Blake W. Johnson
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View article: Functional segregation of cortical hand and speech areas by frequency detuning of an intrinsic motor rhythm
Functional segregation of cortical hand and speech areas by frequency detuning of an intrinsic motor rhythm Open
This work is the first evidence for frequency detuning of an intrinsic motor rhythm in spatially contiguous regions of primary motor cortex associated with hand and speech movements, supporting a mechanism of functional segregation that ha…
View article: Functional segregation of cortical hand and speech areas by frequency detuning of an intrinsic motor rhythm
Functional segregation of cortical hand and speech areas by frequency detuning of an intrinsic motor rhythm Open
Many decades after Penfield’s (1937) classic depiction of the motor homunculus, it remains unclear how spatially contiguous and interconnected representations within human sensorimotor cortex might separate their activities to achieve the …
View article: Neural mechanisms for secondary suppression of emotional distractors: Evidence from concurrent electroencephalography–magnetoencephalography data.
Neural mechanisms for secondary suppression of emotional distractors: Evidence from concurrent electroencephalography–magnetoencephalography data. Open
Distractor suppression allows us to remain on-task in the presence of distractions by filtering task-irrelevant information from ongoing cognitive processing and responding. Electrophysiological studies have revealed that this key feature …
View article: Decoding kinematic information from beta-band motor rhythms of speech motor cortex: a methodological/analytic approach using concurrent speech movement tracking and magnetoencephalography
Decoding kinematic information from beta-band motor rhythms of speech motor cortex: a methodological/analytic approach using concurrent speech movement tracking and magnetoencephalography Open
Introduction Articulography and functional neuroimaging are two major tools for studying the neurobiology of speech production. Until now, however, it has generally not been feasible to use both in the same experimental setup because of te…
View article: A novel protocol for magnetoencephalographic mapping of speech motor control regions during speech production
A novel protocol for magnetoencephalographic mapping of speech motor control regions during speech production Open
Neuroimaging protocols for mapping of expressive speech centres employ several standard speech tasks including object naming, rhyming, and covert word production (Agarwal et al., 2019). These tasks reliably elicit activation of distributed…
View article: LiDAR Segmentation-based Adversarial Attacks on Autonomous Vehicles
LiDAR Segmentation-based Adversarial Attacks on Autonomous Vehicles Open
Autonomous vehicles utilizing LiDAR-based 3D perception systems are susceptible to adversarial attacks. This paper focuses on a specific attack scenario that relies on the creation of adversarial point clusters with the intention of foolin…
View article: Decoding kinematic information from beta-band motor rhythms of speech motor cortex: A methodological/analytic approach using concurrent speech movement tracking and magnetoencephalography
Decoding kinematic information from beta-band motor rhythms of speech motor cortex: A methodological/analytic approach using concurrent speech movement tracking and magnetoencephalography Open
Articulography and functional neuroimaging are two major tools for studying the neurobiology of speech production. Until now, however, it has generally not been feasible to use both in the same experimental setup because of technical incom…
View article: Speech Kinematics and Coordination Measured With an MEG-Compatible Speech Tracking System
Speech Kinematics and Coordination Measured With an MEG-Compatible Speech Tracking System Open
Articulography and functional neuroimaging are two major tools for studying the neurobiology of speech production. Until recently, however, it has generally not been possible to use both in the same experimental setup because of technical …
View article: Prior exposure to speech rapidly modulates cortical processing of high-level linguistic structure
Prior exposure to speech rapidly modulates cortical processing of high-level linguistic structure Open
Neural activity has been shown to track hierarchical linguistic units in connected speech and these responses can be directly modulated by changes in speech intelligibility caused by spectral degradation. In the current study, we manipulat…
View article: Concurrent MEG-articulography for investigating neuromotor control of speech articulation
Concurrent MEG-articulography for investigating neuromotor control of speech articulation Open
Articulography and functional neuroimaging are two major tools for studying the neurobiology of speech production. Until now, however, it has generally not been possible to use both in the same experimental setup because of technical incom…
View article: Lateralised cerebral processing of abstract linguistic structure in clear and degraded speech
