Introduction. The role of affective states on the creative process has been receiving the attention of researchers and has led to contradictory results. Most research in creativity has emphasized the role of affective states, mainly positive ones, on creativity levels, namely those resulting from divergent thinking tasks that reveal the unconventional way of thinking in the creative process. However, there are nostudies to date that focus on the impact of affective states on conventional and unconventional thinking, during the same creative process, which consider a singlecreative assessment task. The aim of this experimental study was to analyze the effect of induced affective states on both conventional and unconventional thinkingof creativity in adults by using the TCT-DP (Test for Creative Thinking-Drawing Production). Method. Seventy-five university students, mostly female, with a meanage of 26.95 years, were randomly assigned into three affect elicitation conditions (pleasant vs. unpleasant vs. neutral). Results. Results indicated that the negativeaffective state led to higher levels of conventional thinking when compared to positive and neutral affective states. However, no significant differences were foundon unconventional thinking across the three conditions. Conclusions. Our results do not support the assumption that the negative affect has a hindering effect oncreativity nor the positive affect increases creativity. Negative affect seems to promote conventional thinking, perhaps due to its cognitive correlates, which canbe manifested in focusing attention and analytic thinking. Practical and theoretical implications for future research on the role of affective states on creativity are discussed