EDUCATION


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Jiang Xiaofeng

Two trials about self –motion perception

Friday, July 1,2016

15:00 pm

Room207,Science building,Huajiachi campus

Abstract

Visual and vestibular cues provide different information about spatial orientation. We will talk about two trials which use MOOG mobile platform. These trails will told us how visual and vestibular cues affect our perception on self-motion.

Selected references

        Kolev O I, Nicoucar K. Flash induced afterimage versus single spot visual object influence on visual–vestibular interaction in detection threshold for self-motion perception[J]. Neuroscience Letters, 2014, 564(2):43-47.

        Mardirossian V, Karmali F, Merfeld D. Thresholds for human perception of roll tilt motion: patterns of variability based on visual, vestibular, and mixed cues.[J]. Otology & neurotology : official publication of the American Otological Society, American Neurotology Society [and] European Academy of Otology and Neurotology, 2014, 35(5):857-60.

       Website link:

        http://www.ncbi.nlm.nih.gov/pubmed/?term=Thresholds+for+human+perception+of+roll+tilt+motion%3A+patterns+of+variability+based+on+visual%2C+vestibular%2C+and+mixed+cues

        http://www.ncbi.nlm.nih.gov/pubmed/?term=Flash+induced+afterimage+versus+single+spot+visual+object+influence+on+visual%E2%80%93vestibular+interaction+in+detection+threshold+for+self-motion+perception


          Gao Yang

Performance evaluation of single loop coils

Friday, July 1,2016

15:00 pm

Room207,Science building,Huajiachi campus

Abstract

Single loop coil is the most simple RF coil, but it is very effective in imaging local surface regions. Theoretically speaking, the receive sensitivity of the single loop coil has a negative correlation with the diameter of the coil. Meanwhile, the transmit coverage and homogeneity has a positive correlation with the diameter of the transmit coil. Therefore, the best choice for single loop coils may be using large diameter loop as transmit coil and smaller diameter loop as receive coil. B1 and SNR are two essential measurements of the performance of the transmit and receive coil. This time,will show you the most recent results about performance evaluation of single loop coils using 7T scanner.

Selected references

       Lattanzi, R., et al., Performance evaluation of a 32-element head array with respect to the ultimate intrinsic SNR. NMR IN BIOMEDICINE, 2010. 23(2): p. 142-151.

       Website link:

       http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2830315/

2016-06-28 READ MORE


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Rui Yunyun

     Evolving Models of Pavlovian Conditioning: CerebellarCortical Dynamics in Awake Behaving Mice

      15:00 pm,Friday, June 24,2016

      Room207,Science building,Huajiachi campus

Abstract

     Purkinje cell simple spike suppression is a central driving mechanism in cerebellarconditioning. Here, ten Brinke et al. show how simple spike suppression, conditioned stimulus-related complex spikes, and molecular layer interneuron (MLI) activity correlate to conditioned eyelid behavior. Moreover, transgenic impairment of MLI input results in deficits in conditioned behavior.

Highlights:

    Simple spike suppression correlates trial by trial to conditioned eyelid behavior;

    Conditioned stimulus-related complex spikes relate to simple spikes and behavior;

    Molecular layer interneuron (MLI) modulation correlates to behavior;

    Transgenic deficits in MLI input result in partially impaired eyeblink conditioning.

Selected references

           Evolving Models of PavlovianConditioning: Cerebellar Cortical Dynamics in Awake Behaving Mice, ten Brinke et al., 2015, Cell Reports 13, 1977–1988.

       Website link

       http://www.sciencedirect.com/science/article/pii/S2211124715012462


Ju Xihui

Strategy-dependent encoding of planned arm movement

Friday, June 24,2016

15:00 pm

Room207,Science building,Huajiachi campus

Abstract

     The kinematic strategy encoded in motor cortical areas for classic straight-line reaching is remarkably simple and consistent across subjects, despite the complicated musculoskeletal dynamics that are involved. As tasks become more challenging, however, different conscious strategies may be used to improve perceived behavioral performance. We identified additional spatial information that appeared both in single neurons and in the population code of monkey dorsal premotor cortex when obstacles impeded direct reach paths. The neural correlate of movement planning varied between subjects in a manner consistent with the use of different strategies to optimize task completion. These distinct planning strategies were manifested in the timing and strength of the information contained in the neural population code.

Selected references

       Pearce, Thomas M., and Daniel W. Moran. "Strategy-dependent encoding of planned arm movements in the dorsal premotor cortex." Science 337.6097 (2012): 984-988.

