You need to learn some neuroscience buddy. One neuron is not one bit. A neuron works in much complex way than a single bit in a computer. A neuron has hundreds to thousands axons and dendrites and connect with other neurons in a dense network. I am surprised by your knowledge of neuroscience yet attacking me. very strange.

EDIT: As dragonwriter says below, lower levels of neural networks are responsible for general facial recognition but that triggers more specific neurons once the recognition is done from generic face -> specific person. Even in artificial neural networks single bit is sufficient at the end of the classification.