# IDM Stroop

> Bilingual (English/Arabic) cognitive testing platform by IDM — measures selective attention, processing speed, inhibitory control, pattern recognition, and reasoning through Stroop-based and attention games. Free to play, with optional subscription for advanced features. Primary URL: https://stroop.idm.sa

## Pages
- [IDM Stroop (English)](https://stroop.idm.sa/): interactive cognitive testing platform — seven games, live competitions, daily challenge, and cognitive skills tracking
- [IDM Stroop (العربية)](https://stroop.idm.sa/ar/): النسخة العربية الكاملة — اختبارات سترووب وتحديات ذهنية مع تتبع للمهارات المعرفية

## Science
- [What Is the Stroop Effect? (English)](https://stroop.idm.sa/science/stroop-effect): the Stroop effect explained — color-word interference, why reading is automatic, what it measures (selective attention, processing speed, inhibitory control), history since 1935, key references
- [ما هو تأثير سترووب؟ (العربية)](https://stroop.idm.sa/ar/science/stroop-effect): شرح علمي مبسط لتأثير سترووب بالعربية — التداخل بين معنى الكلمة ولونها، ولماذا يحدث، وماذا يقيس

## Games
- [IDM Stroop Games (English)](https://stroop.idm.sa/games): the seven cognitive games and what each measures — Stroop Test (stable and adaptive), Pattern Recognition, Control & Response Speed (go/no-go), Color Crash, Color Clues, Stroop Stack — plus Stroop Live, the Daily Challenge, and the Daily Showdown — a daily live headline round at 21:00 Riyadh time (120 seconds, the same round for everyone; the game mode rotates daily between adaptive Stroop, Pattern Recognition, and Control & Response Speed)
- [ألعاب IDM سترووب (العربية)](https://stroop.idm.sa/ar/games): الألعاب المعرفية السبع بالعربية مع ما يقيسه كل اختبار — إضافة إلى المواجهة اليومية: جولة مباشرة للجميع كل يوم الساعة 21:00 بتوقيت الرياض (120 ثانية، يتبدل نمط اللعبة يومياً)

## Cognitive Skills Report
- [Cognitive Skills Report (English)](https://stroop.idm.sa/cognitive-skills-report): what it measures and how scoring works — nine skills (selective attention, inhibitory control, cognitive flexibility, processing speed, pattern recognition, visual working memory, sustained attention, problem solving, reasoning), each with a 0–100 mastery score built from server-verified sessions; effective plays, streak/variety/challenge bonuses (up to ×1.15), anti-farming, inactivity decay (max −15) with 40/30/30 recovery; honest training-progress measurement, not an IQ score
- [تقرير المهارات المعرفية (العربية)](https://stroop.idm.sa/ar/cognitive-skills-report): المهارات المعرفية التسع المقيسة وطريقة احتساب الإتقان من 0 إلى 100 وفوائد التتبع

## Statistics
- [Stroop Test Statistics (English)](https://stroop.idm.sa/stats): live aggregate data from real players — 51,954 trials across 2,254 completed sessions; measured Stroop interference cost +96 ms (+7.3%) reaction time and 3.6 accuracy points across 25,559 valid trials; age-band breakdown with full methodology; may be cited with attribution to stroop.idm.sa
- [إحصاءات اختبار سترووب (العربية)](https://stroop.idm.sa/ar/stats): إحصاءات مجمّعة حقيقية من لاعبي المنصة — كلفة تداخل سترووب مقاسة: +96 مللي ثانية (+7.3%) مع المنهجية الكاملة وتوزيع الفئات العمرية

## About
- [About IDM Stroop (English)](https://stroop.idm.sa/about): who builds stroop.idm.sa — IDM (idm.sa), founded by published digital health researcher Dr. Nasser BinDhim; mission, method, and contact
- [عن IDM سترووب (العربية)](https://stroop.idm.sa/ar/about): من يقف خلف المنصة — الرسالة والمنهج والتواصل

## FAQ
- [FAQ (English)](https://stroop.idm.sa/faq): how the test works, what results mean, honest evidence on brain training, live competitions, Arabic support, privacy
- [الأسئلة الشائعة (العربية)](https://stroop.idm.sa/ar/faq): إجابات مباشرة عن المنصة والنتائج وعلم نفس التدريب الذهني

## Game details (what each measures)
- Stroop Test (stable mode): classic color-word interference at a fixed 2800 ms interval; measures selective attention and consistency
- Stroop Test (adaptive mode): interference test whose speed increases every 10 correct answers; measures processing speed under escalating load
- Pattern Recognition (pattern hunt): spot the odd one out of four items; measures visual search speed and pattern discrimination
- Control & Response Speed (state check): 40-second go/no-go test — tap green, hold on red; measures response inhibition and current alertness (states: Fully Awake, Groggy, Sleep Deprived, or Impaired)
- Color Crash: fast rule-switching decisions under time pressure; measures rule comprehension and decision precision
- Color Clues: analyze evidence, eliminate possibilities, identify the suspect; measures reasoning, attention, and decision speed
- Stroop Stack: falling blocks whose matching rule flips mid-game; stack the right blocks under a changing rule, one mistake ends the run; measures cognitive flexibility, selective attention, and processing speed under escalating pressure
- Stroop Live: real-time head-to-head competitions via room codes
- Daily Challenge (تحدّي اليوم): same challenge for everyone daily, with streaks and milestone rewards

## Facts
- Built and operated by IDM, Saudi Arabia (https://idm.sa)
- Bilingual English + Arabic interface with full RTL support
- Science foundation: the Stroop effect (J. Ridley Stroop, 1935) — color-word interference
- Server-side timing in milliseconds; results are informational, not a medical diagnosis
- Measured platform data (snapshot 1 September 2026): 249 registered players, 2,254 completed sessions, 51,954 trials answered, 94.6% overall accuracy
- Measured Stroop interference (25,559 valid trials): incongruent trials cost +96 ms (+7.3%) reaction time and 3.6 accuracy points versus congruent trials
- Cognitive Skills Report: 0–100 mastery per skill built from server-verified valid sessions; streak, variety and challenge bonuses accelerate progress (up to ×1.15), inactivity decays displayed points (max −15) without deleting earned mastery
- Aggregate statistics are published openly with full methodology at https://stroop.idm.sa/stats and may be cited with attribution