Feasibility/Acceptability of Attentional-Control Training in Survivors

Inclusion Criteria:

* Aged 8-16 years at time of screening.
* History of diagnosis of acute lymphoblastic leukemia (ALL) or brain tumor (BT).
* At least 1 year from completion of planned therapy and stable from a disease standpoint.
* Participating child and caregiver are fluent in spoken English.
* Availability of a caregiver who is willing and capable of providing support and supervision during cognitive training.
* Participating child is either not taking any prescribed stimulant medication for attention difficulties or has been prescribed a stable dose of stimulant medication for attention difficulties for at least 30 days prior to enrollment.
* Only patients with a T-score ≥ 75th percentile on the CPT-3 Omission Errors scale or on the BRIEF-2 Cognitive Regulation Index will be randomized.

Exclusion Criteria:

* A history of photosensitive seizures.
* A motor, visual, or auditory handicap that prevents computer use.
* A mental health condition that precludes, or takes treatment precedence over, participation in the cognitive training.
* Participants identified during the baseline assessment as having a full-scale IQ \< 80, as estimated by WASI-II (Vocabulary and Matrix Reasoning), will not be randomized.