Previous breast surgery, both ipsilateral and contralateral.

Stage III-IV breast cancer.

Chronic pain (\>3months) with an average severity of at least a VAS score 4 during the last two weeks.

Chronic pain for which invasive treatment is needed.

Use of (weak / strong) opioids in the last week.

A history of opioid addiction.

Regular use of the following medications in the last year:

antiepileptics,antipsychotics and anxiolytics.

ASA 3 or higher.

Consumption of alcohol (\>4 units) and / or drugs the evening before.

Alcohol consumption (\>= 5 units/day).

Illiteracy, problems with self expression, language barrier.

Serious vision and / or hearing problems, interfering the performance of the experimental tasks.

A history of psychiatric complaints and/or epilepsy .

A medical history of CVA or TIA.

Prediction of Pain After Breast Cancer Surgery With EEG