Aspects of attention
Week 2 psy 308
Signal is what your looking for while noise is everything else
Ie Waldo is your signal and all the other objects are the noise
Lifeguard, looking for your friends in a crowd
Signal = target stimulus
4 possible scenarios
Signal Detect a signal. Don't detect a signal
Present Hit Miss
Absent False alarm Correct rejection
What determines your number of hits and false alarms?
Sensitivity : how good you are at the task
Criterion: how willing you are to detect a signal (may shift depending on costs
associated with errors)
Life guard more willing to have a false alarm ...liberal??
CJS better to have a miss to let someone guilty out then put someone innocent in
Attending to a field of stimulation over a prolonged period of time while seeking to
detect a target stimulus that appears at an unknown time
Why do you think performance drops over time?
Sensitivity stays constant
Criterion becomes more conservative
Strong influence of expectations
Can we be highly vigilant and still miss something big???
Referred to as change blindness
We often miss large changes in our world Occurs even when you are actively searching for a change
Due to movie cuts, blink, etc
Observers fail to notice changed introduced during a blank screen, a blink, an
eye movement, or a motion-picture cut it pan
Mechanisms not yet completely understood
Practical implications ?
Information processing model
Sensory memory a couple secs but a large capacity
If it catches your attention moved to short term memory
Short term memory limitations
Magical number is 7 plus or minus 2 for your short term memory
This is why phone numbers are 7 digits
Time limit 30 sec to a min
Which means that info will