Houma police, worried that the deaths of five men in the last 2 1/2 years may be the work of a serial killer, have asked the FBI for help in their investigation, a spokesman said Tuesday.'The FBI's been called in to assist us with this and with using computer databases and profiling capabilities,' Lt. When they carry out their crimes, the locational choices are affected by reliable knowledge of the city or area which forms wedge shaped images that are shape in focus for places close to home or other parts of the home sector, and blurry or blank for distant places, such as the other side of town. To be sure, there is ample basis for the argument that criminals’ spatial patterns depend on limited mental maps or mental images of the city and areas surrounding their homes. In another study on directional bias, Mercer suggests that the sectoral mental map may not be anchored on downtown, based on regular daily activities, but may instead focus upon recreation areas beyond the city which are visited weekly. Johnston found, for example, that choice of location for affluent citizens was influenced by a directional factor of availability of land on which to build. The theory of directional bias is also supported by Johnston’s 19 research in Christchurch, New Zealand.

Porteous referred to these peripheral areas as orbit areas. The offender’s mental image is built up from repeated journeys to work, and the suburbs on the city fringe develop by visits to peripheral urban shopping centers. The reason for the directional bias is to due to the fact that human beings invest the landscapes they experience with symbolic value.

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