Neurofeedback (NF) used at rest could serve as a mean to explore the connection between resting state connectivity, task-related connectivity, and task performance. Evidence shows greater M1-PMd connectivity is associated with superior performance in action selection (AS). However, the causal relationship has not been thoroughly examined. Therefore, this study aimed to determine if M1-PMd connectivity could be modulated through covert fMRI-NF during rest, subsequently affecting cognitive-motor connectivity and behaviour. 20 adults took part in this counterbalanced within-subject double-blind study. Participants were trained covertly on 3T fMRI-NF in two separate conditions, one moth apart: increase and decrease M1-PMd connectivity. The NF training consisted of three runs in each condition, and participants were given a monetary reward at the end of each run depending on their performance. No main effect of condition, NF run, nor order was found (Fig. A). Only an interaction between order and run was found to be significant (F(2,34) = 3.80, p=0.03), indicating there is a practice effect suggesting that more sessions might have been beneficial (Fig. B). No significant changes were induced on neither AS-related connectivity nor AS performance. A positive correlation between reward sensitivity and NF performance in the decrease condition was found. We conclude that due to potential ceiling effects, more training might have been necessary to make to desired link between rest connectivity, task connectivity and task performance. This study, however, brings key insight into NF success variability.