Fig. 3.

Right. Functional representation of direction in the terminal ganglion. A, Functional representation of direction formed by L afferents terminal arborizations. Each color cloud represents the average probability distribution of the terminal fields of afferents tuned to a particular wind direction. The directional tuning of each density cloud is represented by its color (shown also by the color wheelat the top right corner). The color wheel shows the direction with respect to the animal’s body in the horizontal plane;yellow indicates air currents directed at the animal’s head. B, Functional representation of direction by the M afferents (same view as in A). This figure demonstrates that the direction map of the M afferents is similar in structure to the L afferent map. The terminal fields of the M afferents overlap less with each other than the L afferents, making the map appear patchy and less tightly organized. C, Representation of direction by both L and M afferents within the terminal ganglion. M and L afferents tuned to the same direction are spatially in register with one another, allowing direction as a whole to be represented continuously within the terminal ganglion.