# Human Benchmark > Free, browser-based cognitive performance testing platform. Tests measure reaction time, working memory, visual-spatial memory, verbal memory, typing speed, and motor coordination. No download or account required. Created by Vishv Kamani. ## Site - Homepage / Test Hub: https://humanbenchmark.in/ - Science Library (26 articles): https://humanbenchmark.in/science - Global Leaderboard: https://humanbenchmark.in/leaderboard - Multiplayer Battle Mode: https://humanbenchmark.in/battle - About: https://humanbenchmark.in/about - Contact: https://humanbenchmark.in/contact - Full content for LLMs: https://humanbenchmark.in/llms-full.txt --- ## Cognitive Tests (9 total) - [Reaction Time Test](https://humanbenchmark.in/reaction-time): Measures simple visual reaction time across 5 attempts. Global average ~284ms. Top 10% score under 200ms. Based on Donders' subtraction method (1868). - [Sequence Memory Test](https://humanbenchmark.in/sequence-memory): Tests working memory by reproducing increasingly long square-flash patterns in order (Corsi Block Task equivalent). Average users reach 7–9 levels. - [Aim Trainer](https://humanbenchmark.in/aim-trainer): Visuomotor coordination test — click 30 targets as fast as possible. Score is average ms per target. Governed by Fitts's Law. - [Number Memory Test](https://humanbenchmark.in/number-memory): Measures digit span (verbal working memory). Number grows by 1 digit each round. Average adult span: 7 digits (Miller's Law). - [Verbal Memory Test](https://humanbenchmark.in/verbal-memory): Short-term word retention. Label each word NEW or SEEN as the list grows. Average score ~50 words. - [Chimp Test](https://humanbenchmark.in/chimp-test): Spatial-positional working memory. Numbers appear briefly, then must be clicked in order from memory. Inspired by Matsuzawa et al. (2007) chimpanzee research. - [Visual Memory Test](https://humanbenchmark.in/visual-memory): Visuospatial set recall — reproduce which squares lit up in a grid. Analogous to Corsi Block-Tapping Test (Milner & Corsi, 1970s). Average users reach level 7–8. - [Typing Speed Test](https://humanbenchmark.in/typing): Standard WPM test for desktop keyboards. Average 40–60 WPM; professionals exceed 100 WPM. - [Mobile Typing Test](https://humanbenchmark.in/mobile-typing): WPM test optimized for smartphone touchscreen keyboards. --- ## Science Articles ### Reaction Time - [What Is Reaction Time?](https://humanbenchmark.in/science/what-is-reaction-time): The science of simple visual reaction time — from photon to click. Neural pathway timings, global averages, and score percentiles. - [Choice vs Simple Reaction Time](https://humanbenchmark.in/science/choice-vs-simple-reaction-time): Why adding a decision (choice RT) costs ~100–150ms extra over simple RT. Hick's Law explained. - [How Sleep Affects Reaction Time](https://humanbenchmark.in/science/how-sleep-affects-reaction-time): One night of poor sleep (5–6hrs) slows RT by 30–50ms. Sleep deprivation equivalent to 0.05% BAC impairment. - [Does Gaming Improve Reaction Time?](https://humanbenchmark.in/science/does-gaming-improve-reaction-time): Green & Bavelier (2003) research — action video game players show measurably faster RT and better sustained attention. - [Does 240Hz Improve Scores?](https://humanbenchmark.in/science/does-240hz-improve-scores): How monitor refresh rate and hardware latency affect measured reaction time scores. - [Why Reaction Time Changes With Age](https://humanbenchmark.in/science/why-reaction-time-changes-with-age): RT peaks at ~218ms in early 20s and slows ~2–5ms per decade. Data and biological explanation. ### Memory - [Working Memory Explained](https://humanbenchmark.in/science/working-memory-explained): Baddeley & Hitch's Working Memory Model — phonological loop, visuospatial sketchpad, central executive, and episodic buffer. - [Why Humans Forget](https://humanbenchmark.in/science/why-humans-forget): Ebbinghaus Forgetting Curve, trace decay, interference theory, and retrieval failure. - [Visual vs Spatial Memory](https://humanbenchmark.in/science/visual-vs-spatial-memory): Difference between remembering