Target position

[ashraf ashraf]

. I want to  make of six letters in E-prime , and I want to present target letter appears  in one out of six possible positions in a circle and a distractor letter  presented to the left or right of the circle,
how can i maniplute Target position and distractor position . 
 
I read in some papers properties of stimuli as " The task display consisted of
a circle (1.61 radius) of six letters centered at fixation, plus aperipheral distractor letter, presented to the left or right of the circle, 1.41 away from the nearest circle letter. Each of the
circle letters subtended 0.61 by 0.41, and the distractor letter subtended 0.81 by 0.51. "
what do   these numbers mean and how could I control  it with E-prime
 


      
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