A cat-ear power supply is operable to generate a DC voltage and draws current from an AC power source near the beginning and end of a half-cycle of the AC power source. The methods safely and effectively provide and maintain drug infusions that do not push the patient into unconsciousness andor general anesthesia. In some embodiments, the PSD may be incorporated into a wearable article, such as gloves, eyewear and the like, or used for skin surface measurements. A reward to consolidate progress in training and make it habitual is provided, the reward being presented by generating a high-pitch intonation message of gratitude and by a treat. The grip area has a non-circular shape. After the elastic contact body is bonded to the membrane circuit board by an adhesive, the press force of the elastic contact body caused by pressing the key can be released via the holes.