1. An apparatus, comprising: a flexible band; a first hub coupled to a first end of the flexible band; a first electrode extending from the first hub a first distance; a second electrode extending from the first hub a second distance, the second distance different than the first distance, wherein the first hub is rotatable on the first end of the flexible band to change a position of the first electrode and the second electrode; a second hub coupled to a second end of the flexible band; a third electrode extending from the second hub a third distance; a fourth electrode coupled to the second hub a fourth distance, the fourth distance different than the third distance; a clock signal receiver to receive a clock signal representing timing information of a stimulus material; and a processor to synchronize the timing information with neuro-response data gathered from at least one of the first electrode, the second electrode, the third electrode or the fourth electrode.