Skip to content
SeniorHelp
SDMT — Smith 1982

Symbol-Digit

Match symbols to digits using the key below. Respond as quickly as possible in 90 seconds — a pure test of cognitive processing speed.

Key
◆
1
▲
2
●
3
■
4
★
5
♥
6
✚
7
✿
8
☘
9

You will see one symbol at a time. Tap the correct digit from the table as fast as you can. The next symbol appears automatically after each response. 90 seconds — as many answers as you can.

What is the SDMT test?

Symbol Digit Modalities Test, developed by Aaron Smith in 1982, is considered the most sensitive single-task test for processing speed in neuropsychology. It is used as a primary marker in multiple sclerosis (SDMT decline precedes motor symptoms by years) and as secondary screening in Alzheimer's disease, Parkinson's disease, and frontal lobe lesions.

The mechanism is simple: you see a key with 9 symbols associated with digits 1–9. Symbols then appear one at a time and you must type the corresponding digit as quickly as possible. The more correct answers you give in 90 seconds, the better your processing speed.

Important: you do NOT memorise the symbol-digit association. The key remains visible throughout. SDMT measures pure visuomotor speed — how quickly the eye scans, the brain maps, and the hand responds.

Similar games for the same cognitive domain

If you enjoyed this game, try these alternatives that train the same skills.

Scientifically verified sources

Based on scientific research

Symbol-Digit is a digital adaptation of clinically validated neuropsychological tests. Below you will find the official sources underpinning the methodology, along with international and Romanian medical institutions you can consult for a professional assessment.

📚 Studies and clinical validation

The original scientific papers and validation studies that demonstrate this paradigm measures what it claims to measure.

🌍 Recommendations from international medical institutions

Global organisations (NIH, Mayo Clinic, Alzheimer's Association, WHO, Lancet) that recommend cognitive training as part of a healthy routine for older adults. Direct links to official documents.

🇷🇴 Clinical assessment in Romania

If low scores recur, speak with a doctor. Here is where you can seek specialist advice in Romania — the only national Alzheimer's NGO, the relevant ministry, university neurology clinics, and accredited medical universities.

Important: This game is informational and educational. It is not a medical diagnostic tool. For a clinical assessment, consult a neurologist or psychiatrist. Repeatedly low scores are worth discussing with your GP as an indicator (similar to weighing yourself at home), not as a diagnosis.