The thalamus is a complex structure that contains many different subnuclei with distinct functions. It is responsible for relaying sensory information to the cerebral cortex as well as the programming of motor control, memory, and attention. Recent studies have investigated the role of the thalamus in schizophrenia and have found that structural abnormalities in the thalamus are present in adolescents who have had psychotic experiences, even if they do not meet the diagnostic criteria for a psychotic disorder. This suggests that the thalamus may play a role in the early stages of psychosis development and highlights the importance of studying this brain region in at-risk populations. Advances in neuroimaging techniques such as magnetic resonance imaging (MRI) have made it possible to study the thalamus in more detail. This can provide valuable insights into the underlying mechanisms involved in the relationship between the thalamus and psychosis. The aim of this project is to discover potential variations in thalamic nuclear volume between patients with a history of psychotic experiences and healthy controls. Adolescents who had reported psychotic experiences and healthy controls were recruited as part of the Adolescent Brain Development (ABD) programme. All participants underwent diffusion weighted magnetic resonance imaging (DW-MRI) and were followed up for subsequent imaging over three distinct timepoints. Using a digital dissection tool, FreeSurfer v6.0, the overall thalamic structure and each of the thalamic subnuclei were isolated for each scan. By gaining a better understanding of the thalamus’s role in psychosis, we may be able to develop more effective treatments for this condition. The potential for targeted interventions that specifically modulate the activity of thalamic subnuclei provides hope for the development of new treatments for psychosis.