across different age groups, and several studies have been done using Navon-like figures to examine the correlation between precedence and age. Children and Adolescents When presented with a global-local task, children and adolescents exemplify a local bias. Younger children respond slower to different types of stimuli compared to older children, and thus local precedence seems more prevalent than global precedence in perceptual organization, at least until adolescence, when the transition to globally oriented visual perception begins. The ability to encode a global shape, which is necessary for efficiently recognizing and identifying objects, increases with age. However, it has also been found that there is a bias towards global information during infancy, which may be based upon high spatial frequency information, as well as limited vision. Therefore, global precedence during the early years of life may not be upwards but rather a U-shaped development. Aging There is a decline of global precedence in older subjects. When presented with a Navon-like figure, young adults demonstrate global precedence enhancement in that when the number of local letters forming the global letter increases, their global precedence increases. On the other hand, there is no precedence effect or enhancement for older subjects when presented with the same task. This links global precedence to the Gestalt principles of Proximity and Continuity, and suggests that Gestalt-related deficiencies, such as decline in perceptual grouping, may underlie the decline of global precedence in older subjects. Global precedence decline may also relate to hemispheric specialization. The spatial frequency theory proposes that global versus local information is processed through two “channels” of low (global) versus high (local) spatial frequencies. spatial frequency measures how often a stimulus moves through space. Based upon this theory, the double frequency theory links the left hemisphere with high spatial frequencies, leading to a global precedence effect, and the right hemisphere with low spatial frequencies, leading to a local precedence effect. This suggests neuropsychological factors behind global precedence decline in there may be faster aging in the right than the left hemisphere. Affect Studies regarding mood have shown that positive and negative cues can influence global versus local attention during image-based tasks. Self-generated emotional primes Some studies have shown that positive priming decreases local response time, demonstrating a lessening effect of global precedence, while negative priming increases local response time. Mood dictates one's preferences for processing type. The result that negative priming reduces flexibility correlates to the