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GaborComp.0.0

2008 Sep 01
Summary   This complex cell model consists of the sum of the squares of the outputs of two linear filters that are spatially 90 degrees out of phase. The linear filters are separable in space-time, being the product of spatial Gabor functions and a biphasic temporal function.

Methods

• GaborComp.0.0.mod - Model parameter file.

• Linear filters

  Cross-sections of the two spatial filters are shown below. The temporal filter, constructed from the difference of two Maxwell functions, is shown at the right (time units are ms). The spatial filter cross-sections were take at the time of the peak of the temporal filter.

  

Results

The results here were obtained using the standard single unit response file.

Tuning curves for sinusoidal gratings

• Direction - at TF 10 Hz, SF 1.0 cyc/deg
• Spatial frequency - in preferred and anti-preferred direction
• Temporal frequency - at SF 1.0 cyc/deg
• Size - at SF 1.0 cyc/deg, TF 10 Hz
• Static phase - at SF 1.0 cyc/deg.

Discussion

This model has a high driven firing rate, zero spontaneous rate, and narrow tuning for orientation, SF and TF. The response is transient because the temporal filter is a balanced biphasic function. The preferred TF is 10Hz and the preferred SF is 1.0 cyc/deg.