A high throughput neurophysiological assay for identifying anti-psychotic compounds is disclosed. In particular, a high throughput neurophysiological assay using information obtained from injecting a neural activity blocker, such as tetrodotoxin (TTX), into one hippocampus persistently coactivated pyramidal cells in the uninjected hippocampus that initially discharged independently. In accord with the definition of cognitive disorganization, pyramidal cell firing rates only changed for 15 min and did not accompany the coactivation. The disclosed assay uses the TTX-induced coactivity of hippocampal pyramidal cell discharge to identify compounds that may prevent or attenuate the changes in the hippocampal pyramidal cell discharge observed when a neural activity blocker is administered. The assays of the invention are useful for high throughput screening of targets in the discovery of drugs that have anti-psychotic properties. Also disclosed is a method of inducing and measuring neural activity normally associated with a psychotic state.