The treatment of anxiety and depressive symptoms after acquired brain injury.

In order to be eligible to participate in this study, a subject must meet all of the following criteria:
- having sustained any type of stroke or traumatic brain injury which is objectified by a neurologist;
- the depression subscale of the Hospital Anxiety and Depression Scale (HADS) is above 7 and/or the anxiety subscale of the HADS is above 7;
- being 18 years or older;
- stable use of medication (such as antidepressants) for the duration of the study and use of antidepressants should be stable four weeks prior to the beginning of the study;
- access to the internet and a computer because treatment materials such as patient videos are shown via the internet;
- the Dutch language, cognitive and communicative skills are sufficient to benefit from treatment based on clinical judgement; and
- giving informed consent.

A potential subject who meets any of the following criteria will be excluded from participation in this study:
- history of brain injury or disease (objectified by neurologist and classified as moderate or severe) or any neurological disorder (such as: idiopathic epilepsy, brain tumor, meningioma, multiple sclerosis, Huntington’s disease, Parkinson’s disease, meningitis, or encephalitis) other than a stroke and traumatic brain injury;
- pre-morbid disability as assessed with the Barthel Index (score<19/20);
- severe co-morbidity that might affect outcome (e.g., cancer or major psychiatric illnesses for which treatment is given at the moment of inclusion);
- ongoing mood and/or anxiety disorder based on the DSM 5 for which pharmacological and/or psychological treatment was necessary during the onset of the brain injury;
- attendance in a previous ACT intervention for comparable problems in the year proceeding entry in the current study.