Description

Mental arithmetic task requiring rapid addition of three two-digit numbers presented vertically

Measures: Mental calculation ability, arithmetic processing speed, working memory for numerical information, and performance under time constraints

arithmetic mental_calculation processing_speed working_memory numerical_processing

Ages: 7+  ·  Populations: adults, adolescents, children (with adequate arithmetic skills), research participants, cognitive assessment batteries

About This Test

The Two-Column Addition Test assesses mental arithmetic ability by requiring participants to rapidly add three two-digit numbers. **Procedure**: Three two-digit numbers (ranging from 11-99, no zeros) are presented vertically in columnar format. Participants must mentally calculate the sum and enter their answer using the keyboard number keys. The answer must be entered left-to-right (hundreds digit first, then tens, then ones if applicable). Participants can use backspace to correct mistakes before pressing Enter to confirm. **Timing**: Each problem has a 15-second time limit. If participants fail to respond within this time, a buzzer sounds and the next problem appears. Practice trials provide feedback on accuracy and response time; test trials do not. **Phases**: 1. **Practice Phase** (10 trials by default): Problems with feedback showing correct/incorrect and response time 2. **Test Phase** (45 trials by default): Problems without feedback **Scoring**: The test records accuracy, response time to first keypress, completion time, number of keystrokes, and whether timeout occurred. This provides measures of both speed and accuracy in mental arithmetic.

• Part of the UTC-PAB (Unified Tri-Services Cognitive Performance Assessment Battery) as Test 4
• Numbers are randomly generated (11-99 excluding any with 0 digits)
• Buzzer sound (buzz500ms.ogg) plays on timeout
• Instructions updated for web deployment with HTML-lite formatting and AdaptiveTextBox
• Requires numeric keyboard input - not suitable for pure touch interfaces
• Default timeout of 15 seconds is configurable via parameters
• Practice trials provide accuracy feedback and completion time; test trials do not
• LSL support added: markers for block start/end, stimulus onset, response submission/timeout, and trial accuracy
• Available in 7 languages: English, German, Spanish, French, Italian, Dutch, Portuguese

Test Details

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