“…Although deliberate (instructed) generation of standardized imagery scenes may allow a more controlled investigation of the impact of imagery generation on factors such as mood (e.g., ), decision-making (e.g., Gaesser & Schacter, 2014), or behaviour (e.g., Pictet et al, 2011Renner et al, 2019), we need to be cautious about extrapolating from this to involuntary, spontaneously occurring imagery, particularly as there is some evidence that involuntary mental imagery may differ in its emotional impact and other phenomenological characteristics compared to its voluntarily generated counterparts (e.g., Barsics et al, 2016;Berntsen & Hall, 2004;Cole et al, 2016), and this is a matter of ongoing debate (e.g., Barzykowski et al, 2019;Barzykowski & Niedźwieńska, 2018;Barzykowski & Staugaard, 2016Schlagman & Kvavilashvili, 2008). In fact aside from participants' subjective reports (e.g., Barsics et al, 2016;D'Argembeau et al, 2011;Duffy & Cole, 2020;Rasmussen & Berntsen, 2013) we have very little, if any, direct evidence as to the functions and impact PREPRINT OF UNPUBLISHED MANUSCRIPT: see https://osf.io/whk2b/ v4.0 02. 07.20 of what seems to be one of the most commonly-experienced forms of mental imagery.…”