The Experts below are selected from a list of 15249 Experts worldwide ranked by ideXlab platform
Luis C Populin - One of the best experts on this subject based on the ideXlab platform.
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Neural Correlate of auditory spatial attention allocation in the superior colliculus
Journal of Neurophysiology, 2018Co-Authors: Abigail Z Rajala, Rick L Jenison, Luis C PopulinAbstract:These results show for the first time a Neural Correlate of attention capture and inhibition of return in response to auditory stimuli in the superior colliculus of the head-unrestrained monkey.
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Neural Correlate of auditory spatial attention allocation in the superior colliculus
Journal of Neurophysiology, 2018Co-Authors: Abigail Z Rajala, Rick L Jenison, Luis C PopulinAbstract:This study is the physiological complement to previous behavioral work that demonstrated that rhesus monkeys are able to allocate attention about the surrounding space based on brief, broadband auditory cues. Single-unit recordings were taken from the intermediate layers of the superior colliculus (iSC) while the subjects oriented to visual and auditory targets in the context of a cuing task with their heads unrestrained. The results show a correlation between behavioral manifestations of attention allocation, attention capture and inhibition of return, and modulation of target-evoked responses in single iSC neurons. NEW & NOTEWORTHY These results show for the first time a Neural Correlate of attention capture and inhibition of return in response to auditory stimuli in the superior colliculus of the head-unrestrained monkey.
Abigail Z Rajala - One of the best experts on this subject based on the ideXlab platform.
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Neural Correlate of auditory spatial attention allocation in the superior colliculus
Journal of Neurophysiology, 2018Co-Authors: Abigail Z Rajala, Rick L Jenison, Luis C PopulinAbstract:These results show for the first time a Neural Correlate of attention capture and inhibition of return in response to auditory stimuli in the superior colliculus of the head-unrestrained monkey.
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Neural Correlate of auditory spatial attention allocation in the superior colliculus
Journal of Neurophysiology, 2018Co-Authors: Abigail Z Rajala, Rick L Jenison, Luis C PopulinAbstract:This study is the physiological complement to previous behavioral work that demonstrated that rhesus monkeys are able to allocate attention about the surrounding space based on brief, broadband auditory cues. Single-unit recordings were taken from the intermediate layers of the superior colliculus (iSC) while the subjects oriented to visual and auditory targets in the context of a cuing task with their heads unrestrained. The results show a correlation between behavioral manifestations of attention allocation, attention capture and inhibition of return, and modulation of target-evoked responses in single iSC neurons. NEW & NOTEWORTHY These results show for the first time a Neural Correlate of attention capture and inhibition of return in response to auditory stimuli in the superior colliculus of the head-unrestrained monkey.
Okihide Hikosaka - One of the best experts on this subject based on the ideXlab platform.
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a Neural Correlate of motivational conflict in the superior colliculus of the macaque
Journal of Neurophysiology, 2008Co-Authors: Masaki Isoda, Okihide HikosakaAbstract:Behavior is controlled by both external instructions and internal motives, but the actions demanded by each may be different. A common consequence of such a conflict is a delay in decision making and subsequent motor responses. It is unknown, however, what Neural mechanisms underlie motivational conflict and associated response delay. To answer this question, we recorded single-neuron activity in the superior colliculus (SC) as macaque monkeys performed a visually guided, asymmetrically rewarded saccade task. A peripheral spot of light at one of two opposing positions was illuminated to indicate a saccade target. In a given block of trials, one position was associated with a big reward and the other with a small reward. The big-reward position was alternated across blocks. Behavioral analyses revealed that small-reward trials created a conflict between the instructed saccade to one position and the internally motivated, yet invalid saccade to the opposite position. We found that movement neurons in the SC temporally exhibited bursting activity after the appearance of the small-reward target opposite their movement field. This transient activity predicted the amount of response delay for upcoming saccades. Our data suggest that motivational conflict activates movement neurons in both colliculi, thereby delaying saccade initiation through intercollicular inhibitory interactions.
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a Neural Correlate of response bias in monkey caudate nucleus
Nature, 2002Co-Authors: Johan Marc Jose Lauwereyns, Katsumi Watanabe, Okihide HikosakaAbstract:Primates are equipped with Neural circuits in the prefrontal cortex1,2,3,4,5,6, the parietal cortex7 and the basal ganglia6,8,9,10,11 that predict the availability of reward during the performance of behavioural tasks. It is not known, however, how reward value is incorporated in the control of action. Here we identify neurons in the monkey caudate nucleus that create a spatially selective response bias depending on the expected gain. In behavioural tasks, the monkey had to make a visually guided eye movement in every trial, but was rewarded for a correct response in only half of the trials. Reward availability was predictable on the basis of the spatial position of the visual target. We found that caudate neurons change their discharge rate systematically, even before the appearance of the visual target, and usually fire more when the contralateral position is associated with reward. Strong anticipatory activity of neurons with a contralateral preference is associated with decreased latency for eye movements in the contralateral direction. We conclude that this neuronal mechanism creates an advance bias that favours a spatial response when it is associated with a high reward value.
