Page 30, Column 2, Paragraph(s) 10, Core Rule Book
Damage, Brain: A unit of damage that requires the Runner to trash one card from his grip at random, and reduces his maximum hand size by one card.

Brain damage is one of the three types of damage that a Runner can suffer. Brain damage requires the Runner to trash one card from grip at random just like meat and net damage, but each point of brain damage the Runner suffers also reduces his/her hand size by one. If the runner takes too much damage, s/he can flatline.

Page 20, Column 2, Paragraph(s) 6, Core Rule Book
Brain Damage: The Runner randomly trashes one card from his grip for each point of brain damage done to him, and his maximum hand size is permanently reduced by one card. The Runner takes a brain damage token to track this.

FAQ 1.0.12Edit

From the FAQ. Also numbers 1.1.21, 1.2.8, 1.3.8, 1.4.8, and 1.5.8

Every point of brain damage gives the Runner a brain damage token.

Page 9, Column 2, Paragraph(s) 2, FAQ
If the Runner takes 4 brain damage from a single source, how many brain damage tokens would he get?
The Runner takes 1 brain damage token for each point of brain damage he suffers, even if it was suffered all at once. The Runner would get 4 tokens to mark the brain damage he has suffered.

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