Reinagel lectures 2006 Take home message about LGN 1. Lateral geniculate nucleus transmits information from retina to cortex 2. It is not known what computation if any occurs in the LGN 3. For white noise stimuli, responses are precise and reliable 4. PRECISION is the trial to trial jitter in spike TIMING (order 1msec) feed forward inhibition may be the mechanism of precise timing 5. RELIABILITY is the trial to trial variability in spike NUMBER (subpoisson) refractoriness may be the mechanism of reliable spike count 6. BURSTING in the LGN is a distinct biophysical phenomenon, of unknown importance. The *right* question to ask is whether the bursting state is visually primed and whether priming itself encodes information 7. We now have a visually behaving rodent prep to address all these questions Take home message about efficient coding 1. Natural scenes are full of spatial and temporal correlations 2. This suggests WHY center-surround RF's are GOOD: redundancy reduction 2. Test: LGN responses to natural scenes are decorrelated (whitened) 3. More generally: are natural scenes optimal stimuli? is this even the right question? www-biology.ucsd.edu/labs/reinagel/
52
Embed
Reinagel lectures 2006 Take home message about LGN 1. Lateral geniculate nucleus transmits information from retina to cortex 2. It is not known what computation.
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Reinagel lectures 2006
Take home message about LGN1. Lateral geniculate nucleus transmits information from retina to cortex2. It is not known what computation if any occurs in the LGN3. For white noise stimuli, responses are precise and reliable4. PRECISION is the trial to trial jitter in spike TIMING (order 1msec)
feed forward inhibition may be the mechanism of precise timing5. RELIABILITY is the trial to trial variability in spike NUMBER (subpoisson)
refractoriness may be the mechanism of reliable spike count6. BURSTING in the LGN is a distinct biophysical phenomenon, of unknown
importance. The *right* question to ask is whether the burstingstate is visually primed and whether priming itself encodes information
7. We now have a visually behaving rodent prep to address all these questions
Take home message about efficient coding1. Natural scenes are full of spatial and temporal correlations2. This suggests WHY center-surround RF's are GOOD: redundancy reduction2. Test: LGN responses to natural scenes are decorrelated (whitened)3. More generally: are natural scenes optimal stimuli?