Averaged auditory evoked vertex responses were obtained from eight normal-hearing sub~cts in response to 32 monaural 1000-Hz tone bursts at 30 combinations of recovery period and stimulus intensity. From curves describing N1-P2 peak-to-peak amplitudes, an equation was derived that describes the combined effects of recovery period and stimulus intensity on evoked response ampfitude. The results ...

In the article “Cortical Activation Patterns Evoked by Temporally Asymmetric Sounds and Their Modulation by Learning” by Junsei Horikawa and Hisayuki Ojima, which appeared on e0241-16.2017 of the March/April 2017 issue, authors provided a misleading legend for Figure 6. Since the figure includes not only response traces evoked by F but also those evoked by revF, the description “evoked by the f...

Middle latency auditory evoked potentials were examined in 7 proficient subjects during the practice of meditation on the syllable 'OM', to determine whether these potentials would differ significantly from those recorded during the baseline state without practicing mediation. Similar records were also obtained in 7 'naive' subjects, matched for age, before and during a control period which inv...

Differences in cortical geometry within and between subjects can complicate multifocal visual evoked potential (mfVEP) and standard evoked potential (EP) intra- and inter-subject comparisons. We present methods for aligning temporal intra- and inter-subject data prior to comparison. Multiple groups have informally observed that the two dominant temporal principal components (PCs) of the pattern...

Neuroimaging studies have shown that the visual cortex of visually impaired humans is active during tactile tasks. We sought to determine if this cross-modal activation in the primary visual cortex is correlated with vision loss in individuals with retinitis pigmentosa (RP), an inherited degenerative photoreceptor disease that progressively diminishes vision later in life. RP and sighted subjec...

Objectives: A general framework for identifying and describing structure in a given sample of evoked response single-trial signals (STs) is introduced. The approach is based on conceptually simple geometrical ideas and enables the convergence of pattern analysis and non-linear time series analysis. Methods: Classical steps for analyzing the STs by waveform are first employed and the ST-analysis...

We recorded laser-evoked potentials (LEPs) from 20 normal subjects by stimulating the skin with pulses from an infrared CO2 laser. The conduction velocity of the peripheral afferent fibers mediating the LEPs averaged 14.9 m/sec. The amplitude of the LEP components correlated significantly with perceived stimulus intensity. During repetitive constant intensity stimulation, the peak-to-peak LEP a...

The application of slow vertex response audiometry (cortical evoked response audiometry), mainly in the diagnosis of pseudohypoacusis, is reported. This procedure is of interest in forensic audiology.