Are visual and auditory stimuli processed by similar mechanisms in the human cerebral cortex? Images can be thought of as light energy modulations over two spatial dimensions, low-level areas analyze images decomposition into frequencies. Similarly, sounds are time frequency, they identified discriminated content such modulations. An obvious question is therefore whether areas, direct analogy to represent spectro-temporal modulation acoustic stimuli. To answer this question, we measured...

Abstract The present study investigates the acoustic basis of hemispheric asymmetry for processing speech and music. Experiments on this question ideally involve stimuli that are perceptually unrelated to music, but contain characteristics both. Stimuli in previous studies were derived from samples or tonal sequences. Here we introduce a new class noise‐like sound with no resemblance music permit independent parametric variation spectral temporal complexity. Using these functional MRI...

A part of the auditory system automatically detects changes in acoustic environment. This preattentional process has been studied extensively, yet its cerebral origins have not determined with sufficient accuracy to allow comparison established anatomical and functional parcellations. Here we used event-related MRI EEG a parametric experimental design determine cortical areas individual brains that participate detection changes. Our results suggest automatic change processing consists at...

Transcranial magnetic stimulation (TMS) influences cortical processes. Recent findings indicate, however, that, in turn, the efficacy of TMS depends on state ongoing oscillations. Whereas power and phase electromyographic (EMG) activity recorded from hand muscles as well neural synchrony between cortex are known to influence effect TMS, date, no study has shown an oscillations during wakefulness. We applied single-pulse over motor motor-evoked potentials along with electroencephalogram (EEG)...

Selective attention is the mechanism that allows focusing one’s on a particular stimulus while filtering out range of other stimuli, for instance, single conversation in noisy room. Attending to one sound source rather than another changes activity human auditory cortex, but it unclear whether different acoustic features, such as voice pitch and speaker location, modulates subcortical activity. Studies using dichotic listening paradigm indicated brainstem processing may be modulated by...

ABSTRACT Communication sound processing in mouse AC is lateralized. Both left and right are highly specialised differ auditory stimulus representation, functional connectivity field topography. Previous studies have highlighted intracortical circuits that explain hemispheric preference. However, the underlying microstructure remains poorly understood. In this study, we examine structural lateralization of on basis immunohistochemically stained tissue‐cleared adult brains ( n = 11). We found...

The localization of low-frequency sounds mainly relies on the processing microsecond temporal disparities between ears, since low frequencies produce little or no interaural energy differences. overall auditory cortical response to is largely symmetrical two hemispheres, even when are lateralized. However, effects unilateral lesions in superior cortex suggest that spatial information mediated by lateralized distributed asymmetrically across hemispheres. This paper describes a functional...

Abstract Horizontal sound localization relies on the extraction of binaural acoustic cues by integration signals from two ears at level brainstem. The present experiment was aimed detecting sites in human brainstem using functional magnetic resonance imaging and a difference paradigm, which responses to sounds were compared with sum corresponding monaural sounds. also included moving condition, contrasted against spectrally energetically matched stationary condition assess structures that...

We report evidence for a context- and not stimulus-dependent functional asymmetry in the left right human auditory midbrain, thalamus, cortex response to monaural sounds. Neural activity elicited by left- right-ear stimulation was measured simultaneously cochlear nuclei, inferior colliculi (ICs), medial geniculate bodies (MGBs), cortices (ACs) 2 magnetic resonance imaging experiments. In experiment 1, pulsed noise presented monaurally either ear, or binaurally, simulating moving sound...

One of the functions brain is to predict sensory consequences our own actions. In auditory processing, self-initiated sounds evoke a smaller response than passive sound exposure same sequence. Previous work suggests that this attenuation reflects predictive mechanism differentiate one's actions from other input, which seems form basis for sense agency (recognizing oneself as agent movement). This study addresses question whether responses can be explained by activity involved in movement...

The aim of the current study was to measure brain's response auditory motion using electroencephalography (EEG) gain insight into mechanisms by which hemispheric lateralization for spatial processing is established in human brain. onset left- or rightward an otherwise continuous sound found elicit a large response, appeared arise from higher-level nonprimary areas. This strongly lateralized hemisphere contralateral direction motion. latencies suggest that ipsilateral leftward produced...

The purpose of our study was to investigate the ability process achromatic and short-wavelength-sensitive cone (S-cone)-isolating (blue-yellow) stimuli in blind visual field hemispherectomized subjects demonstrate that blindsight is mediated by a collicular pathway independent S-cone inputs. Blindsight has been described as respond without conscious awareness [Weiskrantz, L., Warrington, E. K., Sanders, M. D., & Marshall, J. Visual capacity hemianopic following restricted occipital ablation....

While functional connectivity in the human cortex has been increasingly studied, its relationship to cortical representation of sensory features not documented as much. We used magnetic resonance imaging demonstrate that voxel-by-voxel intrinsic (FC) is selective frequency preference voxels auditory cortex. Thus, FC was significantly higher for with similar tuning than dissimilar functions. Frequency-selective FC, measured via correlation residual hemodynamic activity, explained by generic...

The scalp-recorded frequency-following response (FFR) is a measure of the auditory nervous system's representation periodic sound, and may serve as marker training-related enhancements, behavioural deficits, clinical conditions. However, FFRs healthy normal subjects show considerable variability that remains unexplained. We investigated whether FFR frequency content complex tone related to perception pitch fundamental frequency. strength in 39 people with hearing was assessed when they...

Auditory cortex (AC) contains several primary-like, or "core," fields, which receive thalamic input and project to non-primary "belt" fields. In humans, the organization layout of core belt auditory fields are still poorly understood, most neuroimaging studies rely on macroanatomical criteria, rather than functional localization distinct A myeloarchitectonic method has been suggested recently for distinguishing between in humans (Dick F, Tierney AT, Lutti A, Josephs O, Sereno MI, Weiskopf N....

The spontaneous ability to entrain meter periodicities is central music perception and production across cultures. There increasing evidence that this involves selective neural responses meter-related frequencies. This phenomenon has been observed in the human auditory cortex, yet it could be product of evolutionarily older lower-level properties brainstem neurons, as suggested by recent recordings from rodent midbrain. We addressed question taking advantage a new method simultaneously...

The adult auditory system adapts to changes in spectral cues for sound localization. This plasticity was demonstrated by modifying the shape of pinnae with molds. Previous studies investigating this adaptation process have focused on effects learning one additional set cues. However, multiple pinna shapes could reveal limitations system's ability encode discrete spectral-to-spatial mappings without interference and thus help determine mechanism underlying cue relearning. In present study,...

Perception of rhythm significantly impacts various aspects daily life, including engaging with music, discerning speech prosody nuances, and coordinating physical activities like walking sports. Numerous studies in cognitive sciences have highlighted that human rhythmic synchronization is more precise when responding to auditory stimuli than visual ones the timing cues are identical. However, deaf individuals were shown display a heightened proficiency synchronizing their movements cues,...

Pitch discrimination tasks typically engage the superior temporal gyrus and right inferior frontal gyrus. It is currently unclear whether these regions are equally involved in processing of incongruous notes melodies, which requires representation musical structure (tonality) addition to pitch discrimination. To this aim, 14 participants completed two while undergoing functional magnetic resonance imaging, one they had identify a change series non-melodic repeating tones second an note tonal...