Answer:
The research method is known as habituation.
Step-by-step explanation:
In Psychology, habituation refers to the lessening of a physiological or emotional response to a certain stimulus after a repeated exposure to it. This occurs because the individual gets used to the stimulus to the point where it may not be noticeable, it tends to be ignored.
This can clearly be seen in the experiment; Mariska is being exposed to the circles with the dots so she will soon get used to it and might not notice it further.