Auditory Stimuli Research Articles

Emparejamiento verbal para transferir funciones por condicionamiento clásico: un estudio experimental

The transfer of functions is key to explain the change in behavior resulting from a therapeutic intervention and has traditionally been explained based on operant conditioning processes. This exploratory study sought to find experimental evidence of transfer of functions using classical conditioning procedures. Three conditioned visual stimuli (EC1, EC2 and EC3) and one aversive unconditioned (EI) auditory stimulus were used. EC1 was associated with EC2, EC3 with EI and then verbally paired EC1 with EC3 seeking to transfer the function of the EI to EC2 without ever having been directly associated. Electrodermal activity was measured in four adults and a transfer test was performed. We found only some evidence of transfer of the function of the elicitor EI of electrodermal activity (a chirp) to a visual image (EC2) through the pairing of the previously conditioned words “Antonio” (EC1) and “chirp” (EC3). This exploratory finding tentatively suggests that Pavlovian conditioning could explain some therapeutic processes, related to the effect that the verbal interaction between client and therapist has on the behavior of the former and its control outside the clinic, completing the traditional explanations based on operant conditioning. However, it is insufficient and limitations and suggestions for the continuity of this line of research are discussed.

Using Pupil Diameter for Psychological Resilience Assessment in Medical Students Based on SVM and SHAP Model.

Effectively assessing psychological resilience for medical students is vital for identifying at-risk individuals and developing tailored interventions. At present, few studies have combined physiological indexes of the human body and machine learning for psychological resilience assessment. This study presents a novel approach that employs pupil diameter features and machine learning to predict psychological resilience risk objectively. Firstly, we designed a stimulus paradigm (via auditory and visual stimuli) and collected pupil diameter data from participants using eye-tracking technology. Secondly, the pupil data was preprocessed, including linear interpolation, blink detection, and subtractive baseline correction. Thirdly, statistical metrics were extracted and optimal feature subsets were obtained by Recursive Feature Elimination with Cross-Validation (RFECV). Subsequently, the classification models, including Logistic Regression (LR), Random Forest (RF), Support Vector Machine (SVM), and eXtreme Gradient Boosting (XGBoost), were trained. The experimental results show that the SVM model has the best performance, and its balance accuracy, recall, and AUC reach 0.906, 0.89, and 0.932, respectively. Finally, we leveraged the Shapley additive explanation (SHAP) model for interpretability analysis. It revealed auditory stimuli have a more significant effect than visual stimuli in psychological resilience assessment. These findings suggested that pupil diameter could be a vital metric for assessing psychological resilience.

The neural network of sensory attenuation: A neuroimaging meta-analysis.

Sensory attenuation refers to the reduction in sensory intensity resulting from self-initiated actions compared to stimuli initiated externally. A classic example is scratching oneself without feeling itchy. This phenomenon extends across various sensory modalities, including visual, auditory, somatosensory, and nociceptive stimuli. The internal forward model proposes that during voluntary actions, an efferent copy of the action command is sent out to predict sensory feedback. This predicted sensory feedback is then compared with the actual sensory feedback, leading to the suppression or reduction of sensory stimuli originating from self-initiated actions. To further elucidate the neural mechanisms underlying sensory attenuation effect, we conducted an extensive meta-analysis of functional magnetic resonance imaging (fMRI) and positron emission tomography (PET) studies. Utilizing activation likelihood estimation (ALE) analysis, our results revealed significant activations in a prominent cluster encompassing the right superior temporal gyrus (rSTG), right middle temporal gyrus (rMTG), and right insula when comparing external-generated with self-generated conditions. Additionally, significant activation was observed in the right anterior cerebellum when comparing self-generated to external-generated conditions. Further analysis using meta-analytic connectivity modeling (MACM) unveiled distinct brain networks co-activated with the rMTG and right cerebellum, respectively. Based on these findings, we propose that sensory attenuation arises from the suppression of reflexive inputs elicited by self-initiated actions through the internal forward modeling of a cerebellum-centered action prediction network, enabling the "sensory conflict detection" regions to effectively discriminate between inputs resulting from self-induced actions and those originating externally.

