Inclusion Criteria:

- Aged 5-13 years at first assessment (All groups)

- Newly diagnosed brain tumour patients that have not yet received adjuvant therapy (BT
patients only)

- Stable medical condition (BT and CF patients only)

Exclusion Criteria:

- Diagnosed with a disorder of the autistic spectrum (Autism, Asperger's Syndrome or
Pervasive Developmental Disorder not otherwise specified - All groups) that does not
seem to be related to the tumour (BT patients only).

- History of other brain disease or neurological condition interfering with normal
development (All groups).

- No native Dutch speaker (All groups)

- Severe sensory handicaps and/or behavioural problems interfering with reliable
neuropsychological assessment (All groups)

- IQ below 70 (All groups)

- Poor prognosis and life expectancy less than 1 year (BT patients only)