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- Open Access
Phase-of-firing coding of dynamical whisker stimuli and the thalamocortical code in barrel cortex
© Siadatnejad et al; licensee BioMed Central Ltd. 2013
- Published: 8 July 2013
- Spike Train
- Cortical Layer
- Temporal Precision
- Cortical Column
- Texture Discrimination
We then examined whether the pure spiking activity contributes in the information manifested in the high frequency PoF components. The temporal precision of spikes was quantified using a novel measure, information in the phase of the band-bass filtered spike trains. In all depths, the spikes lacked any temporal-resolution larger than 30 Hz (Figure 1D). We conclude that the output of the local computational processes in a cortical column lacked the temporal precision that they received in input (i.e., which was represented by CSD). This suggests a transformation of the information encoding from a high-precision input code relayed from thalamus, with fast and temporally precise dynamics (see ), into an output spiking code with a lower temporal resolution. Nevertheless, information about the high-frequency and fast varying components of the stimulus may still be encoded within the low resolution and irregular cortical spikes. In fact previous studies have shown that a spike-count code in the cortex can encode such stimulus features . The computational demands of the whisker system (such as fine texture discrimination, and perception of subtle vibrations in the air) require that the thalamus relays the high-frequency components of the whisker deflections into the cortical barrels, which are capable of performing more complex neural computation.
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