SMARTE
The Stanford Mental Arithmetic Response Time Evaluation (SMARTE) is part of the NeuroCognition group of tests administered in the ABCD study. It is a series of three math tasks, designed to measure a participant's math ability. In the ABCD study, SMARTE runs cohesively as one big math task via Inquisit by Millisecond on an iPad. There is also a version running on Pavlovia that we are piloting in the lab and will be sharing soon.
Structure of SMARTE 
The SMARTE consists of three, 2 minute tasks: 1. Enumeration: 2 minutes of dot enumeration 2. Math Fluency: 2 Phases
3. Math Recall: 2 Phases
Additionally, there is a math anxiety question upon completion of the three above tasks. 

Instructions 
All instructions are read by an audio recording. 
Buttons 
The participant enters their responses on a 09 numberpad (see below for an illustration). They can use the correction button to backspace what they have typed, before pressing the submit button. 
Trial Time Limit

Tasks are timed and the participant should attempt to respond to trials as quickly as possible. On all problems (except mathrecall "challenge" problems), participants have a 7 second deadline to submit an answer. After 7 seconds, a "too slow" message appears in red on the screen, and the task automatically proceeds to the next trial. Once a participant accumulates 3 timeout feedback events within a twominute task, the timeout deadline is released for the remainder of that task. The 7second deadline is released in the mathrecall task after the 24th item (i.e. beginning of "challenge" problems). 
Trial Feedback 
Feedback is only given on practice trials. Participants do not receive feedback on subsequent test trials. 
Practice Trials 
Enumeration: 2 practice trials with realtime feedback; practice will repeat if trials were not answered correctly (up to 4 practice trials). Math fluency: 2 practice trials with realtime feedback; practice will repeat if trials were not answered correctly (up to 4 practice trials). Math recall: No practice trials 
Task Items
Enumeration 
Items are dots, ranging from 0 to 9 dots: 04 dots: Used for test problems (Subitizing) 5 dots: Used for practice problems 69 dots: Used for test problems (Grouped vs. Ungrouped) 

Math Fluency 
Phase A Items are singledigit arithmetic problems, oriented veritcally. Answers are smaller than 9. Problems either follow a rule (N ± 0, N ± 1, N ± N) or do not (No Rule). Phase B Items are mixeddigit arithmetic problems, oriented vertically. First operand is a doubledigit number. Second operand is a singledigit number ranging from 09. Answer is a doubledigit number. Problems either involve a carry/borrow step (Regrouping) or not (No regrouping). 
Math Recall 
Phase C Items are 24 Mixeddigit arithmetic problems, oriented vertically or horizontally. First operand is a doubledigit number. Second operand is a singledigit number ranging from 09. Answer is a doubledigit number. Problems either involve a carry/borrow step (Regrouping) or not (No regrouping). Phase D Challenging doubledigit operations (both operands are double digits) requiring regrouping. Vertical or Horizontal orientation. There are also inference problems where first operand is given, second operand is blank, and answer is given (horizontal orientation). 
Summary Variables
SMARTE automatically calculates summary variables for each subject's session. In the ABCD Study, there are a total of 52 curated summary variables. There are three levels of analysis:
 Single raw score aggregating the number of correct items across 6 minutes of test time.
 Number of correct items completed per minute, by subgroup (Enumeration, Single Digit Fluency, Multi Digit Fluency).
 Response times and accuracy, by contrasts within subgroups. They are illustrated in the following table:
Module  dot
sdf mdf 
Dot enumeration
Singledigit arithmetic Multidigit artihmetic 

Dot enumeration  1to4subit
6to9group 6to9noregroup 
Subitzing (up to four dots)
Grouped arrays Ungrouped arrays 
Single digit fluency 
rule norule 
Rule items (N ± 0, N ± 1, N ± N)
Norule items 
Double digit fluency  noregroup
regroup challenge 
Regrouping required
No regrouping required Challenge items from Phase D 
Values  nt
corr to err acc rt 
number of items presented
number of correct responses number of timeouts number of errors proportion correct response mean reaction time for correct responses 
Scientific Resources
In progress.