The Relationship between Basal Ganglia Volume and Audiovisual Reaction Time in Turkish Elite Athletes

Background: In this study involving young adult elite athletes and healthy sedentary individuals, volumetric analyses were performed on basal ganglia (BG) involved in the coordination of motor movements. Aims and Objectives: In a group of athletes with high coordination speed, potential relationship between BG volumes and audiovisual reaction time of acquired-trained hand movements was explored by examining whether these individuals had significant differences in terms of BG volumes. Materials and Methods: Nineteen elite athletes aged between 19 and 25 years (9 male and 10 female) and 20 sedentary subjects (10 male, 10 female) were included. Gender, age, height, weight, and body-mass index (BMI) were recorded. In each group, audiovisual reaction time and stereological basal ganglia volumes were assessed and statistically analyzed. Results: Elite athletes react more rapidly to auditory stimuli than visual stimuli. As compared to sedentary individuals, elite athletes exhibited significantly shorter visual reaction time and only numerically shorter (statistically insignificant) visual reaction time. Left BG volume was higher in both groups, compared to right side). Conclusion: Our data may contribute to the construction of a database of normal BG morphology and provide useful information for clinicians and athletes.

Analysis of an Integrated QEEG-Neurofeedback System Utilizing Active Stimuli for Non-Pharmacological Intervention in Enhancing Neurobehavioral Function

Quantitative Electroencephalogram (QEEG) and Neurofeedback (NF) are employed in the diagnosis and treatment of neurobehavioral deficits associated with various clinical conditions. These approaches enable the exploration of EEG usage within the context of neurobehavioral electrophysiology. This study aims to elucidate the fundamental evidence supporting NF and to outline strategies for its further development and application in ameliorating neurobehavioral deficits. Numerous research studies have demonstrated the efficacy of NF in enhancing neurobehavioral functions, including attention, language, memory, visuospatial abilities, and executive function. This study intends to develop an NF system that includes the establishment of a robust approach to QEEG transformation and database. The closed-loop QEEG-NF system under development incorporates active visual and auditory stimuli that leverage stochastic phenomena. The efficacy of the QEEG NF treatment was confirmed with a statistically significant increase in alpha brain wave percentages post-treatment (p = 0.018), indicating that the system effectively enhances alpha brain wave production.

Current Trends in the Treatment of Misophonia

Misophonia is a disorder characterized by emotional and physiological responses that occur in response to certain auditory stimuli. Visual, tactile, and olfactory stimuli, primarily oral and nasal sounds such as eating, nose, and respiratory sounds, reveal misophonic responses. People with misophonia may have difficulty in social interactions, and work or school performance may be adversely affected. Misophonia symptoms can also cause anxiety, depression, and other mental health problems. Physiological reactions in the body, such as pain, sweating, tachycardia, hot flashes, and breathing difficulties, negatively affect people's physical health. For this reason, people's physical and mental health and quality of life are significantly affected. The absence of agreed diagnostic criteria for the diagnosis of misophonia and the lack of sufficient data to classify it as a psychiatric disorder has led to the lack of validated treatment guidelines. However, there are treatment recommendations discussed in the literature for misophonia, which has a prevalence of 20% in a limited number of studies and negatively affects the functionality of the individual. In the management of misophonia, tinnitus re-education therapy (TRT) was used as audiological treatment, antidepressants, and anxiolytics were used as pharmacological treatment and cognitive behavioral therapies were used as therapy. Other suggested treatment recommendations are neural remodeling technique, sequential remodeling hypnotherapy, trauma prevention technique, and trauma and tension reduction exercises. This review aims to present the treatment approaches available in the literature together and to understand the need for experimental evidence for treatment methods.

DESIGNING FOR THE SENSES: MULTISENSORY APPROACHES IN THERAPEUTIC CLINICAL SPACES

Spatial design significantly influences interactions with the built environment, engaging senses through visual, auditory, and tactile stimuli. However, in therapeutic clinical settings, the sensory experience is often overlooked in favor of aesthetic considerations, limiting the understanding of user responses to spatial cues. This study investigates the role and impact of multisensory design on user responses in therapeutic clinical environments. By analyzing design parameters such as lighting, acoustics, materials, and textures, the research aims to establish a framework for creating therapeutic clinical spaces that prioritize multisensory stimulation. Through case studies, interviews, and surveys, the study assesses user perceptions and psychological responses to different sensory stimuli in clinical settings. The findings indicate a preference for environments that engage multiple senses, with factors such as layout, color tones, forms, lighting, and finishes playing crucial roles in shaping user experiences. The proposed framework offers practical guidance for designers and architects, emphasizing the importance of sensory design in enhancing interactions between users and clinical environments, ultimately contributing to a more holistic and immersive therapeutic experience.

