What is evidence that the boys' lives focus 'inwards' only, ignoring the outside almost exclusively?I honestly don't understand what this is...

Do you think the question is asking about Simon or Ralph
or Piggy?  Each of these boys spends a lot of time "thinking."  Even Jack thinks quite a
bit, although his thinking SEEMS to be focused on only hunting the pig. Try to find
places where Ralph and Piggy talk.  You will see that Ralph starts to lose his ability
to think and focus, but Piggy is a clear thinker all the way through.  Don't forget to
re-read the parts about Simon. He is totally "inward?"  Definitely look at the part
where he talks to the pig's head and it seems like the pig answers him.  Do you think
that really happened or is it part of Simon's imagination?