|
| |
|
|
|
|
||||
| Home Help Feedback Subscriptions Archive Search Table of Contents | ||||
|
Fig. 3. This theoretical schema explains qualitatively how the local electric organ
discharge (LEOD) at the receptive field center (RF) changes with the position
of a conductive object. (A) The colored bars indicate different positions of a
cylindrical object. (B) Colored curves indicate the corresponding image
profile, i.e. the change in LEOD peak-to-peak amplitude compared with the
basal LEOD (broken line), projected on the fish's receptive surface when the
object is placed at the different positions indicated by corresponding colors
in A. Image amplitudes at points indicated by colored dots are plotted below
in C. (C) The changing image as the object moves past the receptive field
center. The graph was constructed by plotting the change in LEOD peak-to-peak
amplitude seen at the center of the receptive field as a function of the
rostro-caudal position of the object. Colored points represent the image
amplitude compared with the basal LEOD, seen at the receptive field center
when the object is in the corresponding color-coded position. Note that this
graph reflects the Mexican hat shape present in the LEOD profiles but shows
inverse asymmetry: thus, when the object is caudal to the center of the
receptive field, the surround effect at the receptive field center is larger
than when the object is rostral.
|
