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Perception or Cognition is the mental process of interpreting the information received by the sense organs from the environment. Sensation is a physical process, whereas, perception is a psychological process. For example, upon smelling the scent of roses, a sensation is the scent receptors in the body detecting the odor of roses, but the perception may be "Mmm, this smells like roses."<ref name=":0">Introduction to Psychology course on NPTEL</ref>
Perception is the mental process of interpreting the information received by the sense organs from the environment. Sensation is a physical process, whereas, perception is a psychological process. For example, upon smelling the scent of roses, a sensation is the scent receptors in the body detecting the odor of roses, but the perception may be "Mmm, this smells like roses."<ref name=":0">Introduction to Psychology course on NPTEL</ref>
== Introduction ==
== Introduction ==
Perception is a set of psychological processes, which help us in understanding the world around us. We encounter numerous stimuli every second through our sensory organs. It brings about awareness and interpretation of our environment. It involves selection, organization and interpretation of the sensory information based on one's previous experiences, needs, aspirations and other's experiences.<ref>http://egyankosh.ac.in//handle/123456789/61382</ref>
Perception is a set of psychological processes, which help us in understanding the world around us. We encounter numerous stimuli every second through our sensory organs. It brings about awareness and interpretation of our environment. It involves selection, organization and interpretation of the sensory information based on one's previous experiences, needs, aspirations and even considering other's experiences.<ref>http://egyankosh.ac.in//handle/123456789/61382</ref>
Perception refers to the way sensory information is organized, interpreted, and consciously experienced. Perception involves both bottom-up and top-down processing. Bottom-up processing refers to the fact that perceptions are built from sensory input. On the other hand, how we interpret those sensations is influenced by our available knowledge, our experiences, and our thoughts. This is called top-down processing.<ref name=":0" />
== Stages of Perception ==
Broadly, the process of perception involves three steps, when a stimulus is encountered.
=== Selection ===
Selection is the first stage of perception. At a given time, due to various factors, the human brain consciously or unconsciously, processes only some stimuli ignoring the others. For example, when engaged in deep conversation we tune out of many sounds in the background and do not register them. The selected stimulus becomes the "attended stimulus."
=== Organization ===
Perception refers to the way sensory information is organized, interpreted, and consciously experienced. In this stage, stimuli are arranged mentally in a meaningful pattern. Perception involves both bottom-up and top-down processing. Bottom-up processing refers to the fact that perceptions are built from sensory input. On the other hand, how we interpret those sensations is influenced by our available knowledge, our experiences, and our thoughts. This is called top-down processing.<ref name=":0" />
== Sensation and Sensory Organs ==
== Sensation and Sensory Organs ==
Sense organs are the primary sources for gathering information and providing it to the mind for further processing. Sense organs receive the reflection emanating from the objects which are then reflected in the inner mind.
Sense organs are the primary sources for gathering information and providing it to the mind for further processing. Sense organs receive the reflection emanating from the objects which are then reflected in the inner mind.
Sensory receptors are specialized neurons that respond to specific types of stimuli. When sensory information is detected by a sensory receptor, sensation has occurred. For example, light that enters the eye causes chemical changes in cells that line the back of the eye. These cells relay messages, in the form of action potentials to the central nervous system. The conversion from sensory stimulus energy to action potential is known as transduction.
== Factors affecting sensation and perception ==
== Factors affecting sensation and perception ==