Implications of Cross-modality Stimulus Permutations for the CNV

Abstract

Publisher Summary This chapter focuses the presentation of conditional and imperative stimuli in permutations of three modalities using a constant. In an experiment described in the chapter, silver–silver chloride electrodes of a type designed for DC recording were attached to the vertex, each mastoid and the center of the forehead. The vertex was referred to the center of a 25-kohm potentiometer connected between the forehead electrode and the paired mastoids. This enabled some of the ocular potentials that might have contaminated the CNV recordings to be balanced out. The EEG signals, stimulus markers, and subject response marker were recorded on a Van Gogh polygraphic recorder. The signal from the vertex derivation was recorded using both DC and AC amplifiers while other derivations were recorded only with AC amplifiers. After thee electrodes were affixed, Ss were seated in reclining easy chairs and faced an off-white blank wall in a room of constant illumination. Eye blink potentials were balanced out, and the Ss were instructed in the format of the experiment, that is, they would receive different permutations of stimuli.