Estimated parameters of the two parameter model in Session 1.

<p><b>A</b>. The noise parameter <i>σ</i>. The effect of Room manipulation (the difference between Pleasant and Unpleasant population) was significant. <b>B</b>. The bias parameter <i>δ</i>. The effect of Room manipulation (the difference between Pleasant and Unpleasant population) was not significant.</p>