Tools in This Collection
Reaction Time Test
Measure your visual reaction time in milliseconds — average is 200-250ms
Number Memory Test
Test your digit span — average working memory holds 7 numbers
Verbal Memory Test
Measure how many words your working memory can hold and recall
Sequence Memory Test
Test working memory capacity with ordered pattern sequences
Visual Memory Test
Measure spatial and visual pattern retention ability
Visual Acuity Test
Approximate your Snellen chart result in a browser
Color Blindness Test
Screen for red-green and blue-yellow color vision deficiency
Hearing Frequency Test
Check which audio frequencies you can detect
Peripheral Vision Test
Measure how far your visual field extends from center
Stroop Effect Test
Measure cognitive interference and selective attention speed
Rhythm Timing Test
Test your beat synchronization accuracy and timing precision
Benchmarking Your Cognitive Speed and Sensory Acuity
Cognitive tests fall into three categories: reaction and timing tests (how fast your brain processes and responds), memory tests (how much your working memory can hold and sequence), and sensory tests (how accurately your eyes and ears function). Each category produces objective measurements you can benchmark and track over time.
Reaction Time: What the Numbers Mean
Average adult visual reaction time is 200-250 milliseconds — the time from seeing a stimulus to initiating a physical response. This is a full sensory processing cycle: retina receives light → signal travels to visual cortex → cortex processes the stimulus → signal travels to motor cortex → motor neuron fires → muscle contracts. Gamers and athletes who train reaction consistently test 150-180ms. Reaction time degrades measurably after age 25-30, typically adding 1-2ms per year of age. The Reaction Time Test measures multiple attempts and shows your median — a better measure than your best or worst single attempt.
Memory: Miller's Law and Working Memory Capacity
George Miller's 1956 paper established that working memory holds 7 ± 2 items at once — typically between 5 and 9 chunks of information. The Number Memory Test tests this directly with digit span sequences. A score of 7 is perfectly average; 9+ is exceptional. The Sequence Memory Test adds an ordering component, testing whether your working memory can maintain position as well as content. The Verbal Memory Test uses words instead of numbers — verbal memory engages different encoding pathways and tends to score slightly higher than digit span because words have semantic associations that aid recall. The Visual Memory Test measures spatial/visual pattern retention, a separate memory system from verbal working memory.
Vision and Color Blindness
The Visual Acuity Test approximates the Snellen chart test in a browser — 20/20 vision means you can see at 20 feet what a normal eye sees at 20 feet. The Color Blindness Test uses Ishihara-style pseudoisochromatic plates that are the standard screening method for red-green color vision deficiency, which affects about 8% of men and 0.5% of women. Deuteranopia (green blindness) and protanopia (red blindness) are the most common forms. The Peripheral Vision Test measures how far your visual field extends from center — useful for anyone who plays sports requiring wide field awareness. The Hearing Frequency Test checks which frequencies you can detect — high-frequency hearing loss (8000+ Hz) often appears before you notice it in conversation, as speech frequencies sit below 4000 Hz.
Cognitive Interference and Rhythm
The Stroop Effect Test measures cognitive interference — the delay between reading the color word and identifying the ink color when they conflict. This is a reliable measure of selective attention and executive control. Average Stroop interference adds 100-200ms per item compared to a congruent baseline. The Rhythm Timing Test measures beat synchronization accuracy — relevant for musicians, dancers, and anyone interested in timing precision.
Frequently Asked Questions
What is a good reaction time?
Average adult visual reaction time is 200-250 milliseconds. Athletes and competitive gamers who train reaction often test 150-180ms. Reaction time is slower in the morning and improves after warming up. It also degrades with age — expect 1-2ms slower per year after your mid-20s. The online test adds slight browser latency, so results are typically a few milliseconds slower than lab-measured times.
How common is color blindness?
Color blindness (color vision deficiency) affects about 8% of men and 0.5% of women of Northern European descent. Red-green deficiency is by far the most common form — deuteranopia (green blindness) and protanopia (red blindness) together account for 99% of cases. Blue-yellow deficiency (tritanopia) is very rare. Color blindness is almost always inherited and currently has no cure, though specialized glasses can improve color discrimination in some cases.
Can these cognitive tests help me improve my memory?
Testing identifies your current baseline, which is the first step in improvement. Working memory capacity can be increased somewhat with consistent training — n-back tasks and digit span practice show modest but real gains in controlled studies. The larger benefit of regular cognitive testing is tracking changes over time: gradual decline can be caught early, and improvements from lifestyle changes (sleep, exercise) become measurable.
How does the Stroop test work?
The Stroop effect occurs when the meaning of a word conflicts with the task of identifying its ink color. Reading 'RED' written in blue ink requires suppressing the automatic reading response to focus on the perceptual color task. This takes measurably longer — typically 100-200ms per item — than a congruent condition (RED written in red). The interference effect is largest when you're tired or distracted, making it a sensitive measure of current executive function.