The Heavenator said:
Probably a little something known as the Bystander effect [http://en.wikipedia.org/wiki/Bystander_effect].
After watching the video, I have to disagree. The bystander effect doesn't usually make people walk on nonchalantly. People still recognise something has happened, they usually just don't react in a helpful manner.
The driver actually drove off, and the second driver drove over her again. Then people walked right past her, barely even noticing. If you watch footage of the bystander effect in action, it's usually most noticable in larger crowds of people and they are all aware that something is happening. And usually have normal reactions to it, i.e. showing shock or disgust via their facial expression. Even if they don't do anything to help.
I've actually been in part of a situation with the bystander effect. It was when I was a lot younger, but I still remember it really clearly.
We were coming back from a martial arts ceremony, I must have been about 12, maybe slightly younger. We were at the traffic lights and an old man fell to the floor on the pavement. He was clearly struggling and couldn't get up. Everyone just froze in their seats and didn't so much as a speak. It must have been about 5 minutes before someone got out of their car to help. And I remember her shouting at other people for not helping.
But that was just it, it took her 5 minutes to react. No one did anything because it's just expected that someone will do something. People are still effected by the incident, there's just some expectation that we don't have to do anything ourselves because someone else will.
The reason I didn't do anything is because my parents weren't doing anything. At that point in my life, I looked to them to model my behaviour in situations I was unfamiliar with.
Now, I know I'd get involved. Because I've gotten out of a car to help someone who was having an epileptic fit. Similar situation again, I was in a car that pulled up to some lights and I saw someone fall down and begin seizing. Only this time I got straight out of the car and put my hoody under their head to cushion it and called an ambulance. And I know the reason I got out so quickly was because as a child I saw a similar situation where no one reacted for a large amount of time because they expected someone else to do it and those 5 minutes have always stuck with me.
What I saw in that video doesn't look at all like the bystander effect. It's almost as if they hadn't registered that something had happened. Which is really weird.