Article Figures & Data
Figures
- Figure 1.
Unadapted responses of the PrV and SpVi are similar. A, PSTH examples of responses to single-whisker deflection of different velocities delivered at 0.5 Hz (inset) from a PrV neuron (left) and a SpVi neuron (right). B, Averaged responses of the cells in A as a function of velocity (mean ± SD). C, Population data from 28 PrV neurons and 27 SpVi neuron (mean ± SE). There are no significant differences in all velocities.
- Figure 2.
Coding of different contexts in extracellular recording examples of PrV and SpVi neurons. A–C, PSTHs from the PrV (average of 5 repeats; top) and SpVi (average of 5 repeats; middle) for three example stimulation patterns (bottom) from the low- (A, blue), medium- (B, orange), and high-intensity (C, red) contexts. D, E, Summary of the responses of the PrV (D) and SpVi (E) example neurons in A–C. In the PrV encoding of stimulus velocity improves as we increase the mean intensity, whereas in the SpVi the opposite is true. This was quantified by the coefficient of determination of a linear regression (R2).
- Figure 3.
PrV and SpVi representations of intensity are optimized at different contexts. A, B, Correlation coefficients for all PrV (n = 41) and SpVi (n = 45) neurons with population average and SE as crosshairs. In each panel, the correlation for a higher-stimulus intensity context is presented against a lower-intensity context. C, D, Comparison of mean correlations between stimulus velocity and response for the PrV and SpVi obtained using linear (C) and sigmodal (D) fits. E, F, Averaged responses of PrV (E) and SpVi (F) neurons as a function of stimulation velocity at the three intensity contexts: low (blue circles), medium (orange squares), and high (red diamonds). Although unadapted responses (black circles) are similar for both nuclei, PrV codes stimulus intensity more linearly at the high-intensity context and the SpVi better codes the low-intensity context. G, H, Population responses as in E, F as a function of normalized velocity (Z-scores).
- Figure 4.
Intracellular coding of PrV and SpVi neurons of different contexts. A–C, Average voltage traces from a PrV cell (n = 5 repeats; top) and a SpVi cell (n = 5 repeats; middle) for the low- (A), medium- (B), and high-intensity (C) contexts (stimulation patterns are depicted below the recordings). D, E, Summary of the EPSP peak amplitude responses of the PrV (D) and SpVi (E) example neurons in A–C. In the PrV encoding of stimulus velocity improves as we increase the mean intensity, whereas in the SpVi the opposite is true (quantified by the coefficient of determination of a linear regression between EPSP peak and stimulus velocity). F, Population comparison of mean coefficient of determination between stimulus velocity and response for the PrV (n = 4) and SpVi (n = 5) obtained using linear fitting.
