01375nas a2200181   4500000000100000008004100001260001400042100001700056700001800073700001800091700002700109245009500136856005800231300001100289490000600300520087300306022001401179       2021                            d  c2021-4-201 aHanna Mamzer1 aAgnieszka Zok1 aPiotr Białas1 aMirosław Andrusiewicz00aNegative psychological aspects of working with experimental animals in scientific research  uhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC8063873/  ae110350 v93 aThe aim of the study was to reveal the negative psychological aspects of using animals by scientists and to determine whether the emotional tensions and stress are associated with performing experiments on animals. All 150 participants of the study conduct experiments on animals in their work. Computer-assisted web interviewing, was used to collect the data. Correlation matrices for factorial analysis of main component loads and cluster analysis have been calculated as grouping methods revealed two different categories of researchers, which were mostly distinguished by acceptance and aversion to animal testing and animal welfare. The main findings demonstrated, that there is a group of respondents who feel discomfort when performing experiments on animals. Especially young people involved in animal testing, feel remorse, emotional tension and helplessness.  a2167-8359