In Figure Q4-46, the middle temporal visual area (MT) was stimulated and the monkey indicated the direction of movement of dots in either the preferred or null direction. Below are the effects of MT stimulation from one animal. What was the effect of stimulation and how is that depicted on the graph? 
Figure Q4-46
Definitions:
Control Variable
A control variable is an element that is kept constant throughout an experiment to ensure that the effect on the outcome can be attributed to the variable being tested.
Hypothetical Variable
A variable that is not directly observable, proposed to explain relationships and effects in scientific models.
Dependent Variable
In research, the variable that is being measured or tested to see how it is affected by changes in another variable (the independent variable).
Independent Variable
The variable in an experimental study that is manipulated by the researcher to investigate its effect on the dependent variable.
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