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Visual evoked potentials to a diamond pattern can predict accommodation power more accurately than those to a checkerboard pattern.

PURPOSE: Visual evoked potentials (VEPs) are significantly influenced by the spatial frequency (SF) and angular distribution of visual stimuli. Here, we examined the effects of retinal blur on VEPs with changes in refractive power, to determine whether VEPs can be used as an index of objective accommodation (OA). METHODS: Twenty-one university students with corrected visual acuity of at least 0.0 logMAR participated in the study. Checkerboard (Check) and Check rotated 45° (Diamond) patterns were used as the visual stimuli. Pattern reversal VEPs were recorded from the uncyclopleged dominant ey…

Ocular vestibular evoked myogenic potentials: a comparison of 500 Hz toneburst and narrowband CE-Chirp stimuli in older children.

OBJECTIVE: To compare ocular vestibular evoked myogenic potential (oVEMP) response parameters in children using a 500 Hz narrowband CE-Chirp stimulus versus a 500 Hz toneburst stimulus. DESIGN: A within-subject cross-sectional design was employed. Response rate, N1 latency, P1 latency, N1-P1 amplitude and asymmetry ratio were measured for each ear for both 500 Hz NB CE-Chirp stimulus and 500 Hz TB. Stimuli were presented at 95 dB nHL via air conduction using the chin electrode montage. STUDY SAMPLE: Thirty-six participants (18 males, 18 females) aged 7 to 18 years were included. Participants

Neurophysiological and Functional Assessment in Chronic Inflammatory Demyelinating Polyradiculoneuropathy (CIDP): The Correlation Between Visual Evoked Potentials and Grip Strength.

Background/Objectives: This study investigates the relationship between Chronic Inflammatory Demyelinating Polyradiculoneuropathy (CIDP), neurophysiological markers assessed via Visual Evoked Potentials (VEPs), and functional capacity. Methods: A total of 190 participants, comprising 95 patients and 95 healthy controls, underwent specialized assessments of VEP latencies and amplitudes (P100 and N145), as well as dominant and non-dominant grip strength. Statistical analyses using independent-samples t-tests and linear regression revealed that patients exhibited significantly prolonged P100 and …

Is there an association between digital oximetry desaturation and changes in somatosensory-evoked potentials during anterior lumbar interbody fusion?

BACKGROUND: Anterior lumbar interbody fusion (ALIF) is widely employed in the treatment of degenerative lumbar disorders. However, ALIF may require manipulation or retraction of major vascular structures, thereby increasing the risk of transient ischemia. Intraoperative neurophysiological monitoring with somatosensory-evoked potentials (SSEPs), combined with digital oximetry (DO), may more effectively detect the onset of lower-extremity hypoperfusion or major vascular compromise during ALIF. METHODS: Thirty consecutive patients underwent ALIF for lumbar spondylodiscoarthropathy. Intraoperativ…

The effect of high-frequency light flicker on pattern-reversal and steady-state visual evoked potentials in healthy subjects.

PURPOSE: We investigated the effect of screen technology on visual evoked potentials (VEPs) by comparing a standard Cathode Ray Tube (CRT) screen with two Liquid Crystal Display (LCD) Light-Emitting Diode (LED) screens with differing levels of latency and high-frequency backlight flicker. METHODS: All screens were calibrated to emit the same luminance and color composition. 19 young healthy subjects underwent VEP recording using checkerboard patterns with check widths of 0.26 degrees (º), 0.51º and 1.03º. Pattern Reversal VEPs (prVEPs) were recorded from occipital (O1, Oz, and O2) electrodes …

Corticospinal tract involvement in Spinocerebellar ataxias type 1, 2 and 3 characterized by motor evoked potentials and diffusion MRI.

INTRODUCTION: Spinocerebellar ataxias (SCAs) types 1, 2, and 3 are the most common autosomal dominant SCAs, characterized by neurodegeneration in the cerebellum, brainstem, and basal ganglia. However, corticospinal tract involvement remains underexplored using combined electrophysiological and neuroimaging approaches. This study aimed to investigate the electrophysiological and imaging characteristics of SCA subtypes. METHODS: A total of 23 SCA1, 21 SCA2, and 40 SCA3 patients, along with 27 healthy controls, were enrolled. All subjects underwent neurological examination and motor evoked poten

Very low-amplitude muscle activity increases probability of motor evoked potentials in healthy individuals and in amyotrophic lateral sclerosis.

