In assistive technology, which of the following is a key element of spatial characteristics?

The correct choice emphasizes the importance of the number of targets in assistive technology when considering spatial characteristics. In the context of assistive technology, spatial characteristics refer to how technology interacts with the user's environment and the specific spatial elements that affect usability.

Having an adequate number of targets is crucial because it pertains to the accessibility and functionality of devices designed for users with disabilities. For example, in the case of an adapted communication device, the arrangement and number of buttons or icons available can greatly influence how easily a user can access and interact with the device. If there are too few targets, it may limit the user's ability to convey messages effectively, while too many can lead to confusion or difficulty in selection, especially for those with cognitive or physical limitations.

In contrast, factors like the price of the device, user age range, and brand reputation, while important in other contexts, do not directly relate to the spatial characteristics that affect how a user interacts with the assistive technology in their environment. Price may influence access and selection, user age can inform design considerations, and brand reputation may impact trust and market share, but none of these elements address the spatial interactions that are essential for effective assistive technology use.