Tinnitus activity in the limbic system and autonomic nervous system, thus increasing tinnitus awareness and annoyance. There are two types of tinnitus: "subjective tinnitus" and "objective tinnitus". Tinnitus is usually subjective, meaning that there is no sound detectable by other means. Subjective tinnitus has also been called "tinnitus aurium", "non-auditory" or "non-vibratory" tinnitus. In very rare cases tinnitus can be heard by someone else using a stethoscope, and in less rare – but still uncommon – cases it can be measured as a spontaneous otoacoustic emission (SOAE) in the ear canal. In such cases it is objective tinnitus, also called "pseudo-tinnitus"
Body part as an object 1963 article, and the results replicated by Overton & Jackson. Their findings suggest younger children were more likely to use BPO pantomimes to create a tangible representation of the object they were pantomiming. Boyatzis & Watson suggests that the decrease in BPO pantomime usage with age is a result of developing symbolic maturity, as older children can use a less concrete representational form. Body part as object errors are defined as the use of BPO pantomimes in place of the IO pantomimes dominant in typical adult individuals. It has been debated whether the existence of BPO errors can be used