temperature, texture, pressure, proprioception, and pain. The signals vary for each of these perceptions, and the receptor systems reflect this: thermoreceptors, mechanoreceptors, nociceptors, and chemoreceptors. Haptic cues in research The interaction between haptic and visual cues In addition to the interplay of haptic communication and nonverbal communication, haptic cues as primers have been looked at as a means of decreasing reaction time for identifying a visual stimulus. Subjects were placed in a chair fitted with a back which provided haptic cues indicating where the stimulus would appear on a screen. Valid haptic cues significantly decreased reaction time while invalid cues increased reaction time. Use in technology for the visually impaired Haptic cues are used frequently to allow those who have impaired vision to have access to a greater wealth of information. Braille is a tactile written language which is read via touch, brushing the fingers over the raised patterns. Braille technology is the attempt to extend Braille to digital media and developing new tools to aid in the reading of web pages and other electronic devices often involves a combination of haptic and auditory cues. A major issue that different technologies in this area attempt to overcome is sensory overload. The amount of information that can be quickly related via touch is less than that of vision and is limited by current technology. As a result, multi-modal approaches, converting the visual information into both haptic and auditory outputs, often have the best results. For example, an electronic pen can be drawn across a tablet mapped to the screen and produce different vibrations and sounds depending on what is at that location. Olfactory cues An olfactory cue is a chemical signal received by the olfactory system that represents an incoming signal received through the nose. This allows humans and animals to smell the chemical signal given off by a physical object. Olfactory cues are extremely important for sexual reproduction, as they trigger mating behavior in many species, as well as maternal bonding and survival techniques such as detecting spoiled food. The results of receiving and processing this information is known as the sense of smell. Olfactory system The process of smelling begins when chemical molecules enter the nose and reach the olfactory mucosa, a dime-sized region located in the nasal cavity that contains olfactory receptor neurons. There are 350 types of olfactory receptors, each sensitive to a narrow range of odorants.