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Time is the independent variable.
It would depend what aspect of perception you are measuring and how you are measuring it.
The independent variable. The output variable is dependent on this variable's value and so is called the dependent variable.
The independent variable is the thing you are changing/varying. The dependent variable is the thing you are measuring. This variable should be affected by the independent variable. Control variables are anything that must be kept constant. If there are any other factors which affect the dependent variable, then these need to be controlled so that they do not have any significant effect (basically ensuring that you are actually measuring the effects of the independent variable).
it is an unusual variable called the protocathletica variable.