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. Author manuscript; available in PMC: 2015 May 13.
Published in final edited form as: Atten Percept Psychophys. 2014 May;76(4):1036–1044. doi: 10.3758/s13414-014-0639-x

Fig. 2.

Fig. 2

(Top) Third-person view of the rod-and-frame (RFT) apparatus. The research assistant (on the left) rotated the rod per the participant's verbal instructions until the participant estimated the rod to be vertical with respect to gravity. The participant (on the right) sat on a backless chair with a curtain over his or her head and viewed a tilted rod that appeared at the end of a tilted frame. (Bottom) Participant view from inside the RFT apparatus. In this particular trial, the rod is initially placed at –18 deg and the frame set is at +18 deg away from vertical. Participants also completed the following trials: rod +18 deg and frame +18 deg, rod – 18 deg and frame –18 deg, and rod +18 deg and frame –18 deg, for a total of four trials