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1.
Fig. 7.

Fig. 7. From: Layer-specific network oscillation and spatiotemporal receptive field in the visual cortex.

Excitatory and inhibitory RFs of L2/3 and L5 neurons. (A) Excitatory and inhibitory RFs of a L2/3 neuron (20 ms/frame). Traces above show time course of the RFs (solid line, excitatory; dashed line, inhibitory). (B) Excitatory and inhibitory RFs of a L5 neuron (solid line, excitatory; dashed line, inhibitory).

Wenzhi Sun, et al. Proc Natl Acad Sci U S A. 2009 October 20;106(42):17986-17991.
2.
Fig. 2.

Fig. 2. From: Layer-specific network oscillation and spatiotemporal receptive field in the visual cortex.

Spontaneous synaptic inputs to L5 pyramidal neurons. (A) Fluorescence image of an example L5 neuron. Dashed and dotted lines, estimated borders of L4. (B) Example current (Upper) and voltage (Lower) traces recorded under voltage and current clamp, respectively. (Scale bars: 500 ms, 50 pA/5 mV.) (C) Power spectrum of spontaneous currents. (D–F) Same as A–C for another L5 neuron.

Wenzhi Sun, et al. Proc Natl Acad Sci U S A. 2009 October 20;106(42):17986-17991.
3.
Fig. 1.

Fig. 1. From: Layer-specific network oscillation and spatiotemporal receptive field in the visual cortex.

Spontaneous synaptic inputs to L2/3 pyramidal neurons. (A) Fluorescence image of an example cell. Numbers, distances from pia in μm. Dashed and dotted lines, estimated upper and lower borders of L2/3. (B) Example current (Upper) and voltage (Lower) traces recorded under voltage and current clamp, respectively. (Scale bars: 500 ms, 50 pA/5 mV.) (C) Power spectrum of spontaneous currents. (D–F) Same as A–C for another L2/3 neuron.

Wenzhi Sun, et al. Proc Natl Acad Sci U S A. 2009 October 20;106(42):17986-17991.
4.
Fig. 4.

Fig. 4. From: Layer-specific network oscillation and spatiotemporal receptive field in the visual cortex.

Dependence of spontaneous synaptic current on holding potential. (A) Spontaneous synaptic currents recorded from a L2/3 neuron held at −100 (black), −70 (dark gray), and 0 (light gray) mV. (Scale bars: 250 ms; 200 pA.) (B) Power spectra of currents recorded at the three holding potentials. (C) Same as A for a L5 neuron. (Scale bars: 250 ms; 400 pA.) (D) Same as B for the cell in C. (E) Recording depth vs. power ratio for currents recorded at different holding potentials.

Wenzhi Sun, et al. Proc Natl Acad Sci U S A. 2009 October 20;106(42):17986-17991.
5.
Fig. 5.

Fig. 5. From: Layer-specific network oscillation and spatiotemporal receptive field in the visual cortex.

Spatiotemporal RFs of L2/3 and L5 neurons. (A) A segment of sparse noise sequence. (B) Synaptic current recorded during the stimulus in A from a L2/3 neuron. (C) Representation of spatiotemporal RF as average current responses in different pixels, shown on the same scale as B; duration of each trace is 200 ms. Dashed line, current level at resting state. (D) Representation of spatiotemporal RF as spatial RF profile at different time delays (10 ms/frame). (E–G) Same as B–D for a L5 pyramidal neuron.

Wenzhi Sun, et al. Proc Natl Acad Sci U S A. 2009 October 20;106(42):17986-17991.
6.
Fig. 6.

Fig. 6. From: Layer-specific network oscillation and spatiotemporal receptive field in the visual cortex.

Relationship between spatiotemporal RF properties and spontaneous activity pattern. (A) Illustration of parameter fitting of spatiotemporal RF. Spatial RF in each frame was fitted with 2-D Gaussian (Lower, white ellipse). Shown are spatial RF profiles at five temporal delays (circles in Upper trace). The third frame shown is the RF at the time of peak response; diameter of ellipse (geometric mean of long and short axes) is plotted in C. Amplitude of Gaussian fit is plotted against time (Upper trace) to obtain the time of peak and RF duration. (B) Response duration vs. spontaneous power ratio. The correlation is significant (P < 0.002). (C) RF size vs. power ratio. The correlation is significant (P < 0.0003).

Wenzhi Sun, et al. Proc Natl Acad Sci U S A. 2009 October 20;106(42):17986-17991.
7.
Fig. 3.

Fig. 3. From: Layer-specific network oscillation and spatiotemporal receptive field in the visual cortex.

Dependence of spontaneous activity pattern on cortical depth. (A) Power spectra of spontaneous synaptic currents averaged from 8 reconstructed L2/3 neurons (Upper) and 12 reconstructed L5 neurons (Lower). The spectrum of each cell was normalized by the mean power density at 5–10 Hz. Thick line, mean; thin lines, ± SEM. (B) Definition of “high” and “low” frequency ranges for computing power ratio. Shown is power spectrum of an example L5 neuron. The high frequency range (10–20 Hz) is chosen to include the 10–15 Hz peak. (C) Cortical depth estimated from distance traveled by electrode vs. power ratio. The correlation is highly significant (P < 10−9). Filled symbols: reconstructed cells (■, L2/3; ▾, L5).

Wenzhi Sun, et al. Proc Natl Acad Sci U S A. 2009 October 20;106(42):17986-17991.

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