To accomplish the primary functions of the nervous system there are neural pathways to transmit impulses from receptors to the circuitry of the brain, which manipulates the circuitry to form directives that are transmitted via neural pathways to effectors as a response. Sensation is a conscious or unconscious awareness of external and internal stimuli. Perception is the conscious awareness and interpretation of sensations. B. Modality 1.
Modality is the property by which one sensation is distinguished from another.
In general, a given sensory neuron carries only one modality. C. Components of Sensation 1. For a sensation to arise, four events must occur. These are stimulation, transduction, conduction, and translation. A stimulus, or change in the environment, capable of initiating a nerve impulse by the nervous system must be present.