Implicit cognitive processes such as approach and avoidance (AA) are fundamental in understanding the mechanisms sustaining repetitive self-harm in young people. However, AA biases have not yet been characterized in this population. The present dissertation investigates the feasibility of assessing approach-avoidance biases in a pilot sample of young people who self-harm before completing the full sample (n=100) and associate them to mental imagery and motivation to regulate self-harm behaviour. It was hypothesised that people who self-harm (SH) would show an automatic avoidance bias to self-harm stimuli to a greater extent than healthy controls (HCs), while those who also experience positive emotions from self-harm related mental imagery would show an automatic approach bias to the same stimuli. We examined AA tendencies in a community sample of individuals aged 16-25, who were allocated to the HC group (n=10) and the SH group (n=4). Using a computerized feedback-joystick task with displays of pictures of hobbies (positive), neutral images, and pictures of self-harm, we recorded reaction times (RTs) as our primary research outcome. In comparison with control and positive stimuli, self-harm stimuli seem to elicit an automatic avoidance bias in both HCs and SH participants, with a potential higher intensity in the SH group. Present findings from this pilot sample shows a trend that could be in the direction of our hypothesis, although we are unable to confirm it due to the very small sample size as of now. Confirmation of these findings in the full sample of participants is imperative, and further investigations could be required to better understand the role of mental imagery and implicit AA and help develop more effective interventions for young people with repetitive self-harm.