Providing for access point assisted signal acquisition for heterogeneous access point wireless networks is described herein. The flexible band 10 includes water absorbent uniaxial stretchable sweat band 20 and a logo 40 to be displayed attached to an inflexible band 30. , in a subject suffering from a psychiatric disorder, such as schizophrenia. Preferably a cascode based op amp structure is implemented. A light-transmitting area 14 is formed between the pair of luminous flux outputting devices 9a, 9b, 9c, 9d so as to transmit therethrough interference light from an object surface.