Helmet-mounted displays (HMDs) are designed as a tool to increase performance. To achieve this, there must be an
accurate transfer of information from the HMD to the user. Ideally, an HMD would be designed to accommodate the
abilities and limitations of users' cognitive processes. It is not enough for the information (whether visual, auditory, or
tactual) to be displayed; the information must be perceived, attended, remembered, and organized in a way that guides
appropriate decision-making, judgment, and action. Following a general overview, specific subtopics of cognition,
including perception, attention, memory, knowledge, decision-making, and problem solving are explored within the
context of HMDs.