UPAYA MENINGKATKAN PRESTASI BELAJAR MELALUI MEDIA AUDIO VISUAL GERAK KELAS V SEKOLAH DASAR SANTO. PETRUS MEDAN

Through two cycles of Classroom Action Research (CAR), this study assesses the use of audio-visual materials to enhance the learning achievement of fifth-grade students at St. Elementary School. Data were collected using pretests and posttests. In the first cycle, students had an average score of 59, classified as "developing." However, following the utilization of audio-visual materials, including PowerPoint presentations and films, the average score rose to 91 in the second cycle, an increase of 32 points, and was classified as "very good." Apart from improving academic performance, the utilization of audio-visual materials also increased student engagement. These materials provide visual and auditory stimuli, aiding comprehension and fostering participation and conversation in the classroom. The utility of audio-visual multimedia opens doors for more dynamic and effective learning approaches.

Cross-linguistic perception of Spanish intonation by Chinese speakers: Effects of linguistic experience and prosodic features

This study aims to explore the cross-linguistic perception of Spanish intonation patterns and the role of linguistic experience and prosodic features in identifying the question-statement contrasts. To this end, 43 Spanish native listeners and 75 Chinese learners of Spanish were presented with auditory stimuli in a gating paradigm for the recognition of sentence types. The results showed that listeners’ perception of target intonational contours was highly dependent on their language experience. Although Spanish listeners outperformed Chinese learners in perceiving different intonational cues, most Chinese learners were able to correctly identify sentence types after hearing the initial F0 peak due to the positive transfer of their tonal processing ability in their native language. In addition, our data revealed that the position of the final stressed syllable might also be a relevant factor for discriminating the sentence type depending on the length of the utterance. Overall, the findings seem to suggest a complex integration mechanism for cross-linguistic intonation perception, in which listeners’ language specificity and the prosodic structures of the materials should be accounted for evaluating non-native auditory performance.

Enhancing interoceptive sensibility through exteroceptive–interoceptive sensory substitution

Exploring a novel approach to mental health technology, this study illuminates the intricate interplay between exteroception (the perception of the external world), and interoception (the perception of the internal world). Drawing on principles of sensory substitution, we investigated how interoceptive signals, particularly respiration, could be conveyed through exteroceptive modalities, namely vision and hearing. To this end, we developed a unique, immersive multisensory environment that translates respiratory signals in real-time into dynamic visual and auditory stimuli. The system was evaluated by employing a battery of various psychological assessments, with the findings indicating a significant increase in participants' interoceptive sensibility and an enhancement of the state of flow, signifying immersive and positive engagement with the experience. Furthermore, a correlation between these two variables emerged, revealing a bidirectional enhancement between the state of flow and interoceptive sensibility. Our research is the first to present a sensory substitution approach for substituting between interoceptive and exteroceptive senses, and specifically as a transformative method for mental health interventions, paving the way for future research.

Shredding artifacts: extracting brain activity in EEG from extreme artifacts during skateboarding using ASR and ICA.

To understand brain function in natural real-world settings, it is crucial to acquire brain activity data in noisy environments with diverse artifacts. Electroencephalography (EEG), while susceptible to environmental and physiological artifacts, can be cleaned using advanced signal processing techniques like Artifact Subspace Reconstruction (ASR) and Independent Component Analysis (ICA). This study aims to demonstrate that ASR and ICA can effectively extract brain activity from the substantial artifacts occurring while skateboarding on a half-pipe ramp. A dual-task paradigm was used, where subjects were presented with auditory stimuli during skateboarding and rest conditions. The effectiveness of ASR and ICA in cleaning artifacts was evaluated using a support vector machine to classify the presence or absence of a sound stimulus in single-trial EEG data. The study evaluated the effectiveness of ASR and ICA in artifact cleaning using five different pipelines: (1) Minimal cleaning (bandpass filtering), (2) ASR only, (3) ICA only, (4) ICA followed by ASR (ICAASR), and (5) ASR preceding ICA (ASRICA). Three skateboarders participated in the experiment. Results showed that all ICA-containing pipelines, especially ASRICA (69%, 68%, 63%), outperformed minimal cleaning (55%, 52%, 50%) in single-trial classification during skateboarding. The ASRICA pipeline performed significantly better than other pipelines containing ICA for two of the three subjects, with no other pipeline performing better than ASRICA. The superior performance of ASRICA likely results from ASR removing non-stationary artifacts, enhancing ICA decomposition. Evidenced by ASRICA identifying more brain components via ICLabel than ICA alone or ICAASR for all subjects. For the rest condition, with fewer artifacts, the ASRICA pipeline (71%, 82%, 75%) showed slight improvement over minimal cleaning (73%, 70%, 72%), performing significantly better for two subjects. This study demonstrates that ASRICA can effectively clean artifacts to extract single-trial brain activity during skateboarding. These findings affirm the feasibility of recording brain activity during physically demanding tasks involving substantial body movement, laying the groundwork for future research into the neural processes governing complex and coordinated body movements.

