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Whole-brain studies of spontaneous behavior in head-fixed rats enabled by zero echo time MB-SWIFT fMRI
[article]
2021
bioRxiv
pre-print
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Third, we show odor-induced activation of olfactory system with high correlation between the fMRI and behavioral responses. ...
Importantly, novel zero echo time and large bandwidth approaches, such as MB-SWIFT, can be applied for human behavioral studies, allowing more freedom as body movement is dramatically less restricting ...
Acknowledgements This work was supported by the National Institutes of Health grants U01-NS103569-01 and P41-EB027061, and Jane & Aatos Erkko Foundation. ...
doi:10.1101/2021.06.15.448321
fatcat:gfwx5vstybbnjeygcbfy6hszh4
Emotional discrimination during viewing unpleasant pictures: timing in human anterior ventrolateral prefrontal cortex and amygdala
2015
Frontiers in Human Neuroscience
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We recorded the temporal dynamics of blood-oxygen-level-dependent (BOLD) signals in those brain regions during the viewing of unpleasant pictures by using functional magnetic resonance imaging (fMRI) with ...
Results show that emotional discrimination in the right amygdala precedes that in the left amygdala and that emotional discrimination in both those regions precedes that in the right anterior VLPFC. ...
Though the blood-oxygenlevel-dependent (BOLD) signal in fMRI is delayed relative to the neural response, the timing of the signal within active regions is highly reliable (Kim et al., 1997; Menon and ...
doi:10.3389/fnhum.2015.00051
pmid:25713527
pmcid:PMC4322640
fatcat:tezc57mdszefbhahsidwqj2mv4
Time Course of Odorant-Induced Activation in the Human Primary Olfactory Cortex
2000
Journal of Neurophysiology
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We show that odorant-induced activation in primary olfactory cortex was not previously made evident with fMRI because of the unique time course of activity in this region: in primary olfactory cortex, ...
Time course of odorant-induced activation in the human primary olfactory cortex. J. Neurophysiol. 83: 537-551, 2000. ...
In other words, the continued response in secondary olfactory cortex may depend on a direct input from the olfactory bulb rather that on input that traverses POC. ...
doi:10.1152/jn.2000.83.1.537
pmid:10634894
fatcat:om5gke26vng2naqo767lia6emq
Olfactory fMRI: Implications of Stimulation Length and Repetition Time
2018
Chemical Senses
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This study aimed to investigate the effects of stimulation length and repetition time (TR) on the activation pattern of 4 olfactory brain regions: the anterior and the posterior piriform cortex, the orbitofrontal ...
GLM analysis showed that the combination of short stimulation and short TR could result in visually larger activation within these olfactory areas. ...
Acknowledgements The authors would like to thank Marcelo Perreira Martins for substantial contribution during data acquisition and Lars Valter from Forum Östergötland for statistical guidance. ...
doi:10.1093/chemse/bjy025
pmid:29726890
fatcat:emjfdjwjfbhu7onnxmqd7nyrda
Estudio objetivo del olfato mediante resonancia magnética funcional
2012
Acta Otorrinolaringológica Española
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Objective: To show the results of a device that generates automated olfactory stimuli suitable for functional magnetic resonance imaging (fMRI) experiments. ...
Results: We observed olfactory activity in the olfactory bulb, entorhinal cortex (4%), amygdala (2.5%) and temporo-parietal cortex, especially in the areas related to emotional integration. ...
The aim of this work is to show the results among normal subjects of an olfactometer capable of generating olfactory tasks in the context of an fMRI study of brain activity. ...
doi:10.1016/j.otorri.2012.01.010
pmid:22487600
fatcat:rf57z35675d25fzoqvxqa2vmyq
Real-time fMRI-based Brain Computer Interface: A Review
[article]
2018
arXiv
pre-print
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Among them, the functional magnetic resonance imaging (fMRI), which has high spatial resolution, acceptable temporal resolution, simple calibration, and short preparation time, has been widely used in ...
Compared with the electroencephalogram (EEG), real-time fMRI-based brain computer interface (rtfMRI-BCI) not only can perform decoding analysis across the whole brain to control external devices, but also ...
Among these signals, fMRI non-invasively measures the task-induced bloodoxygen-level-dependent (BOLD) changes related to brain neuronal activities. ...
arXiv:1808.05852v1
fatcat:loqn5vmpujgsdkfkxbpe6yfewa
Improved Activation and Hemodynamic Response Function of Olfactory fMRI Using Simultaneous Multislice with Reduced TR Acquisition
2021
BioMed Research International
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Results. The 500 ms and 1000 ms TRs both significantly improved the number of activated voxels, mean, and maximum t -score in the amygdalae and insulae, compared with a 3000 ms TR (all P < 0.05 ). ...
The fast image acquisition technique of SMS with reduced TR could significantly improve the functional activation and HRF curve in olfactory fMRI. ...
Acknowledgments The authors thank the Natural Science Foundation of China (No. 31971021) for the financial support. ...
doi:10.1155/2021/9965756
pmid:35005024
pmcid:PMC8731284
fatcat:xrg6mzzzvjavtdq2gwibzuc5oq
Central Olfactory Pathway in Response to Olfactory Stimulation in Rats Detected by Magnetic Resonance Imaging
2005
Chemical Senses
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Results
Experiment I (fMRI) Responses of higher-order olfactory areas to odors were observed by fMRI in rats. ...
