Fig. 2
(a–e) Results of skin conductance responses (SCR) from the first study, with the upper line showing line plots over binned trials, and in the lower line, bar plots of responses taken from trials highlighted in grey. Most importantly, we see in the bar plot below (e) that the two experimental deepened extinction conditions (fear + fear and reward + fear) prevent return of fear, whereas the conventional single fear extinction condition and control deepened extinction conditions does not. (f) Scatterplots showing the relationship between SCR differences for deepened and conventional single fear extinction cues in reinstatement, and the same SCR differences in deepened extinction. The scatterplots demonstrate a link between deepened extinction and return of fear in reinstatement, only for the two conditions (fear + fear and reward + fear) that were effective in preventing return of fear (*p < 0.05, **p < 0.01).
