A method of administering an effective amount of (R)-7-chloro-N-(quinuclidin-3-yl)benzo[b]thiophene-2-carboxamide, or a pharmaceutically acceptable salt thereof, to a patient in need thereof. One embodiment of the invention provides a method of maintaining, treating, curing and/or improving at least one cognitive function in a patient in need thereof, comprising: administering to the patient, for an extended period, an effective dose of (R)-7-chloro-N-(quinuclidin-3-yl)benzo[b]thiophene-2-carboxamide, or a pharmaceutically acceptable salt thereof.