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A Neural Correlate of oculomotor sequences in supplementary eye field.
Neuron, 2002Co-Authors: Masako Matsuzawa, Okihide HikosakaAbstract:Complex learned motor sequences can be composed of a combination of a small number of elementary actions. To investigate how the brain represents such sequences, we devised an oculomotor sequence task in which the monkey had to choose the target solely by the sequential context, not by the current stimulus combination. We found that many neurons in the supplementary eye field (SEF) became active with a specific target direction (D neuron) or a specific target/distractor combination (C neuron). Furthermore, such activity was often selective for one among several sequences that included the combination (S neuron). These results suggest that the SEF contributes to the generation of saccades in many learned sequences.
Stefan Wiens - One of the best experts on this subject based on the ideXlab platform.
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the early but not the late Neural Correlate of auditory awareness reflects lateralized experiences
Neuropsychologia, 2021Co-Authors: Rasmus Eklund, Billy Gerdfeldter, Stefan WiensAbstract:Abstract Theories disagree as to whether it is the early or the late Neural Correlate of awareness that plays a critical role in phenomenal awareness. According to recurrent processing theory, early activity in primary sensory areas corresponds closely to phenomenal awareness. In support, research with electroencephalography found that in the visual and somatosensory modality, an early Neural Correlate of awareness is contralateral to the perceived side of stimulation. Thus, early activity is sensitive to the perceived side of visual and somatosensory stimulation. Critically, it is unresolved whether this is true also for hearing. In the present study (N = 26 students), Bayesian analyses showed that the early Neural Correlate of awareness (auditory awareness negativity, AAN) was stronger for contralateral than ipsilateral electrodes whereas the late Correlate of auditory awareness (late positivity, LP) was not lateralized. These findings demonstrate that the early but not the late Neural Correlate of auditory awareness reflects lateralized experiences. Thus, these findings imply that AAN is a more suitable NCC than LP because it Correlates more closely with lateralized experiences.
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Visual awareness negativity is an early Neural Correlate of awareness: A preregistered study with two Gabor sizes
Cognitive Affective & Behavioral Neuroscience, 2018Co-Authors: Rasmus Eklund, Stefan WiensAbstract:Electrophysiological recordings are commonly used to study the Neural Correlates of consciousness in humans. Previous research is inconsistent as to whether awareness can be indexed with visual awareness negativity (VAN) at about 200 ms or if it occurs later. The present study was preregistered with two main aims: First, to provide independent evidence for or against the presence of VAN, and second, to study whether stimulus size may account for the inconsistent findings. Subjects were shown low-contrast Gaussian filtered gratings (Gabor patches) in the four visual quadrants. Gabor size (large and small) was varied in different sessions and calibrated to each subject’s threshold of visual awareness. Event-related potentials were derived from trials in which subjects localized the Gabors correctly to capture the difference between trials in which they reported awareness versus no awareness. Bayesian analyses revealed very strong evidence for the presence of VAN for both Gabor sizes. However, there was no evidence for or against an effect of stimulus size. The present findings provide evidence for VAN as an early Neural Correlate of awareness.
Rick L Jenison - One of the best experts on this subject based on the ideXlab platform.
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Neural Correlate of auditory spatial attention allocation in the superior colliculus
Journal of Neurophysiology, 2018Co-Authors: Abigail Z Rajala, Rick L Jenison, Luis C PopulinAbstract:These results show for the first time a Neural Correlate of attention capture and inhibition of return in response to auditory stimuli in the superior colliculus of the head-unrestrained monkey.
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Neural Correlate of auditory spatial attention allocation in the superior colliculus
Journal of Neurophysiology, 2018Co-Authors: Abigail Z Rajala, Rick L Jenison, Luis C PopulinAbstract:This study is the physiological complement to previous behavioral work that demonstrated that rhesus monkeys are able to allocate attention about the surrounding space based on brief, broadband auditory cues. Single-unit recordings were taken from the intermediate layers of the superior colliculus (iSC) while the subjects oriented to visual and auditory targets in the context of a cuing task with their heads unrestrained. The results show a correlation between behavioral manifestations of attention allocation, attention capture and inhibition of return, and modulation of target-evoked responses in single iSC neurons. NEW & NOTEWORTHY These results show for the first time a Neural Correlate of attention capture and inhibition of return in response to auditory stimuli in the superior colliculus of the head-unrestrained monkey.