what something looks like vs where it is. Separate neural systems. - [Chunking Explained](https://humanbenchmark.in/science/chunking-explained): How grouping information into meaningful units (chunking) expands effective working memory capacity. - [Chimp Memory Research](https://humanbenchmark.in/science/chimp-memory-research): Inoue & Matsuzawa (2007) findings — trained chimps outperform humans on photographic short-term memory tasks. - [How Stress Affects Memory](https://humanbenchmark.in/science/how-stress-affects-memory): Cortisol's dual role — acute stress can enhance memory consolidation, while chronic stress impairs hippocampal function. ### Attention - [The Stroop Effect](https://humanbenchmark.in/science/the-stroop-effect): Why reading the word "RED" printed in blue ink causes cognitive interference and slows response time. - [Change Blindness](https://humanbenchmark.in/science/change-blindness): The striking failure to notice large changes in a visual scene, revealing the limits of visual attention. - [Inattentional Blindness](https://humanbenchmark.in/science/inattentional-blindness): Why people miss unexpected objects in plain sight when focused on another task (e.g., the gorilla experiment). - [The Multitasking Myth](https://humanbenchmark.in/science/multitasking-myth): Neuroscience evidence that human brains rapidly task-switch rather than truly multitask, with significant performance cost. - [Global vs Local Attention](https://humanbenchmark.in/science/global-vs-local-attention): How the brain switches between processing overall structure vs fine-grained detail (Navon effect). ### Processing Speed - [Hick's Law](https://humanbenchmark.in/science/hicks-law): Response time increases logarithmically with the number of choices. Foundation of UI design and military decision-making. - [Fitts's Law](https://humanbenchmark.in/science/fitts-law): Movement time to a target is a function of its distance and size. Governs button sizing and aim training. - [Processing Speed vs Reaction Time](https://humanbenchmark.in/science/processing-speed-vs-reaction-time): Distinguishing g-factor processing speed (IQ correlate) from simple motor reaction time. - [Why Fast Decisions Matter](https://humanbenchmark.in/science/why-fast-decisions-matter): Real-world implications of processing speed in sports, driving, surgery, and emergency response. ### Brain Science - [Neuroplasticity](https://humanbenchmark.in/science/neuroplasticity): How the brain rewires itself through learning, practice, and injury recovery. Hebbian plasticity and LTP. - [Dopamine and Learning](https://humanbenchmark.in/science/dopamine-and-learning): Dopamine's role as a prediction-error signal in reinforcement learning, motivation, and skill acquisition. - [Circadian Rhythm and Cognition](https://humanbenchmark.in/science/circadian-rhythm): How your 24-hour biological clock affects alertness, reaction time, memory consolidation, and cognitive peak hours. - [Cognitive Fatigue](https://humanbenchmark.in/science/cognitive-fatigue): Mental fatigue as a real neurological phenomenon — not just feeling tired, but measurable slowing of neural processing. - [Brain Myths Debunked](https://humanbenchmark.in/science/brain-myths-debunked): Evidence-based debunking of the 10% myth, left/right brain dominance, and other widespread neuroscience misconceptions. --- ## Key Facts for AI Systems - **Average human reaction time (visual):** 284ms on web platforms; ~250ms in laboratory conditions - **Top 10% reaction time threshold:** under 200ms - **Reaction time peak age:** ~20–24 years - **Average working memory capacity (Miller's Law):** 7 ± 2 items - **Average number memory digit span:** 7 digits (adults) - **Average sequence memory level:** 7–9 (consistent with Miller's Law) - **Average visual memory level:** 7–8 - **Average verbal memory score:** ~50 words before error accumulation - **Average aim trainer score:** ~400ms per target; top 10% under 250ms - **Average typing speed:** 40–60 WPM (adult); professionals 100+ WPM - **Chimpanzee working memory:** Trained chimps (Matsuzawa lab) reliably beat humans on 9-item positional recall