Attention: Key concepts
There is a capacity limit to attention- comes from limited processing by the brain
Anything below the bottleneck, will have limited attention capacity
Sensory info comes in registered-has a limited capacity- gating mechanism filters out
Attention: Key Debates
When filtering takes place?
Some argue bottleneck happens early on and others later.
Sensory input- cortical areas process info- after perceptual analysis, brain carry out semantic
analysis- to executive function and decision making
Where does the bottleneck happen? Broadbent argued this happens very early, right after
Late theorist argues- filtering doesn’t happen until semantic analysis
Do we analyze completely or cut out before?
Dichotic listening paradigm- different streams of info in each ear
Subject is repeating what they are hearing in left ear
If you play two different info in each ear- unattended ear-subjects couldn’t say what was playing
Filtering of info happens very early such that unattended info doesn’t reach semantic stage
Von Wright- first stage- words with electric shock- played these words in unattended stream-
they still show galvanic skin response to these words
Moray- under certain circumstances, subjects can pick up unattended info- there is some extent
of unattended info therefore argues for later filtering
Treisman- attenuator- analyzes info to a certain extent but only does to an extent
Lavie- possible that there is both early and late processing happening simultaneously- when
there is perceptual info is low- higher level processing, high perceptual info- low level processing
What does selective attention emphasize?
Posner argues that-carried out on the basis of spatial location
Duncan- carried out by object- ig