Based on a cognitive framework treating complex sounds as 'auditory objects', we designed a novel neuropsychological battery to probe auditory object cognition at early perceptual (sub-object), object representational (apperceptive) and semantic levels.
"Researchers have found that white noise is a useful stimulus in experiments to probe auditory responses," he notes, and scientists probing the human sense of smell might find similar uses for olfactory white.
We used probe auditory evoked potentials (AEP) recorded over each hemisphere, as an index of hemispheric activation, during the two memory conditions.
Probe auditory evoked potentials (AEP) recorded during a neutral and an upsetting memory were used to assess HEV in 28 (20 F) right-handed subjects who were either victims of childhood maltreatment (N = 12) or healthy controls.
The participants were required to repeat this mental addition four times, and then to determine whether the total that they had mentally calculated matched the number presented as a probe auditory stimulus after the white fixation point grayed (test display).
Only the location of the auditory stimulus was probed.
The most commonly used signal for probing auditory perceptual organization is a sequence of two pure tones alternating in time that, under certain conditions, can 'stream' or segregate into two sources (van Noorden, 1975; Bregman, 1990).
Our findings suggest that decoding of auditory signal relatedness may probe a generic cognitive mechanism and neural architecture underpinning frontotemporal dementia syndromes.
The potential of auditory spatial processing to probe and elucidate brain network dysfunction across the Alzheimer's disease spectrum warrants further investigation with both structural and functional neuroanatomical and ultimately, neuropathological substantiation.
Together with the music exposure, the sound pressure level (SPL) was measured in the external auditory canal with a probe-provided mini-microphone (MMP).
