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Fig. 2. Example of the LEOD measurements obtained from a single fish. All data
shown are averages of 15 consecutive measurements. The position relative to
the length of the fish is given in the topmost row; the LEOD components (z and
y) are shown in the second row. The field vector trajectory of the z
and y LEOD is depicted in blue in the third row. At the 50% position,
the direction of rotation of the vector loop is shown as an example. Note that
the LEODs at the nasal region and the Schnauzenorgan (SO) are highly in phase,
which can also be seen in the individual field components of the z
and y data shown in black and orange in the second row. The fourth
row shows the field module of all three LEODs. In the bottom row, the field
vector calculated at the peak of the field module is shown, i.e. the vectors
represent the effective stimulus strength and direction. Here, black arrows
indicate the vectors as determined relative to the x, y and
z plane. Orange arrows are identical to the black vectors, except
that their angle is given with respect to the sensory surface of the fish. The
drawing of the fish is aligned to match the relative body positions where
measurements were taken. Note that the electric organ is situated in the
caudal peduncle before the tail fin. Each dot in the drawing indicates the
location of an individual mormyromast, showing that the density is highest at
the Schnauzenorgan.
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