Muscle contraction increases motor evoked potential (MEP) amplitude, decreasing motor threshold (MT). Correspondingly, trials where baseline EMG amplitude exceeds a specified threshold are often rejected. We aimed to investigate the influence of motor activity below such a threshold of MEP amplitude. We retrospectively analysed TMS-EMG data collected during resting MT (RMT) measurement in 45 healthy control subjects (1794 data points) and 35 people with amyotrophic lateral sclerosis (ALS; 1229 data points). Trials with de-meaned root mean squared (RMS) EMG amplitude of >10 µV throughout the 20

Associations between self-reported interoception and resting-state EEG markers in panic disorder: heartbeat-evoked potentials and spectral power.

BACKGROUND: Panic disorder (PD) is associated with altered interoceptive experience, but it remains unclear how self-reported interoception … IA). Resting-state EEG signals were recorded during eyes-closed and eyes-open conditions. Heartbeat-evoked potentials (HEP) and relative band power (RBP) were extracted to index cardiac-related cortical processing and frequency-specific resting-state activity. Associations between self-report measures and EEG indices were examined using Pearson correlations with 95 …

Evaluation of the 2022 international consensus criteria for optic neuritis: the role of clinical features and visual evoked potentials.

BACKGROUND AND AIM: Optic neuritis (ON) diagnosis is challenging due to variable clinical presentations and the limited prospective validation of current criteria. This study evaluates the 2022 international consensus criteria for optic neuritis (ICON) criteria, and the impact of adding visual evoked potentials (VEPs) and new clinical definitions to improve diagnostic accuracy. METHODS: We introduced modifications to the ICON 2022 criteria, including a less strict clinical category allowing ON diagnosis with incomplete clinical features and the incorporation of VEPs as an additional paraclini…

Использование томографии оптической согласованности и визуального обзора позволило выявить потенциальные возможности в рамках диагностических критериев McDonald 2024 года в отношении множественного склероза.

В 2024 году были пересмотрены диагностические критерии McDonald, включая зрительный нерв в качестве пятого анатомического места в рамках CNS для диагностики множественных склерозов, а также перивентральных, яхтакорных или кортикальных, инфантеторных и позвоночных повреждений. Демонстрация распространения в космосе в настоящее время может быть обеспечена путем обнаружения типичных повреждений по крайней мере в двух из этих пяти мест. Мы анализируем доказательства, подтверждающие использование оптической последовательности томографии (OCT) и визуального потенциала (ВВП) для демонстрации зрительн

Совпадение в аннотации оригинала
The 2024 revisions of the McDonald diagnostic criteria include the optic nerve as a fifth anatomical location within the CNS for the diagnos … cations. We review the evidence supporting the use of optical coherence tomography (OCT) and visual evoked potentials (VEPs) to show optic nerve involvement in the diagnosis of multiple sclerosis. We also report consensus recommendations for their use. Provided there is no better explanation for optic nerve involvement and that rigorous quality control is applied, …

The PanGut-study: Evoked potentials following rectal balloon distention, a way of evaluating diabetic autonomic neuropathy in the gut?

AIM: There is a lack of methods for investigating the autonomic nerves of the gastrointestinal tract. Our aim was to explore a novel test measuring visceral sensory evoked potentials (EPs) in response to rapid balloon distention in the rectum and compare it to established tests for diabetic neuropathy. METHOD: Participants with longstanding type 2 diabetes, newly onset, untreated diabetes <1 year, and matched controls, were included. Tests included cardiovascular reflex tests, orthostatic blood pressure, electrical skin conductance assessment, sural nerve testing and monofilament test. The re…

Changes in motor evoked potentials after erector spinae block in scoliosis surgery-when to take pre-incision baseline recordings?

