 PROCEDURE NHS Tayside Adult Psychological Therapies Service receives electronic referrals, usually from the GP, stating the reason for referral. The patients symptomsdiagnoses and CHI number are then documented in a diary waiting to be allocated to the next available appointment. The clinicians will look through the diary, noting the ones who appear to meet the relevant diagnosissymptoms to ensure that they will be seen by an EMDR qualified clinician if they choose to be seen by psychology at all. Patients who appear to meet the initial criteria, will be sent a standard protocol appointment letter, stating that they must contact the service within 2 weeks if they still wish to be seen by psychology. Those who choose to be seen will be provided with an initial assessment session, where information is gathered about their presenting problems and history. They will also be asked to complete routine questionnaires. This will be completed by the EMDR qualified clinician, who at the same time will offer them to take part in the study if they believe the patient is suitable for EMDR. If the therapist believes the patient is not suitable for EMDR then as part of standard protocol the assessment will be completed and the patient will be allocated to the next available clinician for treatment. If the patient is suitable then the clinician will explain the parameters of the study which will include, digitally measuring arousal levels and video recording the patients face during their first two treatment sessions of EMDR therapy with the assessing clinician. Also at their first session the clinician will show the equipment that will be used and provide them with a participant information letter about the study for them to take away and think about. Within the information letter they will be informed that choosing not to take part will not affect their routine care and even if they choose to take part they can drop out at any time and continue with treatment as usual. The chief investigators contact details will also be provided, should they require further information. At the end of the letter they will be provided with 2 options: 1. I agree to take part in the study. 2. I do not wish to take part in the study. They will need to contact the service within 5 days of their first session to inform us of their decision. This is to allow the equipment to be set up in advance if they agree to take part. Regardless of whether they decide to take part in the study or not, their next session will be within 2 weeks of the initial assessment, which will be with the same clinician if they take part, but may be a different clinician of they do not take part, which is within standard service protocol. 