I hate to break it to you, but there isn't much to say that hasn't been already explained... in life.
God spoke through methods which we now have logical explainations for that those in bliblical times did not: earthquakes, volcanos, lightening strikes, the tides of the sea. Also hallucinations from various illnesses we now have names for (I had SERIOUS hallucinations from dengue fever) or from simple malnutrician, dehydration, food or other poison, allergies, or having a restless night simply because of an upset stomach (I have wicked dreams if I eat pizza as a late dinner, for example), sunstroke from working the fields/hearding too long without shade/water, etc. We have diseases from other lands that are foreign or diseases taken to other lands ("curses" in the bible). We also have mental illness which, if you notice phychology and mental health is not covered in the bible AT ALL... so things like schizophrenia and bipolar disorder would have had no context for them.
Plus, if you look it up, people hear voices for all kinds of normal reasons. Hypnagogiac and hypnopompic hallucinations are something we've all exprienced, a lack of food (low blood sugar) or fasting, accidental sleep depervation, abuse or bullying, trauma, shock, etc.
If we were removed from out phones, tvs, laptops, family, etc. and listened to our bodies and the world around us without so much DISTRACTION... we would find MANY MANY ways in which a person in bible times would have reason to believe they were being talked to by the divine. We have explainations for all of them so we do not think in those terms anymore. You can't think in 2013 format about life as it was in bible times and wonder why 'god' stopped talking. We are very VERY different people, and we understand A LOT more about who we are... even down to the crazy man smearing shit on his face. No, he's not a phophet... he's just narcissistic with bipolar disorder. Nothing more.