A. Volterra and J. Meldolesi, Astrocytes, from brain glue to communication elements: the revolution continues, Nature Reviews Neuroscience, vol.21, issue.8, pp.626-640, 2005.
DOI : 10.1038/35077000

A. Araque, V. Parpura, R. Sanzgiri, and P. Haydon, Tripartite synapses: glia, the unacknowledged partner, Trends in Neurosciences, vol.22, issue.5, pp.208-215, 1999.
DOI : 10.1016/S0166-2236(98)01349-6

A. Cornell-bell, S. Finkbeiner, M. Cooper, and S. Smith, Glutamate induces calcium waves in cultured astrocytes: long-range glial signaling, Science, vol.247, issue.4941, pp.470-473, 1990.
DOI : 10.1126/science.1967852

P. Haydon, GLIA: listening and talking to the synapse, Nature Reviews Neuroscience, vol.2, issue.3, pp.185-193, 2001.
DOI : 10.1038/35058528

J. Porter and K. Mccarthy, Hippocampal Astrocytes In Situ Respond to Glutamate Released from Synaptic Terminals, J Neurosci, vol.16, pp.5073-5081, 1996.

A. Araque, E. Martin, G. Perea, J. Arellano, and W. Buno, Synaptically Released Acetylcholine Evokes Ca2+ Elevations in Astrocytes in Hippocampal Slices, J Neurosci, vol.22, pp.2443-2450, 2002.

J. Dani, A. Chernjavsky, and S. Smith, Neuronal activity triggers calcium waves in hippocampal astrocyte networks, Neuron, vol.8, issue.3, pp.429-440, 1992.
DOI : 10.1016/0896-6273(92)90271-E

T. Murphy, L. Blatter, W. Wier, and J. Baraban, Rapid communication between neurons and astrocytes in primary cortical cultures, J Neurosci, vol.13, pp.2672-2679, 1993.

E. Bushong, M. Martone, Y. Jones, and M. Ellisman, Protoplasmic Astrocytes in CA1 Stratum Radiatum Occupy Separate Anatomical Domains, J Neurosci, vol.22, pp.183-192, 2002.

A. Araque, Astrocytes process synaptic information, Neuron Glia Biology, vol.20, issue.01, pp.3-10, 2008.
DOI : 10.1002/glia.440110210

M. Navarrete and A. Araque, Endocannabinoids Mediate Neuron-Astrocyte Communication, Neuron, vol.57, issue.6, pp.883-893, 2008.
DOI : 10.1016/j.neuron.2008.01.029

G. Perea and A. Araque, Glial calcium signaling and neuron???glia communication, Cell Calcium, vol.38, issue.3-4, pp.375-382, 2005.
DOI : 10.1016/j.ceca.2005.06.015

D. Pittà, M. Volman, V. Berry, H. Parpura, V. Volterra et al., Computational quest for understanding the role of astrocyte signaling in synaptic transmission and plasticity, Front Comput Neurosci, vol.6, 2012.

C. Agulhon, T. Fiacco, and K. Mccarthy, Hippocampal Short- and Long-Term Plasticity Are Not Modulated by Astrocyte Ca2+ Signaling, Science, vol.327, issue.5970, pp.1250-1254, 2010.
DOI : 10.1126/science.1184821

T. Basarsky, V. Parpura, and P. Haydon, Hippocampal synaptogenesis in cell culture: developmental time course of synapse formation, calcium influx, and synaptic protein distribution, J Neurosci, vol.14, pp.6402-6411, 1994.

