The ornamental design for the brain sensing headband, as shown and described.
FIG. 1 is a front perspective view of the brain sensing headband.
FIG. 2 is a front plan view of the brain sensing headband.
FIG. 3 is a right side plan view of the brain sensing headband.
FIG. 4 is a back plan view of the brain sensing headband.
FIG. 5 is a left side view of the brain sensing headband.
FIG. 6 is a top plan view of the brain sensing headband; and,
FIG. 7 is a bottom plan view of the brain sensing headband.
The broken line shown in the drawings are for the purpose of illustrating portions of the brain sensing headband that form no part of the claim design.