se during the test trails the experimenter is not allowed to answer any questions.The subject starts the beginning of test trails, when the subject presses a key at the base of the joystick. When key is pressed a stimulus appears on the screen. It is a circle where one, two, or four arrowheads are positioned inside. The pace where the arrowhead appears gives the subject an indication where the arrowhead may appear again. With one choice trails, the single arrowhead provides information about the direction, where the arrowhead will appear again. With the two choice trails, the information either left or right, or back or forward. Finally, with four choice trails, all four alternatives are possible. At this juncture the subject should not respond to the just observed display.When the arrowheads disappear from the screen, the circle remaining, the subject must wait for a variable fore period of one to three seconds. A single arrowhead is displayed at this point the subject should react as quickly as possible to the stimulus in the appropriate direction. The response ends the trail. At this time the results are displayed on the screen. The experimenter who is not depressing the ENTER key on the keyboard should record the result on a data sheet. The data sheet should include trail number, trail type, required response, subject response, and latency rounded to the nearest millisecond, and a column for failed responses. Failed responses included those responses in the foreperiod and those responses to the wrong direction. After all 144 trail are complete, thank the subject for their time and offer answer any question the may have.Results The means of the first 36 trails and the last 36 trails were analyzed. Within the first and last36 trails an equal number of one choice, two choice and four choice stimuli were supplied. An examination of reaction time as it compares to complexity of task revealed a simple main effect, suggesting...
