A recent experiment shows that very many people can't bear to be alone with their own thoughts.
So... are we talking days on end in a sensory-deprivation chamber here?
The challenge is: put away your iThings and sit quietly an an ordinary room for 15 minutes.
Fifteen. Smegging. Minutes.
During which time a lot of the subjects resorted to pushing the "shock me" button to relieve the tedium.
Hence the Kipling:
They string a clamorous Magic
To fence their souls from thought
Must be I'm abnormal or sump'n. 'Cause I can certainly keep my mind occupied for way more'n 15 minutes. Or just blank it and relax for a change.
But I've known plenty of people who absolutely must have a TV going in every room of their homes, every minute of every day... or something similar. Nonstop stimulation! I've even encountered some who'd lug ghetto blasters along on backpacking trips.
I think it goes back to the trees, and monkeys living in large, constantly-chattering groups. Little monkey brains still need the chatter, to reassure them that the tribe is still around.