Abstract: An implant device provides context switching, meaning the ability to change one set of operational parameters for another. The implant device is controlled by a set of operational parameters. The patient may swap the current set of operational parameters with another set of operational parameters. Further, the implant device may include a time-of-day clock, and/or a sensor, and is configured to automatically change its operational parameters from one set of operational parameters to another at certain times of the day, week, or month, or upon the occurrence of certain prescribed events. In one embodiment, the patient may define selected operational parameters within a new set of operational parameters for use with the implant device, providing such patient-defined parameters remain within set limits. The ability to change the current operational parameter set (OPS) is achieved, in a first embodiment, by including memory circuitry within the implant device wherein a plurality of OPS's are stored.