Chronic pain – A maladaptive compensation to unbalanced hierarchical predictive processing

The ability to perceive pain presents an interesting evolutionary advantage to adapt to an ever-changing environment. However, in the case of chronic pain (CP), pain perception hinders the capacity of the system to adapt to changing sensory environments. Similar to other chronic perceptual disorders, CP is also proposed to be a maladaptive compensation to aberrant sensory predictive processing. The local-global oddball paradigm relies on learning hierarchical rules and processing environmental irregularities at a local and global level. Prediction errors (PE) between actual and predicted input typically trigger an update of the forward model to limit the probability of encountering future PEs. It has been hypothesised that CP hinders forward model updating, reflected in increased local deviance and decreased global deviance. In the present study, we used the local-global paradigm to examine how CP influences hierarchical learning relative to healthy controls. As hypothesised, we observed that deviance in the stimulus characteristics evoked heightened local deviance and decreased global deviance of the stimulus-driven PE. This is also accompanied by respective changes in theta phase locking that is correlated with the subjective pain perception. Changes in the global deviant in the stimulus-driven-PE could also be explained by dampened attention-related responses. Changing the context of the auditory stimulus did not however show a difference in the context-driven PE. These findings suggest that CP is accompanied by maladaptive forward model updating where the constant presence of pain perception disrupts local deviance in non-nociceptive domains. Furthermore, we hypothesise that the auditory-processing based biomarker identified here could be a marker of domain-general dysfunction that could be confirmed by future research.

The effectiveness of nurses’ psychosocial interventions for sensory deprivation in intensive care patients: a systematic review and meta-analysis

ObjectiveThis systematic review and meta-analysis aimed to assess the effectiveness of nurses’ psychosocial interventions for addressing sensory deprivation in intensive care units (ICUs).Materials and methodsA comprehensive search of PubMed, Web of Science, EBSCOhost, Google Scholar, CİNAHL, Embase, Cochrane Library, and YÖK Thesis Center databases was conducted from August 2023 to May 2024, without any temporal restrictions. In addition, a physical search was made in the university library for grey literature.ResultsThe study revealed that nurses’ psychosocial interventions significantly improved patients’ level of consciousness (SMD = 1.042, %95 CI = 0.716 to 1.369; Z = 6.25; p < .05) and sleep quality in ICUs (SMD=1.21, 95% CI= 0.232 to 1.810; Z = 2.49; p < .05). The effectiveness of psychosocial interventions varied based on the type of intervention, patient age, ICU type, patient group, and intervention duration. Notably, auditory stimuli and aromatherapy demonstrated particularly high effect sizes, significantly enhancing patients’ levels of consciousness and sleep quality.ConclusionIn conclusion, psychosocial interventions aimed at reducing sensory deprivation in intensive care units exert beneficial effects on individuals, notably enhancing their level of consciousness and improving sleep quality.

Task-based default mode network connectivity predicts cognitive impairment and negative symptoms in first-episode schizophrenia.

Individuals diagnosed with schizophrenia (SZ) demonstrate difficulty distinguishing between internally and externally generated stimuli. These aberrations in "source monitoring" have been theorized as contributing to symptoms of the disorder, including hallucinations and delusions. Altered connectivity within the default mode network (DMN) of the brain has been proposed as a mechanism through which discrimination between self-generated and externally generated events is disrupted. Source monitoring abnormalities in SZ have additionally been linked to impairments in selective attention and inhibitory processing, which are reliably observed via the N100 component of the event-related brain potential elicited during an auditory paired-stimulus paradigm. Given overlapping constructs associated with DMN connectivity and N100 in SZ, the present investigation evaluated relationships between these measures of disorder-related dysfunction and sought to clarify the nature of task-based DMN function in SZ. DMN connectivity and N100 measures were assessed using EEG recorded from SZ during their first episode of illness (N = 52) and demographically matched healthy comparison participants (N = 25). SZ demonstrated less evoked theta-band connectivity within DMN following presentation of pairs of identical auditory stimuli than HC. Greater DMN connectivity among SZ was associated with better performance on measures of sustained attention (p = .03) and working memory (p = .09), as well as lower severity of negative symptoms, though it was not predictive of N100 measures. Together, present findings provide EEG evidence of lower task-based connectivity among first-episode SZ, reflecting disruptions of DMN functions that support cognitive processes. Attentional processes captured by N100 appear to be supported by different neural mechanisms.