M. Nedergaard, Direct signaling from astrocytes to neurons in cultures of mammalian brain cells, Science, vol.263, issue.5154, pp.1768-1771, 1994.
DOI : 10.1126/science.8134839

I. Latour, C. Gee, R. Robitaille, and J. Lacaille, Differential mechanisms of Ca2+ responses in glial cells evoked by exogenous and endogenous glutamate in rat hippocampus, Hippocampus, vol.47, issue.2, pp.132-145, 2001.
DOI : 10.1002/hipo.1031

A. Panatier, J. Vallée, M. Haber, K. Murai, and J. Lacaille, Astrocytes Are Endogenous Regulators of Basal Transmission at Central Synapses, Cell, vol.146, issue.5, pp.785-798, 2011.
DOI : 10.1016/j.cell.2011.07.022

G. Perea, M. Navarrete, and A. Araque, Tripartite synapses: astrocytes process and control synaptic information, Trends in Neurosciences, vol.32, issue.8, pp.421-431, 2009.
DOI : 10.1016/j.tins.2009.05.001

N. Herzog, M. Shein-idelson, and Y. Hanein, extra-cellular neuronal recordings, Journal of Neural Engineering, vol.8, issue.5, p.56008, 2011.
DOI : 10.1088/1741-2560/8/5/056008

I. Breskin, J. Soriano, E. Moses, and T. Tlusty, Percolation in Living Neural Networks, Physical Review Letters, vol.97, issue.18, 2006.
DOI : 10.1103/PhysRevLett.97.188102

Y. Bernardinelli, C. Salmon, E. Jones, W. Farmer, and D. Stellwagen, Astrocytes Display Complex and Localized Calcium Responses to Single-Neuron Stimulation in the Hippocampus, Journal of Neuroscience, vol.31, issue.24, pp.8905-8919, 2011.
DOI : 10.1523/JNEUROSCI.6341-10.2011

E. Maeda, H. Robinson, and A. Kawana, The mechanisms of generation and propagation of synchronized bursting in developing networks of cortical neurons, J Neurosci, vol.15, pp.6834-6845, 1995.

D. Eytan and S. Marom, Dynamics and Effective Topology Underlying Synchronization in Networks of Cortical Neurons, Journal of Neuroscience, vol.26, issue.33, pp.8465-8476, 2006.
DOI : 10.1523/JNEUROSCI.1627-06.2006

M. Shein, V. Volman, N. Raichman, Y. Hanein, and E. Ben-jacob, Management of synchronized network activity by highly active neurons, Physical Biology, vol.5, issue.3, p.36008, 2008.
DOI : 10.1088/1478-3975/5/3/036008

P. Gorry, General least-squares smoothing and differentiation by the convolution (Savitzky-Golay) method, Analytical Chemistry, vol.62, issue.6, pp.570-573, 1990.
DOI : 10.1021/ac00205a007

A. Savitzky and M. Golay, Smoothing and Differentiation of Data by Simplified Least Squares Procedures., Analytical Chemistry, vol.36, issue.8, pp.1627-1639, 1964.
DOI : 10.1021/ac60214a047

Y. Ikegaya, L. Bon-jego, M. Yuste, and R. , Large-scale imaging of cortical network activity with calcium indicators, Neuroscience Research, vol.52, issue.2, pp.132-138, 2005.
DOI : 10.1016/j.neures.2005.02.004

A. Grossmann and J. Morlet, Decomposition of Hardy Functions into Square Integrable Wavelets of Constant Shape, SIAM Journal on Mathematical Analysis, vol.15, issue.4, pp.723-736, 1984.
DOI : 10.1137/0515056

K. Supekar, V. Menon, D. Rubin, M. Musen, and M. Greicius, Network Analysis of Intrinsic Functional Brain Connectivity in Alzheimer's Disease, PLoS Computational Biology, vol.17, issue.6, 2008.
DOI : 10.1371/journal.pcbi.1000100.s001

C. Tallon-baudry, O. Bertrand, C. Delpuech, and J. Pernier, Oscillatory gamma -Band (30?70 Hz) Activity Induced by a Visual Search Task in Humans, J Neurosci, vol.17, pp.722-734, 1997.

