Grouping strategies in number estimation extend the subitizing range

In the calculation folder: each file contains a matrix called “MATR”. Each row of the matrix “MATR” is a trial. 

The columns contain the following information:

1st: Number of trial

2nd: Subject response

4th: Response time

5th: first number 

6th: math symbol (1=*; 2= +; 3= –)

7th: second number 

8th: third number 

In the calculation folder: each file contains a matrix called “matr”. Each row of the matrix “matr” is a trial. 

The columns contain the following information:

1st: subject response in the numerosity task

2nd: the presented numerosity 

3rd: subject response in the numerosity task

4th: zero

5th: stimulus duration

6th: Response time in the numerosity task

7th: Grouped (1) or random (2) presentation 

8th: 1

9th: 1

10th: Number of items of the upper-left quadrant

11th: Number of items of the lower-left quadrant

12th: Number of items of the upper-right quadrant

13th: Number of items of the lower - right quadrant

14th: odd shape presented (1=diamond; 2=triangle; 3=circle)

15th: subject response in the shape task

16th: 0.2 in the single task response time in the shape task when dual task

17th: single (0) or dual (1) task

18th: time stimulus on

19th: time stimulus off