The effect of early postnatal auditory stimulation on outcomes in preterm infants.

Preterm infants are deprived of in utero sensory stimulation during the third trimester, an important period of central nervous system development. As a result, maturational trajectories are often reduced in infants born preterm. One such system affected is the brain including the auditory and respiratory control pathways. During normal pregnancy the intrauterine environment attenuates external auditory stimuli while exposing the fetus to filtered maternal voice, intra-abdominal sounds, and external stimuli. In contrast, during the third trimester of development, preterm infants are exposed to a vastly different soundscape including non-attenuated auditory sounds and a lack of womb related stimuli, both of which may affect postnatal brain maturation. Therefore, fostering a nurturing postnatal auditory environment during hospitalization may have a significant impact on related outcomes of preterm infants. Studies using a range of postnatal auditory stimulations have suggested that exposure to sounds or lack thereof can have a significant impact on outcomes. However, studies are inconsistent with sound levels, duration of exposure to auditory stimuli, and the gestational age at which infants are exposed. IMPACT: Auditory stimulation can provide a low cost and low risk intervention to stabilize respiration, improve neuronal maturation and reduce long-term sequelae in preterm infants. The potential benefits of auditory stimulation are dependent on the type of sound, the duration of exposure and age at time of exposure. Future studies should focus on the optimal type and duration of sound exposure and postnatal developmental window to improve outcomes.

The vestigial pinna-orienting system in humans briefly suppresses superior auricular muscle activity during reflexive orienting toward auditory stimuli.

The vestigial pinna-orienting system in humans is capable of increasing the activity of several auricular muscles in response to lateralized transient auditory stimuli. For example, transient increases in electromyographic activity in the posterior auricular muscle (PAM) to an attention-capturing stimulus have been documented. For the current study, surface electromyograms (EMGs) were recorded from the PAMs and superior auricular muscles (SAMs) of 10 normal-hearing participants. During the experiments, lateralized transient auditory stimuli, such as a crying baby, a shattering vase, or the participant's first names, were presented. These transient stimuli were either presented in silence or when participants actively listened to a podcast. Although ipsilateral PAM activity increased in response to transient stimuli, the SAM displayed the opposite behavior, i.e., a brief, ipsilateral suppression of activity. This suppression of ipsilateral SAM activity was more frequent on the right (75%) than left side (35%), whereas an ipsilateral PAM increase was roughly equal in prevalence on the two sides (left: 90%, right: 95%). During the active listening task, SAM suppression on the right ear was significantly larger in response to ipsilateral stimuli, compared with contralateral ones (P = 0.002), whereas PAM activity increased significantly (P = 0.002). Overall, this study provides evidence of a systematic transient suppression of the SAM during exogenous attention. This could suggest a more complex system than previously assumed, as the presence of synchronized excitatory and inhibitory components in different auricular muscles points toward a coordinated attempt at reflexively orienting the pinna toward a sound.NEW & NOTEWORTHY This study provides evidence that two auricular muscles in humans, the posterior and superior auricular muscles (PAM, SAM), react fundamentally different to lateralized transient auditory stimuli, especially during active listening. Although the PAM reacts with a transient increase in ipsilateral activity, ongoing ipsilateral SAM activity is briefly suppressed at the same time. This indicates the presence of a more complex and nuanced pinna-orienting system, with synchronized excitatory and inhibitory components in humans, than previously suspected.

