An image forming apparatus and a method of controlling the image forming apparatus are provided. In an example embodiment, a first device emits a first acoustic signal and then receives the first acoustic signal at a first time. Hooks are formed on the bottom plate. This invention presents a reliable, inexpensive, easy-to-handle and non-invasive method for sensitive screening of dementia and monitoring progress of dementia which also allows optimizing medication and treatment for dementia. The advisor rating system processor then compares the advisors based on these scores and generates a report indicating to which financial advisors a company should market financial products. The face of the rotation body is perpendicular to the rotation shaft of the rotation body and the sensor chip is provided so as to face the magnetic part for detecting a variation of magnetic field by the magneto-resistive element when the magnetic part is rotated with the rotation body.