Although many people feel that expectations for personal space (usually about 18 inches for americans) are innate, members of many cultures are used to noticeably lesspersonal space than we are, which to demonstrate that our expectations for personal space are: a. the direct result of hormonal differences in the limbic systemb. usually negotiable and not all that hard to changec. a part of our culture and as such are learned, rather than innated. very difficult to measure accurately