D. Percival and A. Walden, Wavelet Methods for Time Series Analysis, 2006.

D. Gabor, Theory of communication. Part 1: The analysis of information, Journal of the Institution of Electrical Engineers - Part III: Radio and Communication Engineering, vol.93, issue.26, pp.429-441, 1946.
DOI : 10.1049/ji-3-2.1946.0074

D. Pittà, M. Goldberg, M. Volman, V. Berry, H. Ben-jacob et al., Glutamate regulation of calcium and IP3 oscillating and pulsating dynamics in astrocytes, Journal of Biological Physics, vol.85, issue.9, pp.383-411, 2009.
DOI : 10.1007/s10867-009-9155-y

M. Goldberg, M. Pittà, V. Volman, H. Berry, and E. Ben-jacob, Nonlinear Gap Junctions Enable Long-Distance Propagation of Pulsating Calcium Waves in Astrocyte Networks, PLoS Computational Biology, vol.7, issue.1, 2010.
DOI : 10.1371/journal.pcbi.1000909.s009

URL : https://hal.archives-ouvertes.fr/inria-00575656

J. Nagy and J. Rash, Connexins and gap junctions of astrocytes and oligodendrocytes in the CNS, Brain Research Reviews, vol.32, issue.1, pp.29-44, 2000.
DOI : 10.1016/S0165-0173(99)00066-1

J. Lallouette, D. Pittà, M. Ben-jacob, E. Berry, and H. , Sparse short-distance connections enhance calcium wave propagation in a 3D model of astrocyte networks, Frontiers in Computational Neuroscience, vol.4, issue.8, 2014.
DOI : 10.1042/AN20110061

URL : https://hal.archives-ouvertes.fr/hal-00967106

M. Tsodyks and H. Markram, The neural code between neocortical pyramidal neurons depends on neurotransmitter release probability, Proceedings of the National Academy of Sciences, vol.94, issue.2, pp.719-723, 1997.
DOI : 10.1073/pnas.94.2.719

G. Fuhrmann, I. Segev, H. Markram, and M. Tsodyks, Coding of temporal information by activity-dependent synapses, J Neurophysiol, vol.87, pp.140-148, 2002.

S. Matsutani and N. Yamamoto, Neuronal regulation of astrocyte morphology in vitro is mediated by GABAergic signaling, Glia, vol.22, issue.1, pp.1-9, 1997.
DOI : 10.1002/(SICI)1098-1136(199705)20:1<1::AID-GLIA1>3.0.CO;2-E

H. Parri, T. Gould, and V. Crunelli, Spontaneous astrocytic Ca2+ oscillations in situ drive NMDAR-mediated neuronal excitation, Nature Neuroscience, vol.4, issue.8, pp.803-812, 2001.
DOI : 10.1038/90507

A. Fatatis and J. Russell, Spontaneous changes in intracellular calcium concentration in type I astrocytes from rat cerebral cortex in primary culture, Glia, vol.318, issue.2, pp.95-104, 1992.
DOI : 10.1002/glia.440050203

P. Latham, B. Richmond, S. Nirenberg, and P. Nelson, Intrinsic Dynamics in Neuronal Networks. II. Experiment, J Neurophysiol, vol.83, pp.828-835, 2000.

F. Rattay, The basic mechanism for the electrical stimulation of the nervous system, Neuroscience, vol.89, issue.2, pp.335-346, 1999.
DOI : 10.1016/S0306-4522(98)00330-3

A. Tolias, F. Sultan, M. Augath, A. Oeltermann, and E. Tehovnik, Mapping Cortical Activity Elicited with Electrical Microstimulation Using fMRI in the Macaque, Neuron, vol.48, issue.6, pp.901-911, 2005.
DOI : 10.1016/j.neuron.2005.11.034

H. Gurden, N. Uchida, and Z. Mainen, Sensory-Evoked Intrinsic Optical Signals in the Olfactory Bulb Are Coupled to Glutamate Release and Uptake, Neuron, vol.52, issue.2, pp.335-345, 2006.
DOI : 10.1016/j.neuron.2006.07.022

L. Pasti, A. Volterra, T. Pozzan, and G. Carmignoto, Intracellular Calcium Oscillations in Astrocytes: A Highly Plastic, Bidirectional Form of Communication between Neurons and Astrocytes In Situ, J Neurosci, vol.17, pp.7817-7830, 1997.

