The LightTrack OiS200 In Vivo Imaging system is a modular optical imaging system that can be used to image effects of optogenetic stimulation, mesoscale calcium signalling, Intrinsic Optical Imaging, Fluorescence Imaging and/or Speckle Imaging. These are minimally-invasive techniques for observing brain activity in vivo over a large area of the cortex and at cellular resolutions.
A) Example of a possible setup with visual stimulation during acquisition (left) and contrast images related to four different channels (right). B) Analysis pipeline: after classification of each channels, the fluorescence images are corrected for hemodynamic fluctuations. Then, Normalization and GSR can be applied to get the DF/F signal. Finally, 3 different paradigms are presented: Resting State, Continuous Stimulation, Episodic stimulation. C) Typical results obtained in Resting State: From the DF/F signal, the correlation matrix between each seeds (red dots). D) A periodic stimulation is presented to the mice. Then, on DF/F data, a Fourrier Transform is computed to get the amplitude and phase maps at the stimulation frequency. From these, the visual areas can be mapped on the cortex. E) Different stimulation parameters are used and repeated few times to get a good average on the response. After each set of parameters repetitions are separated, a matrix showing the maximal amplitude of the response is generated.
Movement correction method for laser speckle contrast imaging of cerebral blood flow in cranial windows in rodents. Guilbert, J., & Desjardins, M. (2022).
A Longitudinal Pilot Study on Cognition and Cerebral Hemodynamics in a Mouse Model of Preeclampsia Superimposed on Hypertension: Looking at Mothers and Their Offspring. Trigiani, L. J., Lecrux, C., Royea, J., Lavoie, J. L., Lesage, F., Pilote, L., & Hamel, E. (2021).
Developmental and interventional plasticity of motor maps after perinatal stroke. Zhang, S. Y., Jeffers, M. S., Lagace, D. C., Kirton, A., & Silasi, G. (2021).
Mesoscopic Mapping of Stimulus-Selective Response Plasticity in the Visual Pathways Modulated by the Cholinergic System. Laliberté, G., Othman, R., & Vaucher, E. (2020).
A Pilot Study Investigating Changes in Capillary Hemodynamics and Its Modulation by Exercise in the APP-PS1 Alzheimer Mouse Model. Lu, X., Moeini, M., Li, B., Lu, Y., Damseh, R., Pouliot, P., … & Lesage, F. (2019).
Correlation of hemodynamic and fluorescence signals under resting state conditions in mice’s barrel field cortex. Bélanger, S., Oliveira Ferreira de Souza, B., Casanova, C., & Lesage, F. (2016).