The second digit was the longest of the three digits present, while the first was shortest.
Trials began with a fixation cross presented in the center of the display for 500 ms. This was followed by a single digit presented at fixation (low load) or 6 digits presented in a central row (high load) for 1000 ms. To erase any visual memory of the digits, a visual mask was then presented for 2000 ms, consisting of a row of 17 hash marks taking the same positions as the digit memory set.
In mammals the number of digits varies, but the number of phalanges in each digit present usually corresponds with that of humans.
T2 was never the same digit as T1, nor the same as any digit presented in the memory set.
After each recall, a new string of digits was presented, with each successive string increased by one digit until the subject recalled the last string consisting of 9 digits.
The digits were presented randomly with a rate of one per second with a presentation time of 50 ms. In order to assess general cognitive ability, we administered the LPS3 (Leistungspruefsystem).
On each trial, a different string of eight digits was presented, with all digits appearing simultaneously.
Each subject was presented with strings of simple numbers (from 1 to 9) using flashcards, beginning with a string of two digits and presenting one digit per second.
SPAM: Experiments with Digit Recognition.
The pairing of digit and symbol was kept constant during the study, but the order in which the digits were presented in the list to be completed with symbols was different from one testing time to the next.
When stimulus digits were presented in midline position, time perception was biased according to the magnitude of the digit: the duration of test low digits was underestimated compared with that of reference high digits and vice-versa, as revealed by the significant difference of bisection points in the two conditions (unpaired t-test: t = 12.2; p = 0.0001).
