Auditory prostheses use implanted electrode arrays that permit stimulation at many sites along the tonotopic axis of auditory neurons. Psychophysical studies demonstrate that measures of implant function, such as detection and discrimination thresholds, vary considerably across these sites, that the across-site patterns of these measures differ across subjects, and that the likely mechanisms un...

Auditory-vocal interaction, the modulation of auditory sensory responses during vocal production, is an important but poorly understood neurophysiological phenomenon in nonhuman primates. This sensory-motor processing has important behavioral implications for self-monitoring during vocal production as well as feedback-mediated vocal control for both animals and humans. Previous studies in marmo...

The analysis of extra-cellular neural recordings typically begins with careful spike sorting and all analysis of the data then rests on the correctness of the resulting spike trains. In many situations this is unproblematic as experimental and spike sorting procedures often focus on well isolated units. There is evidence in the literature, however, that errors in spike sorting can occur even wi...

For a social scientist of a particular kind, the first thought that springs to mind in association with ‘inconsistency’ is Arrow’s famous impossibility theorem. The association is a natural one because, in the original formulation, inconsistency plays a double role in Arrow’s theorem. At the first level, the requirement that any aggregate ‘community’ ranking of social states be transitive is ak...

Implanted neuroprosthetic systems have been successfully used to provide upper-limb function for over 16 years. A critical aspect of these implanted systems is the safety, stability, and-reliability of the stimulating electrodes and leads. These components are (1) the stimulating electrode itself, (2) the electrode lead, and (3) the lead-to-device connector. A failure in any of these components...

Brain correlates of conditioned leg flexion behavior were studied in dogs bearing chronically implanted electrodes. Animals were trained to asymptote under either classical aversive or avoidance contingencies, and then were retrained under the other contingency; the order of training was balanced across subjects. The training groups were further subdivided into 3and .5-set CS-US intervals. Thes...

In eight dogs with chronically implanted electrodes click-evoked potentials were recorded in the ectosylvian and suprasylvian gyri. During daily sessions clicks were presented in several short trains with a steady interclick interval of 1 s and not followed by any unconditional stimulus. The largest amplitudes resulted from the first and last clicks in the series so that curves plotted for each...