Being able to convey emotion with tone in speech likely adds a lot more "information".
As well, the 'amount of information' conveyed depends on the environment, and the preparation of the speaker and the listener. Some speakers (not to mention any names) spew a lot of BS ( not information) to sort through.
I'd argue that, in a medical environment, the word 'sponge' conveys less information than the word 'ebola'.
For the prepared, the cascade of necessary reactions in the brain can take little or much time to process. Some authors/speakers (authoritative) can pack -a lot to think about- in a few words. Like 'Where is everybody?'