Website link: http://science.sciencemag.org/content/337/6097/984

2016-06-22 READ MORE


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Zhao Anran

Visual Topography in Primate V2


Friday, April 8,2016

15:00 pm

213 in Kexuelou , Huajiachi campus


Abstract

The second visual cortical area(V2) of the primate is composed of repeating thin, pale, and thick cytochrome oxidase stripes containing primarily color-selective, broad-band oriented, and disparity-selective cells, respectively. We have now examined topography in V2 with respect to these functional subdivisions. Our data suggest that there are multiple, interleaved visual maps in V2, one of each of the color, orientation, and disparity domains. The same region of visual space is re-represented by each stripe within a stripe cycle, resulting in discontinuities or "jumps back" in representation at stripe borders.


Selected references

Anna W. Roe and Daniel Y.Ts'o, "Visual Topography in Primate V2: Multiple Representation across Functional Stripes", The Journal of Neuroscience, May 1995, 15(5):3689-3715             Website link:http://www.ncbi.nlm.nih.gov/pubmed/7751939

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Ju Xihui

Restoring sensorimotor function through intracorticalinterfaces: progress and looming challenges


Friday, April 8,2016

15:00 pm

213 in Kexuelou , Huajiachi campus


Abstract

The loss of a limb or paralysis resulting from spinal cord injury has devastating consequences on quality of life. One approach to restoring lost sensory and motor abilities in amputees and patients with tetraplegia is to supply them with implants that provide a direct interface with the CNS. Such brain–machine interfaces might enable a patient to exert voluntary control over a prosthetic or robotic limb or over the electrically induced contractions of paralysed muscles. A parallel interface could convey sensory information about the consequences of these movements back to the patient.Recent developments in the algorithms that decode motor intention from neuronal activity and in approaches to convey sensory feedback by electrically stimulatingneurons, using biomimetic and adaptation-based approaches, have shown the promise of invasive interfaces with sensorimotor cortices, although substantial challenges remain.

Selected references

Bensmaia S J, Miller L E. Restoring sensorimotor function through intracorticalinterfaces: progress and looming challenges.[J]. Nature Reviews Neuroscience, 2014, 15(5):313-25.

Website link: http://www.nature.com/nrn/journal/v15/n5/full/nrn3724.html


2016-04-07 READ MORE


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Gao Yang

High spatial resolution fMRI using initial dip BOLDsignal

Friday, April 1,2016

15:00 pm

213 in Kexuelou , Huajiachi campus


Abstract

Over the past 20 years much attention has been given to characterizing the spatial accuracy of fMRI based signals and to techniques that improve on its co-localization with neuronal activity. While the vast majority of fMRI studies have always used the conventional positive BOLD signal, the initial dip BOLD fMRI which was motivated by optical imaging studies have demonstrated higher spatial specificity. However, therewere conflicting views about the associated mechanisms and whether it could be generalized across brain regions or species, in addition to whether or not it wouldprove fruitful for neuroscience. Recent discoveries showed new implications of the underlying mechanism of initial dip and its application potential in neuroscience.


Selected references

Hu, X. and E. Yacoub, The story of the initial dip in fMRI. NEUROIMAGE, 2012. 62(2SI): p. 1103-1108.

Watanabe, M., et al., Temporal Jitter of the BOLD Signal Reveals a Reliable Initial Dip and Improved Spatial Resolution. CURRENT BIOLOGY, 2013. 23(21): p. 2146-2150.


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Yunyun Rui

The neuronal representation of  pitch in primate auditory cortex


Friday, April 1,2016

15:00 pm

213 in Kexuelou , Huajiachi campus


Abstract

Pitch perception is critical for identifying and segregating auditory objects, especially in the context of music and speech. The perception of pitch is not unique to humans and has been experimentally demonstrated in several animal species. Spectrally dissimilar sounds can have the same pitch if they share a common f0. Even when the acoustic energy at f0 is removed (‘missing fundamental’) the same pitch is still perceived. Despite its importance for hearing, how pitch is represented in the cerebral cortex is unknown. Here we show the existence of neurons in the auditory cortex of marmoset monkeys that respond to both pure tones and missing fundamental harmonic complex sounds with the same f0, providing a neural correlate for pitch constancy.

Selected references

Daniel Bendor & Xiaoqin Wang. The neuronal representation of  pitch in primate auditory cortex. Nature 436, 1161-1165 (25 August 2005)


2016-03-28 READ MORE
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