Sloan-Swartz Summer Meeting 2007

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Presentation transcript:

Sloan-Swartz Summer Meeting 2007 Attentional modulation of feature selectivity in area V4 James Mazer Department of Neurobiology Yale School of Medicine Sloan-Swartz Summer Meeting 2007

What is feature attention? Feature-based attention: attention directed towards a particular value along some stimulus dimension in contrast to... attention to a particular region of space (space-based) attention to a particular visual “channel” or feature dimension

Why study feature attention? natural visual environments are cluttered during natural vision we often know what we want, even when we don’t know where it is feature attention, like spatial attention, can provide some resolution of limited neural bandwidth or capacity problems

How do we study feature attention? Where’s Waldo? Visual Search

Extrastriate area V4 IT V4 V1 V2

Salience maps & visual search IT/PFC V4 LGN V1 V2

Salience maps & visual search IT/PFC V4 oculomotor LGN V1 V2

Feeviewing visual search task non-match (2-5s) hold bar sample (2-4s) grab bar delay (2-4s) hold bar match (2-5s) release bar

Feeviewing visual search task

Freeviewing visual search behavior

Modeling attentional effects response baseline gain tuning shift passive response stimulus dimension

Freeviewing reverse correlation single fixation eye position eye velocity spikes  time 

Freeviewing reverse correlation stimulus waveform + spikes …

Modeling attentional effects response baseline gain tuning shift passive response stimulus dimension

Freeviewing: summary of modulatory effects no modulation 15% D baseline 30% D gain 49% D shape 30% n=105

Freevewing: summary of modulatory effects pure Dshape 2% 5% 6% no modulation 15% 17% 30% 9% 17% pure Dgain pure Dbaseline n=105

Freeviewing reverse correlation tuning spatial frequency domain m0067 STRF proj’d into stim PCA space

Tuning shift: matched filter search target tuning A  spatial domain spatial frequency domain spatial frequency domain m0067 STRF proj’d into stim PCA space

Tuning shift: matched filter search target tuning A   B C   D spatial domain spatial frequency domain spatial frequency domain m0067 STRF proj’d into stim PCA space

Tuning shift: unknown relationship to target

Summary feature attention can alter (1) mean rate, (2) gain and (3) preferred stimuli in V4 baseline, gain and selectivity modulations occur in all possible combinations preference changes could facilitate target detection during visual search (but it’s not a simple matched filter). maximal tuning modulation occurs in neurons with broadest orientation tuning

Acknowledgements Gallant Lab (UCB) Jon Touryan Monica Cano Vinas Julie Golomb Matt Krause Xiao-Jing Wang Gallant Lab (UCB) Stephen David