Sometimes they circle downwind to get a scent. At closer range they usually make a slow, hesitant approach with their ears cocked forward and their heads and noses raised as they use their senses to identify what you are. Don't take this as an invitation to approach. A bear's personal space shrinks as it's habituated, but it's still there. To crowd it can be dangerous.
Some bears avoid larger more dominant bears by using areas close to human activity.
This increases their risk of conflict with people. Food-conditioned bears may be bold and approach deliberately to get to your food. They can come right into your camp, rip into your tent, or enter a building. Although all bear attacks are rare, grizzly bears are more dangerous to people than black bears. Most serious and fatal grizzly bear attacks are defensive, while such attacks by black bears are typically predatory.