a stroke?
A stroke happens when blood supply to part of the brain is blocked or a blood vessel bursts, damaging brain cells.
What is synesthesia?
Synesthesia is a neurological trait in which stimulating one sense automatically triggers experiences in another, such as seeing colours when hearing music.
What is a neuron?
A neuron is a nerve cell that transmits information through electrical and chemical signals, forming the basic unit of the nervous system.
Why do we get more forgetful when we are stressed?
Stress hormones like cortisol can interfere with the hippocampus and prefrontal cortex, the brain regions that help form and retrieve memories. A short burst of stress can sharpen attention, but chronic stress usually makes recall worse.
Why do we sometimes feel a burst of clarity after a short walk?
Light physical activity can improve blood flow, arousal, and attention, which may temporarily sharpen thinking. A walk can also interrupt mental fatigue and give the brain a reset.
What is the hippocampus?
The hippocampus is a brain structure important for memory and spatial navigation. It is part of the limbic system in the medial temporal lobe.
What is the medulla oblongata?
The medulla oblongata is the lower part of the brainstem that controls vital automatic functions like breathing, heart rate, and blood pressure. It links the brain to the spinal cord.
What is the hypothalamus?
The hypothalamus is a small brain region that helps regulate body temperature, hunger, thirst, sleep, and hormones. It links the nervous system to the endocrine system.
What is the cerebellum?
The cerebellum is a part of the brain that helps coordinate movement, balance, and fine motor control. It does not start movement, but it makes movement smooth and accurate.
What is the corpus callosum?
The corpus callosum is a thick bundle of nerve fibers connecting the brain’s left and right hemispheres. It allows information to pass between the two sides.
What is neuroplasticity?
Neuroplasticity is the brain’s ability to change its structure and function in response to experience, learning, or injury. It helps explain how people can learn new skills and recover some abilities after brain damage.
What is the amygdala?
The amygdala is a small, almond-shaped group of nuclei deep in the brain that helps process emotions, especially threat and fear. It is also involved in emotional learning and memory.
What is the prefrontal cortex?
The prefrontal cortex is the front part of the frontal lobes involved in planning, decision-making, self-control, and working memory. It helps regulate goal-directed behavior.
What is the default mode network?
The default mode network is a set of brain regions that is active when the mind is not focused on an external task. It is linked to daydreaming, self-referential thought, and remembering the past.
What is the somatosensory cortex?
The somatosensory cortex is the brain region that processes touch, pressure, pain, temperature, and body position. It is found in the parietal lobe.
What is the sensory homunculus?
The sensory homunculus is a body map in the brain showing how much sensory cortex is devoted to different body parts. Hands, lips, and face take up a disproportionate amount of space.
What is the vestibular system?
The vestibular system is the sensory system that helps the brain detect head movement, balance, and spatial orientation. It relies on structures in the inner ear and brain pathways that coordinate posture and gaze.
What is the thalamus?
The thalamus is a deep brain structure that relays and filters sensory information to the cortex. It also helps regulate alertness, attention, and sleep-wake states.
When was the split-brain research of Roger Sperry and Michael Gazzaniga first published?
Their influential split-brain work was published in the early 1960s, with major papers appearing in 1962.
When was the first EEG recorded from a human brain?
The first human electroencephalogram was recorded in 1924 by Hans Berger.
When was the first fMRI study published?
The first functional MRI studies appeared in 1992.
When was the first PET scan of the brain introduced?
Brain PET imaging emerged in the 1970s, with major early human studies appearing around 1975.
When was the first deep brain stimulation procedure performed?
Modern deep brain stimulation began in the late 1980s, with the first successful human procedures performed in 1987.
When was the first detailed map of the human brain published using MRI?
The first high-resolution MRI brain maps appeared in the early 1980s, after MRI entered clinical use around 1980 to 1983.
When was the first description of neuroplasticity widely accepted?
The modern scientific idea of neuroplasticity became widely accepted in the late 20th century, especially from the 1960s onward.
When was the first Alzheimer’s disease case described?
The first recognized Alzheimer’s disease case was described in 1906 by Alois Alzheimer.
Where is the hippocampus located?
The hippocampus is deep within the temporal lobe of the brain, on both sides. It is important for memory formation and learning.
Where is the corpus callosum located?
The corpus callosum is in the center of the brain, between the left and right cerebral hemispheres. It connects the two sides so they can communicate.
Which human organ has the most complex structure of folds and grooves?
The brain has an extremely folded surface, especially the cerebral cortex. These folds increase surface area and allow more neurons to fit in the skull.
Which part of the brain is most associated with forming new episodic memories?
The hippocampus is the key structure for forming new episodic memories. Damage to it can cause severe difficulty making new long-term memories.
Which brain lobe is most associated with executive functions like planning and self-control?
The frontal lobe, especially the prefrontal cortex, is most associated with planning, decision-making, and self-control. It is crucial for executive functions.
How does the brain process information so fast?
The brain processes information using billions of neurons connected in networks. Electrical signals and neurotransmitters let it integrate senses, memory, and decision-making rapidly.
How does memory get stored in the brain?
Memory is stored by changes in synaptic strength and by networks of connected neurons. Different brain areas are involved in short-term memory, long-term memory, and skill learning.
Why do sperm whales have the largest brains of any animal?
Sperm whales evolved very large brains as part of their complex social lives, communication, and deep-diving abilities. Brain size alone does not prove intelligence, but in sperm whales it is linked to advanced behavior.
What is the insula?
The insula is a hidden part of the brain buried deep within the cerebral cortex. It helps process body feelings, emotions, taste, and awareness of internal states.
What is the salience network?
The salience network is a group of brain regions that helps detect what is important and switch attention accordingly. It helps decide whether to focus inward, on the environment, or on a task.
When was the first map of the human brain's functions made?
Early brain-function mapping began in the 19th century, especially with the localization studies of Paul Broca in the 1860s.
Where is the hypothalamus located in the brain?
The hypothalamus is located below the thalamus and just above the brainstem. It forms part of the floor of the third ventricle.
Whose name is linked to the deep groove separating the two brain hemispheres?
The longitudinal fissure is not named after a person. It is the deep groove that separates the left and right cerebral hemispheres.
How many lobes does the human brain have?
The cerebrum is usually described as having 4 major lobes in each hemisphere: frontal, parietal, temporal, and occipital. Some anatomists also recognize the insula as a hidden fifth lobe.
How does the amygdala influence emotions?
The amygdala helps detect emotionally important events, especially threats, and helps the brain assign emotional significance. It works with many other brain regions rather than acting alone.
How does the brain keep balance and coordination?
The cerebellum helps fine-tune movement, timing, and balance by comparing intended movement with actual movement. It is essential for smooth, coordinated action.