The Journal of Neuroscience, December 8, 2004, ():
Spatial and Temporal Organization of Ensemble Representations for Different Odor Classes in the Moth Antennal Lobe
J. Neurosci. Lei et al.
24: 11108
Supplemental data
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Supplemental Figure 1
Effect of stimulus duration on response patterning and coactivity between ensemble units. The responses of some cells in this 6-unit ensemble varied with stimulus duration, but these changes were also odor dependent. (A) Responses of one unit to 1-sec (left) and 500-ms (right) pulses of the plant odorant lin (see Fig. 1). The consistently phasic response of this unit was observed over repeated trials, as shown in the raster plots (upper) and peri-stimulus time histograms (lower). A 1-sec pulse of lin (10 µg) evoked a phasic excitatory response followed by nearly complete suppression. In contrast, a 500-msec pulse evoked a similar period of excitation, but the response lacked the later inhibitory phase. (B) Responses of the same unit to the odorant paa (10 µg) revealed a very different response pattern. In contrast to the monoterpenoid stimulus, this aromatic evoked an early period of suppression followed by tonic spiking that showed little effect of stimulus duration. (C). To quantify the potential effect of stimulus duration on unit coactivity across the entire ensemble, we converted the C% values for lin and paa responses (mean ± SD; n=9 trials) for all unit pairs (n=16) into vectors for each duration, then calculated the correlation coefficient between the vectors for each odorant (see Fig. 8D). This analysis revealed r-values of 0.68 and 0.81 for lin and paa, respectively. There was no clear relationship between unit coactivity and stimulus duration: some unit pairs showed significantly greater coactivity with the longer duration pulse (+), while others showed significantly less coactivity (-) (Mann-Whitney U test, p<0.05).
