Topic Hub
A plain-language reference for the concepts we use across BrainTeases.com - from prefrontal cortex to glymphatic system, from working memory to self-compassion. Every entry links out to the relevant Wikipedia page and back into the games and articles where the idea shows up in practice.
The front-most part of the frontal lobe, home to planning and self-control.
The prefrontal cortex coordinates working memory, decision-making, and inhibition of impulses. It is the last brain region to fully mature, typically not finishing until the mid-20s (Sowell et al., 2003), which has implications for adolescent risk-taking and adult mental health alike.
Seahorse-shaped structure inside the temporal lobe that builds new memories.
The hippocampus is essential for forming new episodic memories - the autobiographical record of what happened to you, when, and where. It is one of the few regions in the adult brain where new neurons are still produced, a process called adult neurogenesis.
Almond-shaped structures that drive rapid emotional appraisal and threat detection.
The amygdala tags incoming information with emotional significance and triggers fast defensive responses before conscious analysis catches up. It is a key node in the brain's fear and reward circuitry and a major target of emotion-regulation practices.
The 'little brain' at the back of the head; coordinates movement, timing, and attention.
Once thought to handle only motor coordination, the cerebellum is now understood to contribute to language, attention, and even emotion regulation (Schmahmann, 2019). It holds more than half of the brain's neurons in a fraction of its volume.
The birth of new neurons in the adult brain, primarily in the hippocampus.
Adult neurogenesis was once considered impossible, then established in the hippocampus by multiple studies (e.g., Boldrini et al., Cell Stem Cell, 2018). The magnitude of the effect remains debated, but the broader principle of lifelong neuroplasticity is uncontroversial.
The mental scratchpad that holds and manipulates information for seconds at a time.
Working memory is the limited-capacity system that keeps a phone number alive while you dial it, holds a sentence in mind while you parse its meaning, and stores intermediate steps of mental arithmetic. Capacity is typically 3-4 chunks for adults (Cowan, 2010), and it is a powerful predictor of academic achievement, reasoning, and reading comprehension.
The brain's control system - planning, inhibition, and flexible switching between tasks.
Executive function refers to the family of top-down cognitive controls that let you set a goal, ignore distraction, and shift strategy when conditions change. It is anchored in the prefrontal cortex and matures slowly into the mid-20s. Differences in executive function are central to how ADHD is understood clinically.
The brain's lifelong ability to rewire its connections through experience.
Neuroplasticity is the umbrella term for the structural and functional changes that follow learning, injury recovery, and even everyday practice. Classic evidence includes the enlarged posterior hippocampi of London taxi drivers (Maguire, 2000) and gray-matter changes after just three months of juggling practice (Draganski, 2004).
The selective allocation of mental resources to one stream of information at a time.
Attention is not one thing but a family of systems - alerting, orienting, and executive control - that together decide what reaches awareness. It is trainable but limited; the human brain cannot truly multitask, only switch.
The cognitive process of identifying regularities in noisy data.
Pattern recognition draws on visual cortex, parietal attention networks, and hippocampal memory. It is over-represented as a strength in autistic perceptual profiles (Mottron, 2006) and is the core skill trained by the Patterns and Visual categories on BrainTeases.com.
The idea that variation in human brains is natural, not a defect.
Coined by sociologist Judy Singer in 1998, neurodiversity reframes conditions like ADHD, autism, and dyslexia as normal cognitive variation with both real challenges and real strengths. It is the editorial lens BrainTeases.com uses for every neurodivergent topic.
A neurodevelopmental difference in attention regulation, impulse control, and dopamine signaling.
Attention-Deficit/Hyperactivity Disorder is characterized by differences in the dopamine system and default-mode network. It comes with measurable challenges and well-documented strengths in divergent thinking, crisis response, and hyperfocus on intrinsically interesting tasks.
A neurodevelopmental difference in social communication, sensory processing, and pattern detection.
Autism is associated with enhanced perceptual functioning - particularly in pattern detection and detail recall - alongside differences in social communication and sensory integration. The DSM-5-TR explicitly allows adult diagnosis, which is increasingly common in women and people of color who were under-referred as children.
A reading-related difference in left-hemisphere phonological processing.
Dyslexia affects 5-10% of the population per the International Dyslexia Association. It is associated with reduced left-hemisphere phonological processing alongside enhanced right-hemisphere visual-spatial reasoning, and is over-represented among entrepreneurs and architects.
An intense, sustained absorption in an intrinsically interesting task.
Hyperfocus is reported especially often by people with ADHD and autism. It is the same neural machinery that, on uninteresting tasks, looks like distractibility - context, novelty, and reward all flip the switch.
The brain's waste-clearance pathway, most active during deep sleep.
Identified by the Nedergaard lab at the University of Rochester (Science, 2013), the glymphatic system flushes metabolic waste - including beta-amyloid and tau - at roughly twice the daytime rate during slow-wave sleep. This is one of the strongest mechanistic links between sleep and long-term brain health.
The nightly state in which the brain consolidates memory and clears waste.
The American Academy of Sleep Medicine recommends 7-9 hours per night for adults. Both shorter and longer durations are associated with elevated cognitive decline risk in long-term epidemiology.
The coordinated nervous-system and hormonal reaction to perceived threat.
The stress response combines fast sympathetic activation with slower cortisol release via the HPA axis. Chronic activation degrades hippocampal function and memory; learnable practices - paced breathing, cognitive reappraisal, social connection - measurably dampen it.
The trainable skill of influencing which emotions you have and how you express them.
Emotion regulation strategies range from in-the-moment paced breathing to higher-level cognitive reappraisal. Reappraisal in particular is a core mechanism of Cognitive Behavioral Therapy, the most empirically supported psychotherapy for anxiety and depression.
Treating yourself with the same kindness you would offer a good friend.
Operationalized by Dr. Kristin Neff at UT Austin, self-compassion is a stronger predictor of mental-health outcomes than self-esteem (MacBeth & Gumley, 2012) and is protective against burnout and depression.
Sustained, non-judgmental attention to present-moment experience.
Formalized clinically as Mindfulness-Based Stress Reduction (MBSR) by Dr. Jon Kabat-Zinn in 1979, mindfulness practice has been shown across dozens of trials (Goyal et al., JAMA Internal Medicine, 2014) to produce moderate improvements in anxiety, depression, and chronic pain.
Functional Magnetic Resonance Imaging - measures brain activity via blood-oxygen changes.
fMRI is the dominant neuroimaging method for studying cognition non-invasively. It tracks the BOLD (blood-oxygen-level dependent) signal rather than neurons directly, so interpretation requires care - a point we keep in mind whenever we cite imaging studies on BrainTeases.com.
The glossary is the index. Deep explainers, citations, and games live across the rest of the site.