Neuroimaging studies have confirmed that when users hug a torso sex doll that simulates the body temperature of an elderly person (35.8°C), the activity of the prefrontal cortex increases by 19%, which is highly similar to the brain activation pattern during parent-child interaction. A Swiss manufacturer has launched a "memory remodeling" function for this purpose. The granny sex doll can tell a preset family story through a voice module and simulate the heartbeat rhythm with chest vibration. This design that implants psychological principles into the torso sex doll is blurring the legal boundaries between therapeutic equipment and adult products.