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Chapter 8

Chapter 8 Attention and Space Perception

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Chapter 8 Attention and Scene Perception Visual acuity is limited in the periphery. Hence you cant read more than 2 books at a time. even if the letters are large. ^ general problem that the retinal array contains more information than that can be processed Why cant we process everything at once? We dont have the brains for it. recall recognizing a single object requires a sizeable chunk of the brain and its processing power. Processing everything all at once requires a brain that will not fit in the human head. If itisnt possible to process everything then what should be processesd? --- we pay attention to some stimuli and not others. Attention- is not a single thing and it doesnot have a single locus in the brain.but attention is the name given to family of mechanisms that restrict processing in various ways Can be overt or covert Overt attention- refers to directing a sense organ at a stimulus. covert attention -refers to discreet attention while stimulus organ is pointed somewhere else. Divided attention paying attention simultaneously to two things Sustained attention paying attention for prolonged period of time In this chapter, mostly concerned with selective attention. www.notesolution.com Selective attention - the form of attention involved when processing is restricted to a subset of possible stimuli. The ability to pick one or few things to focus on. But these terms are not mutually exclusive. Operational mechanisms operate in all of the senses not just visual attention We can also use attentional mechanisms to give one sense priority over another Selection in Space What does it mean to pay attention? Michael Posner created the classic situation. The subject must hit the response key as fast as possible when the probe appears. Measure of interest is the reaction time (RT)- amount of time that elapses between the point when probe appears and the point when the subject hits the response key. What if the subject is given a cue? Cue is a stimulus that might indicate where(OR what) a subsequent stimulus will be. Valid cue when the probe appears in the cued location. RT decreases when valid cue. RT is faster because the participant is paying attention to the current location. No cue condition RT is longe(=slower) compared to valid cue Invalid cue occurs when the probe id misleading. Appears in the area opposite of the cued location. RTs are slower here than in the control condition because the subject has been fooled into attending to the wrong location. www.notesolution.com
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