Multimodal intraoperative neurophysiological monitoring (IONM) is highly valuable in scoliosis surgeries for monitoring spinal cord function, particularly during instrumentation. Accurate timing of baseline recordings of TcMEP and SSEP is crucial, as any changes observed during surgery and instrumentation are compared to these baseline recordings. However, the impact of ultrasound-guided erector spinae block (USG-ESPB) on SSEP and TcMEP is not well-studied in scoliosis surgery. In this report, we present two cases of scoliosis surgery where bilateral two-level USG-ESPB using different concentr

Effects of Sequential Bilateral Cochlear Implantation in Children: Evidence from Speech-Evoked Cortical Potentials and Tests of Speech Perception.

INTRODUCTION: Benefits of bilateral cochlear implants (CI) may be compromised by delays to implantation of either ear. This study aimed to evaluate the effects of sequential bilateral CI use in children who received their first CI at young ages, using a clinical set-up. METHODS: One-channel cortical auditory evoked potentials and speech perception in quiet and noise were evoked at repeated times (0, 3, 6, 12 months of bilateral CI use) by unilateral and bilateral stimulation in 28 children with early-onset deafness. These children were unilaterally implanted before 3.69 years of age (mean ± S…

Simultaneous measurement of intra-epidermal electric detection thresholds and evoked potentials for observation of nociceptive processing following sleep deprivation.

Sleep deprivation has been shown to increase pain intensity and decrease pain thresholds in healthy subjects. In chronic pain patients, slee … ric stimulation. In this study, we assessed the sensitivity of nociceptive detection thresholds and evoked potentials to altered nociceptive processing after sleep deprivation in an exploratory study with 24 healthy male and 24 healthy female subjects. In each subject, we tracked nociceptive detection thresholds and recorded central evoked potentials in response to …

The effect of intraoperative lidocaine administration in a disrupted erector spinae fascial plane on intercostal transcranial motor evoked potentials.

STUDY OBJECTIVE: Erector spinae plane (ESP) blocks have been recently described for postoperative pain management following spine surgery bu … through bilateral surgically-placed ESP catheters on intraoperative intercostal transcranial motor evoked potentials (tcMEPs) in the setting of a disrupted erector spinae fascial plane in pediatric patients undergoing single-stage posterior spine fusion. MAIN RESULTS: Of the 26 patients that received bilateral surgically-placed ESP catheters for pediatric posteri …

Approach to impaired corollary discharge in patients with schizophrenia: An analysis of self-induced somatosensory evoked potentials and fields.

BACKGROUND: Difficulty in distinguishing between self-generated actions and those generated by others is a core feature of schizophrenia. This is thought to be underpinned by the failure of corollary discharge. However, few studies have investigated these events using somatosensory evoked potentials (SEPs) and somatosensory evoked magnetic fields (SEFs). METHODS: The study included 15 right-handed patients with schizophrenia and 16 healthy controls. SEP and SEF were elicited by electrical stimuli to the left median nerve at intervals of 1-3 s. In the external condition, stimuli were externall…

Changes in cortical auditory evoked potentials in response to auditory training in elderly hearing aid users: A pilot study.

OBJECTIVE: To compare the cortical auditory evoked potential responses pre-and post-Auditory Musical Training associated with hearing aid adaptation in elderly people with presbycusis. DESIGN: This is a pilot, prospective, randomized, single-blind study. STUDY SAMPLE: Eight presbiacusis elderly people between 65 and 80 years, new hearing aid users, divided into two groups participated in the study: Hearing Aid Group: use of hearing aid; and Auditory Training Group: use of hearing aid in addition to musical auditory training for 16 sessions. All participants were submitted to cortical auditor

Event-related potentials evoked by skin puncture reflect activation of Aβ fibers: comparison with intraepidermal and transcutaneous electrical stimulations.

BACKGROUND: Recently, event-related potentials (ERPs) evoked by skin puncture, commonly used for blood sampling, have received attention as a pain assessment tool in neonates. However, their latency appears to be far shorter than the latency of ERPs evoked by intraepidermal electrical stimulation (IES), which selectively activates nociceptive Aδ and C fibers. To clarify this important issue, we examined whether ERPs evoked by skin puncture appropriately reflect central nociceptive processing, as is the case with IES. METHODS: In Experiment 1, we recorded evoked potentials to the click sound p…