"Groupitizing": A Visuo-spatial and Arithmetic Phenomenon

Each row of the matrix “matr” is a trial. The columns contain the following information: 1st: Participant response (enumeration) 2nd: Numerosity shown 3rd: As 1st column 4th: 0 5th: presentation time (s) 6th: RT of numerosity task 7th: 1 or 0; 1 for grouped stimuli and 0 for ungrouped stimuli 8th: Number of items in subgroup 1 9th: Number of items in subgroup 2 10th: Number of items in subgroup 3 11th: Number of items in subgroup 4 12th: NaN if ST, 1 if DT response correct and 0 if incorrect 13th: RT of concurrent time. In ST it is 0.5 14th: 0 or 1; 0 for ST and 1 for DT 15th: 1 if arithmetic, 2 if visuo-spatial, 3 if auditory concurrent task in DT. 16th: timestamp stimulus on screen 17th: timestamp stimulus off screen If DT arithmetic 18th: participant response 19th: First digit 20th: 1 for multiplication, 2 for addition and 3 for subtraction 21st: Second digit 22nd: Correct result If DT visuo-spatial 18th: Target/NoTarget 19th: Participant Response 20th: Participant Response 21st: NaN If DT Auditory 18th: Time presentation second sound 19th: NaN 20th: NaN 21st: NaN