perception is the stimulation of sense organ by stimuli. An example of this would be look at a picture.The light reaches the retina then the rods and cones undergo a process ,after that a neural impulse travels up the optic nerve to the askant geniculate of the thalamus. The informations at the thalamus is then relayed to the visual cortex in the occipital lobe and on to the prefrontal lobe were response is generated in the push cortex in the front lode. process that starts with stimulation of the receptors is called layer up processing. bottom up processing can be both physiologically and behaviourally. But remote cues affect perceptual destineivity because of their physical properties. The observed characteristics of the stimulus activate or initiation our senses, thus, heightening our awareness of its existence.
External cues consist of: Size(Bill Boards), Intensity(Television ads being louder in multitude intentionally to grab the viewers attention), Contrast(Colour), Novelty(Gorilla playing a get in the dairy milk ad) Repetition(Slogans being repeated) and lastly Movement(Moving Christmas window). External cues serve the purpose of enhancing our awareness of stimuli by setting them apart from there surroundings. Even though perceptual selectivity helps us select relevant stimuli, we still need to organise them in much(prenominal) a way as to make sense. Reading these speech is, in itself, a perceptual memorial tabletal task. Perceptual selectivity has enabled us to focalization on the printed matter(using size/contrast cues) but it is perceptual organisation that arranges the letters into words for us to interpret meaning. Processing that begins with a persons prior knowledge or expectations is called top-down processing.
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