G. Perea and A. Araque, Properties of Synaptically Evoked Astrocyte Calcium Signal Reveal Synaptic Information Processing by Astrocytes, Journal of Neuroscience, vol.25, issue.9, pp.2192-2203, 2005.
DOI : 10.1523/JNEUROSCI.3965-04.2005

J. Schummers, H. Yu, and M. Sur, Tuned Responses of Astrocytes and Their Influence on Hemodynamic Signals in the Visual Cortex, Science, vol.320, issue.5883, pp.1638-1643, 2008.
DOI : 10.1126/science.1156120

X. Wang, N. Lou, Q. Xu, G. Tian, and W. Peng, Astrocytic Ca2+ signaling evoked by sensory stimulation in vivo, Nature Neuroscience, vol.24, issue.6, pp.816-823, 1703.
DOI : 10.1038/nn1703

A. Nimmerjahn, F. Kirchhoff, J. Kerr, and F. Helmchen, Sulforhodamine 101 as a specific marker of astroglia in the neocortex in vivo, Nature Methods, vol.263, issue.1, pp.31-37, 2004.
DOI : 10.1038/nmeth706

A. Nimmerjahn, Astrocytes going live: advances and challenges, The Journal of Physiology, vol.6, issue.8, pp.1639-1647, 2009.
DOI : 10.1113/jphysiol.2008.167171

M. Pittà, M. Goldberg, V. Volman, H. Berry, and E. Ben-jacob, Glutamate regulation of calcium and IP3 oscillating and pulsating dynamics in astrocytes, Journal of Biological Physics, vol.85, issue.9, pp.383-411, 2009.
DOI : 10.1007/s10867-009-9155-y

C. Agulhon, J. Petravicz, A. Mcmullen, E. Sweger, and S. Minton, What Is the Role of Astrocyte Calcium in??Neurophysiology?, Neuron, vol.59, issue.6, pp.932-946, 2008.
DOI : 10.1016/j.neuron.2008.09.004

G. Petzold, D. Albeanu, T. Sato, and V. Murthy, Coupling of Neural Activity to Blood Flow in Olfactory Glomeruli Is Mediated by Astrocytic Pathways, Neuron, vol.58, issue.6, pp.897-910, 2008.
DOI : 10.1016/j.neuron.2008.04.029

A. Nimmerjahn, E. Mukamel, and M. Schnitzer, Motor Behavior Activates Bergmann Glial Networks, Neuron, vol.62, issue.3, pp.400-412, 2009.
DOI : 10.1016/j.neuron.2009.03.019

A. Ghosh, M. Wyss, and B. Weber, Somatotopic astrocytic activity in the somatosensory cortex, Glia, vol.6, issue.Pt 3, pp.601-610, 2013.
DOI : 10.1002/glia.22458

T. Fellin and G. Carmignoto, Neurone-to-astrocyte signalling in the brain represents a distinct multifunctional unit, The Journal of Physiology, vol.553, issue.1, pp.3-15, 2004.
DOI : 10.1113/jphysiol.2004.063214

A. Verkhratsky and A. Butt, Glial physiology and pathophysiology, 2013.
DOI : 10.1002/9781118402061

M. Sofroniew, Molecular dissection of reactive astrogliosis and glial scar formation, Trends in Neurosciences, vol.32, issue.12, pp.638-647, 2009.
DOI : 10.1016/j.tins.2009.08.002

J. Zamanian, L. Xu, L. Foo, N. Nouri, and L. Zhou, Genomic Analysis of Reactive Astrogliosis, Journal of Neuroscience, vol.32, issue.18, pp.6391-6410, 2012.
DOI : 10.1523/JNEUROSCI.6221-11.2012

