Reductive versions of physicalism are increasingly unpopular as they do not account for mental lives. The brain on this position as a physical substance has only physical attributes such as a particular volume, a particular mass, a particular density, a particular location, a particular shape, and so on. However, the brain on this position does not have any mental attributes. The brain is not overjoyed or unhappy. The brain is not in pain. When a person's back aches and he or she is in pain, it is not the brain that is suffering even though the brain is associated with the neural circuitry that provides the experience of pain. Reductive physicalism therefore cannot explain mental lives. In the event of fear, for example, doubtlessly there is neural activity that is corresponding with the experience of fear. However, the brain itself is not fearful. Fear cannot be reduced to a physical brain state even though it is corresponding with neural activity in the brain. For this reason, reductive physicalism is argued to be indefensible as it cannot be reconciled with mental experience.