The ornamental design for an apparatus for measuringelectrophysiologicalsignals, as shown and described.
FIG. 1 is a right perspective view of the apparatus showing our new design;
FIG. 2 is a left perspective view thereof;
FIG. 3 is a left side view thereof;
FIG. 4 is a plan view thereof; and,
FIG. 5 is a front view thereof.
The right side view is the mirror image of the left side view. The rear view is the mirror image of the front view except that the upper part is as shown in FIG. 1