By comparing reaction times across different tasks, donders was able to conclude how long the mind needs to perform a certain cognitive task. donders interpreted the difference in reaction time between the simple and choice conditions of his experiment as indicating how long it took to

Answer :

I believe the answer is: make a decision about the stimulus.
It's written in this part of  the research:
. . .difference in reaction time between the simple and choice conditions of his . . 
Simple conditions resulted in fast reaction time, which also make it faster for individuals to make a decision about the stimulus. The opposite would happen if the conditions are more complicated.

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