Loss of the ability to form new memories beyond a certain point in time. This condition may be organic or psychogenic in origin. Organically induced anterograde amnesia may follow craniocerebral trauma; seizures; anoxia; and other conditions which adversely affect neural structures associated with memory formation (e.g., the hippocampus; FORNIX (brain); MAMMILLARY BODIES; and anterior thalamic nuclei). (From memory 1997 Jan-Mar;5(1-2):49-71)