The four experiments performed by Bhalla, M., & Proffitt, D. R. (1999) addressed two main research ideas. The first idea was focused on demonstrating that changes in physiological potential in a variety of contexts affect the conscious awareness of slant. The first 3 experiments showed that conscious slant overestimation is increased by the reduction in physiological potential as a result of (1) carrying a heavy load, (2) becoming fatigued by running, (3) being less physically fit, (4) and/or being elderly or in poor health. Visually guided actions, however, are unaffected by these conditions. The second idea was measuring the time course for the recalibration of the transformation. This involved relating (1) conscious awareness and the (2)