Electrocortical activity associated with movement-related fear: a methodological exploration of a threat-conditioning paradigm involving destabilising perturbations during quiet standing

Musculoskeletal trauma often leads to lasting psychological impacts stemming from concerns of future injuries. Often referred to as kinesiophobia or re-injury anxiety, such concerns have been shown to hinder return to physical activity and are believed to increase the risk for secondary injuries. Screening for re-injury anxiety is currently restricted to subjective questionnaires, which are prone to self-report bias. We introduce a novel approach to objectively identify electrocortical activity associated with the threat of destabilising perturbations. We aimed to explore its feasibility among non-injured persons, with potential future implementation for screening of re-injury anxiety. Twenty-three participants stood blindfolded on a translational balance perturbation platform. Consecutive auditory stimuli were provided as low (neutral stimulus [CS–]) or high (conditioned stimulus [CS+]) tones. For the main experimental protocol (Protocol I), half of the high tones were followed by a perturbation in one of eight unpredictable directions. A separate validation protocol (Protocol II) requiring voluntary squatting without perturbations was performed with 12 participants. Event-related potentials (ERP) were computed from electroencephalography recordings and significant time-domain components were detected using an interval-wise testing procedure. High-amplitude early contingent negative variation (CNV) waves were significantly greater for CS+ compared with CS– trials in all channels for Protocol I (> 521-800ms), most prominently over frontal and central midline locations (P ≤ 0.001). For Protocol II, shorter frontal ERP components were observed (541-609ms). Our test paradigm revealed electrocortical activation possibly associated with movement-related fear. Exploring the discriminative validity of the paradigm among individuals with and without self-reported re-injury anxiety is warranted.

Associations of aerobic and muscular fitness with sustained overt attention and discrimination abilities in preadolescents

ABSTRACT Sustained overt attention and discrimination abilities – representing an individual’s capability to focus on a target or event by directing the eyes towards it and to discern between different visual and auditory stimuli – are crucial in school activities such as reading and problem-solving. Research has highlighted a link between these cognitive abilities and children’s physical fitness. However, some aspects have received limited attention. To fill this literature gap, we investigated the associations of two fitness domains, namely aerobic and muscular fitness, with cognitive processes that necessitate sustained overt attention and discrimination abilities in preadolescents. A total of 176 elementary school students (70 girls, mean age = 11.17 years, standard deviation = 0.7) were instructed to perform half-mile run to evaluate their aerobic fitness and the 60-second sit-up and standing broad jump tests to evaluate their muscular fitness. Additionally, we adopted the visual pursuit test and determination test to assess sustained overt attention and discrimination abilities, respectively. Our results revealed that aerobic fitness was the strongest predictor of sustained overt attention performance, whereas muscular fitness was the strongest predictor of discrimination performance. These findings provide new insights into the unique associations of fitness domains with sustained overt attention and discrimination abilities in preadolescents.

A closed-loop auditory stimulation approach selectively modulates alpha oscillations and sleep onset dynamics in humans.

Alpha oscillations play a vital role in managing the brain's resources, inhibiting neural activity as a function of their phase and amplitude, and are changed in many brain disorders. Developing minimally invasive tools to modulate alpha activity and identifying the parameters that determine its response to exogenous modulators is essential for the implementation of focussed interventions. We introduce Alpha Closed-Loop Auditory Stimulation (αCLAS) as an EEG-based method to modulate and investigate these brain rhythms in humans with specificity and selectivity, using targeted auditory stimulation. Across a series of independent experiments, we demonstrate that αCLAS alters alpha power, frequency, and connectivity in a phase, amplitude, and topography-dependent manner. Using single-pulse-αCLAS, we show that the effects of auditory stimuli on alpha oscillations can be explained within the theoretical framework of oscillator theory and a phase-reset mechanism. Finally, we demonstrate the functional relevance of our approach by showing that αCLAS can interfere with sleep onset dynamics in a phase-dependent manner.

Tracking the Misallocation and Reallocation of Spatial Attention toward Auditory Stimuli.

Completely ignoring a salient distractor presented concurrently with a target is difficult, and sometimes attention is involuntarily attracted to the distractor's location (attentional capture). Employing the N2ac component as a marker of attention allocation toward sounds, in this study we investigate the spatiotemporal dynamics of auditory attention across two experiments. Human participants (male and female) performed an auditory search task, where the target was accompanied by a distractor in two-third of the trials. For a distractor more salient than the target (Experiment 1), we observe not only a distractor N2ac (indicating attentional capture) but the full chain of attentional dynamics implied by the notion of attentional capture, namely, (1) the distractor captures attention before the target is attended, (2) allocation of attention to the target is delayed by distractor presence, and (3) the target is attended after the distractor. Conversely, for a distractor less salient than the target (Experiment 2), although responses were delayed, no attentional capture was observed. Together, these findings reveal two types of spatial attentional dynamics in the auditory modality (distraction with and without attentional capture).