Lateralised cerebral processing of abstract linguistic structure in clear and degraded speech Open
Providing a plausible neural substrate of speech processing and language comprehension, cortical activity has been shown to track different levels of linguistic structure in connected speech (syllables, phrases and sentences), independent …
View article: Poorer Speech Reception Threshold in Noise Is Associated With Lower Brain Volume in Auditory and Cognitive Processing Regions
Poorer Speech Reception Threshold in Noise Is Associated With Lower Brain Volume in Auditory and Cognitive Processing Regions Open
Purpose Hearing loss is associated with changes in brain volume in regions supporting auditory and cognitive processing. The purpose of this study was to determine whether there is a systematic association between hearing ability and brain…
View article: Studying Brain Function in Children Using Magnetoencephalography
Studying Brain Function in Children Using Magnetoencephalography Open
Magnetoencephalography (MEG) is a non-invasive neuroimaging technique which directly measures magnetic fields produced by the electrical activity of the human brain. MEG is quiet and less likely to induce claustrophobia compared with magne…
View article: Developmental Changes in Movement Related Brain Activity in Early Childhood
Developmental Changes in Movement Related Brain Activity in Early Childhood Open
In a previous MEG study of movement-related brain activity in preschool age children, we reported that pre-movement fields and sensorimotor cortex oscillations differed from those typically observed in adults, suggesting that maturation of…
View article: Improved Coupled Tensor Factorization with Its Applications in Health Data Analysis
Improved Coupled Tensor Factorization with Its Applications in Health Data Analysis Open
Coupled matrix and tensor factorizations have been successfully used in many data fusion scenarios where datasets are assumed to be exactly coupled. However, in the real world, not all the datasets share the same factor matrices, which mak…
View article: Non-invasive Investigation of Human Hippocampal Rhythms Using Magnetoencephalography: A Review
Non-invasive Investigation of Human Hippocampal Rhythms Using Magnetoencephalography: A Review Open
Hippocampal rhythms are believed to support crucial cognitive processes including memory, navigation, and language. Due to the location of the hippocampus deep in the brain, studying hippocampal rhythms using non-invasive magnetoencephalog…
View article: Development of face recognition: Dynamic causal modelling of MEG data
Development of face recognition: Dynamic causal modelling of MEG data Open
Electrophysiological studies of adults indicate that brain activity is enhanced during viewing of repeated faces, at a latency of about 250 ms after the onset of the face (M250/N250). The present study aimed to determine if this effect was…
View article: The functional role of human right hippocampal/parahippocampal theta rhythm in environmental encoding during virtual spatial navigation
The functional role of human right hippocampal/parahippocampal theta rhythm in environmental encoding during virtual spatial navigation Open
Low frequency theta band oscillations (4–8 Hz) are thought to provide a timing mechanism for hippocampal place cell firing and to mediate the formation of spatial memory. In rodents, hippocampal theta has been shown to play an important ro…
View article: The effects of impulsivity and proactive inhibition on reactive inhibition and the go process: insights from vocal and manual stop signal tasks
The effects of impulsivity and proactive inhibition on reactive inhibition and the go process: insights from vocal and manual stop signal tasks Open
This study measured proactive and reactive response inhibition and their relationships with self-reported impulsivity. We examined the domains of both vocal and manual responding using a stop signal task (SST) with two stop probabilities: …
View article: The Pitch Imagery Arrow Task: Effects of Musical Training, Vividness, and Mental Control
The Pitch Imagery Arrow Task: Effects of Musical Training, Vividness, and Mental Control Open
Musical imagery is a relatively unexplored area, partly because of deficiencies in existing experimental paradigms, which are often difficult, unreliable, or do not provide objective measures of performance. Here we describe a novel protoc…
View article: Development of effective connectivity in the core network for face perception
Development of effective connectivity in the core network for face perception Open
This study measured effective connectivity within the core face network in young children using a paediatric magnetoencephalograph (MEG). Dynamic casual modeling (DCM) of brain responses was performed in a group of adults ( N = 14) and a g…
View article: Beta oscillations, timing, and stuttering
Beta oscillations, timing, and stuttering Open
OPINION article Front. Hum. Neurosci., 05 January 2015Sec. Speech and Language https://doi.org/10.3389/fnhum.2014.01036