Blood oxygenation level-dependent (BOLD) fMRI was performed on a SMIS MRI system consisted of a 4.7 T/400 horizontal superconducting magnet equipped with actively shielded gradient coils (54 mT/m, 26 cm ...
doi:10.1093/chemse/bjh169
pmid:15738098
fatcat:jdpexmbnibfepfwxlgmosvjdom
State-dependent functional connectivity of rat olfactory system assessed by fMRI
2011
Neuroscience Letters
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The present results demonstrate that fMRI-based resting state functional connectivity between the piriform cortex and both limbic and neocortical areas is enhanced during slow-wave state compared to fast-wave ...
Functional connectivity between the piriform cortex and limbic and neocortical areas was assessed using functional magnetic resonance imaging (fMRI) of urethane anesthetized rats that spontaneously cycled ...
Acknowledgments This work was supported by grant DC003906 from NIDCD to D.A.W., R21 MH086952-02 from NIMH awarded to Francisco X. Castellanos, and 1S10RR023534-01 from NCRR awarded to C. Branch. ...
doi:10.1016/j.neulet.2011.04.031
pmid:21530613
pmcid:PMC3103633
fatcat:swf5wcmiyrdbtadz5mbat6djge
Time course of odorant- and trigeminal-induced activation in the human brain: an event-related functional magnetic resonance imaging study
2011
Neuroscience
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This functional magnetic resonance imaging (fMRI) study compares brain activations resulting from the contrast between two odorant conditions (one bimodal odor and one relatively pure olfactory stimulant ...
Different regions of the frontal, temporal and occipital lobe are activated depending on the duration but mainly during medium-duration stimulations. ...
As the aim of our study was the time course of activation in response to the trigeminal component of an odorant, we focused the analysis only on the significant activations resulting from the bimodal stimulations ...
doi:10.1016/j.neuroscience.2011.05.035
pmid:21620934
fatcat:cuy2vun6y5fohbthm3r4ktprxy
CA3 NMDA receptors are required for experience-dependent shifts in hippocampal activity
2007
Hippocampus
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The anatomical distribution of sensory-evoked activity recorded from the hippocampal long-axis can shift depending on prior experience. ...
First, we were required to develop an fMRI protocol that can record sensory-evoked activity from the mouse hippocampal long-axis. ...
Acknowledgment Mark Albers is thanked for his aid in developing the olfactory stimulation task. ...
doi:10.1002/hipo.20332
pmid:17607765
fatcat:5o625azebjfjvn27hlhmzwdso4
Olfactory fMRI in Patients with Parkinson's Disease
2010
Frontiers in Integrative Neuroscience
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Patients tended to rate the stimuli presented during fMRI scans as less intense, but also as more pleasant than controls. fMRI results revealed differences between PD patients and controls which depended ...
Olfactory stimuli were applied during fMRI scanning to show disease-related modulation of central nervous system structures and to advance our understanding of olfactory dysfunction in PD patients. ...
on olfactory activation (Table 1 ). ...
doi:10.3389/fnint.2010.00125
pmid:21120143
pmcid:PMC2991239
fatcat:zkz4cpexdvhofkgbgrdnn3hyvi
Functional Magnetic Resonance Imaging in the Olfactory Perception of the Same Stimuli
2020
Life
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The aim of this paper was to evaluate brain maps generated from functional Magnetic Resonance Imaging (fMRI) data, collected from healthy individuals in response to the same olfactory stimulus. ...
Results. The fMRI brain maps showed that odorous stimuli activate primarily the left anterior insula (in 35/45 cases or 77.8%). ...
Data from the majority of the fMRI studies report that after a period of 10-15 s poststimulus, an activation of the primary olfactory cortex is visible, after which the Blood Oxygenation Level Dependent ...
doi:10.3390/life11010011
pmid:33375540
fatcat:szcicgfbr5cjniwwcvn4gn4uhi
Appetitive and Aversive Olfactory Learning in Humans Studied Using Event-Related Functional Magnetic Resonance Imaging
2002
Journal of Neuroscience
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We combined event-related functional magnetic resonance imaging (fMRI) with olfactory classical conditioning to differentiate the neural responses evoked during appetitive and aversive olfactory learning ...
Learning-related neural activity, comparing unpaired (face only) CSϩ stimuli with CSϪ, showed valence-independent activations in rostral and caudal orbitofrontal cortex (OFC). ...
. • fMRI of Appetitive and Aversive Olfactory Learning ...
doi:10.1523/jneurosci.22-24-10829.2002
pmid:12486176
fatcat:n5we64gy4bbfte7iudnmkywv44
Reading cinnamon activates olfactory brain regions
2006
NeuroImage
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Acknowledgments This study was partly supported by the Ministry of Science and Technology of Spain (I+D+I, Project BSO2003-01002/PSCE, University Jaume I, Castelló n de la Plana, Spain). ...
Colour words were elicited by achromatic line drawings of objects in one experiment and by the written names of objects in a second experiment, which meant that the subjects were at no time submitted to ...
Neurophysiological experiments will be necessary to reveal the time course of brain activation in odour word processing and to decide whether specific olfactory areas are activated automatically and immediately ...
doi:10.1016/j.neuroimage.2006.03.037
pmid:16651007
fatcat:h2724ctxordidhcztjogaow6te
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