1. Tokyo Dental Junior College Chiyoda‐ku Tokyo Japan
2. Division of Sensory Physiology and Medical Application Sensing, Research and Development Centre for Five‐Sense Devices Kyushu University Fukuoka Japan
3. Section of Oral Neuroscience Graduate School of Dental Sciences Kyushu University Fukuoka Japan
4. Department of Oral Physiology Graduate School of Medicine, Dentistry and Pharmaceutical Sciences Okayama University Okayama Japan
5. Monell Chemical Senses Centre Philadelphia PA USA