the brain to create a single perceptual experience or response. Recent cue recruitment experiments have shown that the adult human visual system can learn to utilize new cues through classical (Pavlovian) conditioning. Visual cues Visual cues are sensory cues received by the eye in the form of light and processed by the visual system during visual perception. Since the visual system is dominant in many species, especially humans, visual cues are a large source of information in how the world is perceived. Types of cues Depth The ability to perceive the world in three dimensions and estimate the size and distance to an object depends heavily on depth cues. The two major depth cues, stereopsis and motion parallax, both rely on parallax which is the difference between the perceived position of an object given two different viewpoints. In stereopsis the distance between the eyes is the source of the two different viewpoints, resulting in a Binocular disparity. Motion parallax relies head and body movement to produce the necessary viewpoints. Motion The visual system can detect motion both using a simple mechanism based on information from multiple clusters of neurons as well as by aggregate through by integrating multiple cues including contrast, form, and texture. One major source of visual information when determining self-motion is optic flow. Optic flow not only indicates whether an agent is moving but in which direction and at what relative speed. Biological motion Humans in particular have evolved a particularly keen ability to detect if motion is being generated by biological sources, even with point light displays where dots represent the joints of an animal. Recent research suggests that this mechanism can also reveal the gender, emotional state, and action of a given human light point model. Color The ability to distinguish between colors allows an organism to quickly and easily recognize danger since many brightly colored plants and animals pose some kind of threat, usually harboring some kind of toxin. Color also serves as an inferential cue that can prime both the motor action and interpretation of a persuasive message. Contrast Contrast, or the difference in luminance and/or color that helps make an object distinguishable, is important in edge detection and serves as a cue. Auditory cues An auditory cue is a sound signal that represents an incoming sign received through the ears, causing the brain to hear. The results of receiving and processing these