Sensory Modalities

                                         http://en.wikipedia.org/wiki/Sensory_modalities

"Humans are able to see an array of colours because light in the visible spectrum is made up of different wavelengths (from 380 to 760 nm). Our ability to see in colour is due to three different cone cells in the retina, containing three different photopigments. The three cones are each specialized to best pick up a certain wavelength (420, 530 and 560 nm or roughly the colours blue, green and red). The brain is able to distinguish the wavelength and colour in the field of vision by figuring out which cone has been stimulated. The physical dimensions of colour include wavelength, intensity and purity while the related perceptual dimensions include hue, brightnessand saturation.

Primates are the only mammals with colour vision.

The Trichromatic theory was proposed in 1802 by Thomas Young. According to Young, the human visual system is able to create any colour through the collection of information from the three cones. The system will put together the information and systematize a new colour based on the amount of each hue that has been detected."

'Audio-visual integration has been studied as a component of multisensory integration, with recent studies examining how the auditory sense affects vision (for a review see Spence, 2007). Many illusions reportedly result from audio-visual interactions (e.g., Hidaka et al., 2009 and Takeshima and Gyoba, 2013). One such illusion is the fission illusion: When a single flash is presented simultaneously with two beeps, the number of flashes is frequently perceived as two (Shams, Kamitani, & Shimojo, 2000; Shams, Kamitani, & Shimojo, 2002). Audio-visual interaction also induces the stream/bounce phenomenon: Two identical visual targets moving across each other can be perceived to either bounce off or stream through each other. A brief sound at the moment the targets coincide biases perception toward bouncing (e.g., Sekuler et al., 1997 and Watanabe and Shimojo, 2001). In this illusion, perception differs depending on whether the brief sound is presented or not in the ambiguous motion stimuli. In contrast to this phenomenon, in the fission illusion, illusory flashes that are not presented physically can be perceived by sounds.'http://www.sciencedirect.com/science/article/pii/S0042698913001880