. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. [8,11,13,14,15] [1,6,10,11,14,15] [3,5,13,16] Figure I. Distributed coding scheme for odors in the locust olfactory system. Each odor evokes spike activity in a subset of projection neurons in the antennal lobe (10%-15% of total complement of projection neurons). All responding neurons do not, however, respond at the same time. In the synthesized response represented in A, for example, neurons 1, 2. 4. 7, 9. and 11 respond together during epoch 1 (first gray window), whereas neurons 3, 5. 10. 11, and 12 respond together duri
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. [8,11,13,14,15] [1,6,10,11,14,15] [3,5,13,16] Figure I. Distributed coding scheme for odors in the locust olfactory system. Each odor evokes spike activity in a subset of projection neurons in the antennal lobe (10%-15% of total complement of projection neurons). All responding neurons do not, however, respond at the same time. In the synthesized response represented in A, for example, neurons 1, 2. 4. 7, 9. and 11 respond together during epoch 1 (first gray window), whereas neurons 3, 5. 10. 11, and 12 respond together during the second highlighted epoch. Hence, the ensemble of neurons whose simultaneous activity represents the stimulus (here apple) changes progressively throughout the response. Superimposed on this distributed, evolving representation are syn- chronizing events, such that most of the active neurons in any one epoch fire together and periodically (20- 30 Hz). The coherent firing of these subsets of neurons causes periodic activation of Kenyon cells in the mushroom body; this activation can be evidenced as local field potential oscillations with the same fre- quency. Because the membrane potential of individual Kenyon cells oscillates in response to presentation of the appropriate odor, it is hypothesized that the representation of the stimulus is refined in the mush- room body, by "selecting" inputs imly from those projection neurons that are synchronized. In the example in A, for example, projection neuron 10 is not synchronized to the other active neurons (3, 5. 1 1. 12) during the second highlighted epoch. We propose, therefore, that the representation of the stimulus at this time is carried by neurons 3, 5, I Land 12. The distributed representation obeys the same principles for each odor. In B, lavender is represented by a different evolving (overlapping) subset of projection Please note that these images are extracted from scanned page images that may hav
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
