attention i failures to select information. what is attention? how is the word used? examples:...
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Attention Ifailures to select information
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What is attention?
• How is the word used?
• Examples:– something bright caught my attention– I didn’t see you, I was paying attention to the game– I struggled to pay attention to the lecture– I don’t remember even cleaning the table, I must not
have been paying attention
• Attention refers to many different kinds of mechanisms
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Attention enhances some information and inhibits other information.
The enhancement enables us to select some information for further processing
The inhibition enables us to set some information aside.
Attention
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Attention and limits on information
• We need attention to limit the amount of information that is processed
• Why are there limits on the amount of information we can process?– limited sensory systems
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Eye tracking
• Eye-tracking studies can tell us which information is attended to– Our eyes are drawn both by top-down information (e.g. a goal to
find specific information) as well as bottom-up information (e.g. a flashing light)
• Commercial intro on eye-tracking
Eye tracking device
eye movements during reading
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Eye tracking and Visual Attention
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Eye tracking and Visual Attention
Painting by Giuseppe Arcimboldo. Earth. c.1570. Oil on wood. Private collection, Vienna, Austria.
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[Yarbus 1967]
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Studies for the improvement of human-computer interfaces
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David Hockney’s photo collage might be a metaphor for the way we see scenes
1 photo = 1 gaze
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Attention and limits on information
• Human information processing is massively parallel, up to a point where we have serial bottlenecks
• Bottleneck: a restriction on the amount of information that can be processed at once forcing serial processing
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Inattentional Blindness
• After bottleneck, it is the allocation of our attention that determines what is analyzed.
• Often, we are unable to process information that is unattended. This can lead to inattentional blindness (aka change blindness)
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Some of these demos are from: Simons & Levin, 1997, TINS, 1, 261-267
Do you notice the change?a) nob) yes
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Some of these demos are from: Simons & Levin, 1997, TINS, 1, 261-267
Do you notice the change?a) nob) yes
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Some of these demos are from: Simons & Levin, 1997, TINS, 1, 261-267
Do you notice the change?a) nob) yes
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Some of these demos are from: Simons & Levin, 1997, TINS, 1, 261-267
Do you notice the change?a) nob) yes
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Other demos
• Lots of demos:– http://viscog.beckman.uiuc.edu/djs_lab/demos.html
– http://dualtask.org/Change_Blindness_Demo/ChangeBlindness.html
Airplane demo
Dinner demo
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Inattentional Blindness
• Why is it hard to notice the change (initially)?
• When motion detection is disrupted, it is very difficult to observe changes to unattended image locations
• Brain makes reasonable assumption that things do not change unexpectedly (in the absence of motion cues).
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Demo of basketball players
• Task: count the number of times the white team passes the ball to each other
• Important to pay close attention to the white team
• Demos at: http://viscog.beckman.uiuc.edu/flashmovie/15.phphttp://viscog.beckman.uiuc.edu/flashmovie/25.php
(Simons & Chabris, Perception, 1999, 28, 1059 – 1074)
Did you notice anything unusual?a) nob) yes
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(not) noticing person changes Demos from Dan Simons (University of Illinois): http://viscog.beckman.uiuc.edu/change/demolinks.shtml http://viscog.beckman.uiuc.edu/flashmovie/12.phphttp://viscog.beckman.uiuc.edu/flashmovie/10.php
see also letter task: http://www.dualtask.org/
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Inattentional Blindness
• Shows there are remarkable gaps in our perception
• Human’s interpretation of the visual field is much sparser than the subjective experience of “seeing” suggests
• Our visual system might be overwhelmed without change blindness -- in a real-world setting with many moving objects, it might make sense to “track” only a few objects
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Failures of Selection in Time
When new information (even if only a small amount) arrives in a rapid stream, spending time processing it will cause you to miss some other incoming information, resulting in what are called failures of selection in time.
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Attentional Blink
Demos:http://www.cs.kent.ac.uk/people/rpg/pc52/AB_Webscript/instr.htmlhttp://psych.hanover.edu/JavaTest/Cognition/Cognition/attentionalblink_instructions.html
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Sources of Limitation
The attentional blink is a short period during which incoming information is not registered, similar in effect to the physical blanking out of visual information during the blink of an eye.
Divided-attention studies demonstrate that performance is hampered when you have to attend to two separate sources of visual information or two separate visual events. In all these cases, the decrement in performance is referred to as dual-task interference.
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Disorders of Visual Attention
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Hemispatial Neglect
• Cause– often a stroke that has interrupted the flow of blood to
the right parietal lobe that is thought to be critical inattention and selection.
• Symptoms:– Failure to acknowledge objects in the field
contralateral to the lesion
• Often no perceptual deficit– Neglect patients still activate visual regions in occipital
lobes that they claim not to be aware of
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Patients may: • fail to dress the left side of their body• disclaim “ownership” of left limbs• not recognize familiar people presented on
the left side• deny the illness
Neglect of the Visual Field
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Neglect of the Visual Field
Difficulty crossing out items
Difficulty copying items
55 y.o. right handed male R TPJ infarct (Mesulam, 2000)
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Marshall and Halligan, 1993
Patients can neglect the left side of the object, rather than the left side of space. Black lines show expected left-sided person-centred versus red lines showing actual point where the patient neglected
Visual neglect syndrome can be object-based
Control
Neglect patient
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Visual neglect syndrome can be object-based
Patient with object neglect cannot detect differences on left side of an object even when falling into right side of space
Driver and Halligan (1991)
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Visual neglect syndrome can be object-based
When a right neglect patient is shown a dumbbell that rotates,the patient continues to neglect the object that had been on the right, even though it is now on the left (Behrmann & Tipper, 1999).
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Simultanagnosic (Balint Syndrome) patients only attend to one object at a time
Simultanagnosic patients cannot judge the relative length of twolines, but they can tell that a figure made by connecting the endsof the lines is not a rectangle but a trapezoid (Holmes & Horax, 1919).
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Balint patients can only attend to one object at a time even if they are overlapping
Luria, 1959