There are many processes that occur in the frontal regions that are important for source-monitoring; these include circuits linked with the hippocampus that encourage feature binding and structures that play a role in strategic retrieval. The left hemisphere of the prefrontal cortex is involved in systematic judgments and the right hemisphere of the prefrontal cortex is involved in heuristic judgments. Processes which promote the binding or clustering of features, both physically and cognitively during encoding and retrieval, are important to source memory. Development and Aging Many experiments have been done in an attempt to find whether source-monitoring errors are more prevalent in a particular age group; they are most prevalent in elderly individuals and young children. It has been proposed that source-monitoring errors are common in young children because they have difficulties with differentiating real and imaginary ideas, confirming that young children have difficulties in aspects of reality monitoring. With regards to eyewitness testimony, elderly individuals are more likely to make errors in identifying the source of a memory, making them more susceptible to misleading information. Reality monitoring may often lead to source-monitoring errors because a memory may not be typical of its original class. For example, if an internal memory contains a large amount of sensory information, it may be incorrectly recalled as externally retrieved. However, older adults do not always exhibit source-monitoring errors, such as when encoded material are visually distinctive as is the case with pictures compared to words. Older adults appear to be unable to expend additional neural resources in the prefrontal cortex in conditions associated with greater demands, thus increasing source-monitoring errors for non-distinctive materials. One exception is older adults with higher cognitive reserve, who may be able to maintain processing resources for longer periods of time and reduce source-monitoring errors compared with older adults with lower cognitive reserve. Related phenomena Old-new recognition Old-new recognition is a measurement method used to assess recognition memory. The process is that a participant indicates if an item is new by responding "no" and vice versa. Errors can occur in this form of recognition in a similar fashion to how they occur in source-monitoring; errors occur more frequently when objects are very similar, when circumstances of the situation make information retrieval difficult (like distractions or stress), or when the judgment processes are impaired in some way. The heuristic and systematic judgment process in particular are suspected to be the