Study of emotion and arithmetic

Has any one else completed this survey today? the Photos within it were extremely graphic and upsetting. in the explanation at the start of the study it mentioned the images would be of different types including some with a pistol but nothing to indicate the dreadful nature of some of them. I am pretty sure I would have noticed if it had said graphic images of beatings, decapitated bodies etc. I have reported this to Prolific.

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I messaged the researcher and said he should warn participants and his response was

Sorry for this. I indicate this before the experiment