Dear all,
I was wondering whether someone could help this lay-person who tries to programme the serial seven test in E-prime.
Serial Sevens involves presenting a participant with a starting number from which they must subtract 7, then subtract 7 from the resultant number and so on. A randomly generated starting number between 800 and 999, which disappears at the first key-press, is displayed on the monitor of a desktop computer. Responses are made in the form of three-digit numbers, which are recorded via the numeric keypad. Each key-press results in an asterisk being displayed in the first, second or third position, as appropriate, in a box on the screen. Pressing the 'enter' key signals the end of each response and clears the three asterisks in the box ready for the next three-digit number. Duration of the task: 2 minutes. The taks is scored for both total number of subtractions and number of errors. In the case of a mistake, subsequent responses are scored as positive if they are correct in relation to the new number.
This task is particularly difficult to design because there are no set correct and incorrect answers, as this relies on the previous response. However, I am sure that it is possible to programme E-prime to determine whether an answer is correct based on a previous answer... but how..?
If someone could provide me with a sample or ready-to-use script, that would be really great! Thank you very much in advance for your responses,
Nelly van der Meer