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MSU PSY 200 - Early Vs. Late Selection

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Psy 200 1st Edition Lecture 7 Current Lecture Early Vs. Late Selection-Selective attention tasks-Dichotic listening- Colin Cherry (1953)- Selecting one thing to listen to when presented with two options.-Cherry’s findings- Can’t comprehend two things at one time.-Suggests that unattended channel is processed shallowly (sound characteristics) but not deeply(meaning). -Pitch can be noticed, but not change in language.Neville Moray (1959) Experiment- recognition testDonald Broadbent’s Filter Theory- Early attentional selection Challenges to Early Selection Theory- When people heard sentences that included their name, they noticed about 33% of the time.When people heard sentences without their name, they noticed about 6% of the time.Conclusion: Meaning of unattended message is processed. Thus, selection is “later” than previously thought. Stroop Effect- word meaning gets processed even when it shouldn’t. Which model is right? Could be both… how much meaning is extracted depends on the nature of the task and how difficult it is. -The amount of processing of irrelevant information depends on cognitive load. -Less evidence that unattended stimuli are analyzed when there are more attended or more unattended stimuli. Load Dependent Flanker Effects -much greater flanker compatibility effects for low load condition.Maybe best not to think of early or late selection…Maybe better to think of limited resources. How does attention work? These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.-use color and word tasks to localize where color and word regions are in individual brains.-see how regions behave in Stroop and control task.-color area more active, word area suppressed compared to control task.Attentional Control: Evidence from Neurological Patients -Neglect-right to inferior parietal damage causes patient to ignore left half of the visual space. -both to visual stimulation and imagery. Consequences Vs. Control of Attention-sensory/perceptual regions show consequences of attention-excited or suppressed based on what you are attending. -parietal lobe important for control attention -moves or sustains attention-control excitability of sensory/perceptual regionsAttention Benefits Performance-accuracy is better for attended items -can set attention to location, features, or objectsPriming Vs. AttentionHigh validity- benefit of attentionLow validity- benefit of primingAttention improves performance if target matches warning signal, but has a huge cost if it does not


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