Sustained Attention
A continuous performance task measuring vigilance and impulse control.
X
TAP the box
A
IGNORE all others
1Letters flash quickly · stay focused for 60 seconds
2React as fast as you can when you see X
90s
Vigilance Task
Tap anywhere in the box ONLY on 'X'
·
d' (Sensitivity Index)
InattentiveAverageHighly Focused
0
Hits (Correct)
0
Misses
0
False Alarms
🏆 Score Ranges
Excellent
> 3.5 d'
Top 5%
Good
2.5–3.5
Top 25%
Average
1.5–2.5
Most adults
Below Avg
< 1.5
Bottom 25%
🧠 ADHD Context
d' (d-prime) measures your ability to distinguish a target ('X') from noise (other letters). A lower d-prime indicates either missing targets (inattention) or clicking non-targets (impulsivity).
This "Continuous Performance Task" pattern is widely used in clinical ADHD screening to measure sustained vigilance over a boring, repetitive task.
⚡ What Affects It?
| 😴 | Sleep | Fatigue is the #1 predictor of attention lapses. |
| ☕ | Caffeine | Improves vigilance by 10–15% within 30 min. |
| 🧘 | Meditation | Regular practice boosts sustained attention. |
| 📵 | Distractions | Notifications and noise lower vigilance. |