Can Betta fish sense if another of its kind died somewhere in the tank?

Bettas are not the most active fish. When they do get active, they need about 20 inches to get a good running start. If you tank is smaller than a 10 gallon, he just does not have the room to get active. Raising the temperature is one way to increase activity in fish, if the spot he has is the most defensible spot in the tank - at least in his mind, he is going to stay in place. More plants will encourage him to look around some more. What is in the rest of the tank? 380 gallons is a huge tank for just a betta.