Precision Neuroscience claims to have set a new record for the number of neuron-tapping electrodes placed on a living human's brain at 4,096. The high density of electrodes allowed neuroscientists to map the activity of neurons at an unprecedented resolution during a surgery to remove a benign brain tumor. Precision's device sits on top of the brain and does not penetrate the brain at all. It consists of a film that contains 1,024 electrodes embedded in a lattice pattern. The device is modular, allowing for multiple films to be used at once - four devices were used during the surgery.