Bartlett D. Moore IV

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Temporal Frequency and Orientation Selectivity
in Ferret V1
Bartlett D. Moore IV Center for
Neuroscience University of California, Davis
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Circular Receptive Fieldsin Retina and LGN
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Elongated Receptive Fields in V1 Simple Cells
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A Feedforward Model
Hubel and Wiesel, 1962
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Orientation Tuning of LGN and V1 cells differs
LGN
V1
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Temporal Frequency tuning of LGN and V1 cells
differs
Cortical cells register only slower TFs
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Methods

• Recording Extracellular electrodes in ferret V1
• Stimulation drifting sine-wave gratings

Drifting sine-wave gratings
The ferret
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Protocol

• Determine orientation selectivity of cell
• Determine spatial frequency tuning
• Determine temporal frequency tuning
• Observe orientation tuning at 20, 50, and peak
  TF values

MAX
50
20
Temporal frequency
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Observations
200
Ferret V1
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Future Directions
Summary

• Conducted experiments investigating effects of
  temporal frequency on orientation selectivity
• Collected data from 5 ferrets
• Started data analysis

More Data!
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Acknowledgements

• Special Thanks To
• Henry Alitto
• Kelly Hening
• Austin Collins
• Dr. Marty Usrey
• the ferrets