How does Stieg Larsson use imagery in The Girl Who Kicked the Hornet's Nest?

Imagery:

"Salander was happy. Her heart was pounding hard when she started up the hand-held for the first time in two months and ventured on to the Internet." (Chap. 13, p. 235)

"She remembered the nights when, as a twelve-year-old, she had been strapped down in a stimulus-free room at St Stefan's. Teleborian had come into the room again and again to look at her in the glow of the nightlight." (Chap. 16, p. 285)