M. Pekny, U. Wilhelmsson, and M. Pekna, The dual role of astrocyte activation and reactive gliosis, Neuroscience Letters, vol.565, pp.30-38, 2014.
DOI : 10.1016/j.neulet.2013.12.071

K. Mccarthy, D. Vellis, and J. , Preparation of separate astroglial and oligodendroglial cell cultures from rat cerebral tissue, The Journal of Cell Biology, vol.85, issue.3, pp.890-902, 1980.
DOI : 10.1083/jcb.85.3.890

A. Koulakoff, P. Ezan, and C. Giaume, Neurons control the expression of connexin 30 and connexin 43 in mouse cortical astrocytes, Glia, vol.66, issue.(Part 2), pp.1299-1311, 2008.
DOI : 10.1002/glia.20698

K. Kuchibhotla, C. Lattarulo, B. Hyman, and B. Bacskai, Synchronous Hyperactivity and Intercellular Calcium Waves in Astrocytes in Alzheimer Mice, Science, vol.323, issue.5918, pp.1211-1215, 2009.
DOI : 10.1126/science.1169096

D. Sieger, C. Moritz, T. Ziegenhals, S. Prykhozhij, and P. F. , Long-Range Ca2+ Waves Transmit Brain-Damage Signals to Microglia, Developmental Cell, vol.22, issue.6, pp.1138-1148, 2012.
DOI : 10.1016/j.devcel.2012.04.012

D. Bock, M. Decrock, E. Wang, N. Bol, M. Vinken et al., The dual face of connexin-based astroglial Ca2+ communication: A key player in brain physiology and a prime target in pathology, Biochimica et Biophysica Acta (BBA) - Molecular Cell Research, vol.1843, issue.10, pp.2211-2232, 2014.
DOI : 10.1016/j.bbamcr.2014.04.016

M. Castro, J. Chuquet, N. Liaudet, K. Bhaukaurally, and M. Santello, Local Ca2+ detection and modulation of synaptic release by astrocytes, Nature Neuroscience, vol.76, issue.10, pp.1276-1284, 2011.
DOI : 10.1002/1098-1136(20010101)33:1<72::AID-GLIA1007>3.3.CO;2-1

A. Volterra, N. Liaudet, and I. Savtchouk, Astrocyte Ca2+ signalling: an unexpected complexity, Nature Reviews Neuroscience, vol.57, issue.5, pp.327-335, 2014.
DOI : 10.1038/nrn3725

C. Giaume, C. Fromaget, A. Aoumari, . El, J. Cordier et al., Gap junctions in cultured astrocytes: Single-channel currents and characterization of channel-forming protein, Neuron, vol.6, issue.1, pp.133-143, 1991.
DOI : 10.1016/0896-6273(91)90128-M

N. Rouach, E. Avignone, W. Même, A. Koulakoff, and L. Venance, Gap junctions and connexin expression in the normal and pathological central nervous system, Biology of the Cell, vol.94, issue.7-8, pp.457-475, 2002.
DOI : 10.1016/S0248-4900(02)00016-3

C. Cina, J. Bechberger, M. Ozog, and C. Naus, Expression of connexins in embryonic mouse neocortical development, The Journal of Comparative Neurology, vol.257, issue.3, pp.298-313, 2007.
DOI : 10.1002/cne.21426

N. Aberg, L. Rönnbä-ck, and P. Eriksson, Connexin43 mRNA and protein expression during postnatal development of defined brain regions, Developmental Brain Research, vol.115, issue.1, pp.97-101, 1999.
DOI : 10.1016/S0165-3806(99)00052-8

V. Houades, A. Koulakoff, P. Ezan, I. Seif, and C. Giaume, Gap Junction-Mediated Astrocytic Networks in the Mouse Barrel Cortex, Journal of Neuroscience, vol.28, issue.20, pp.5207-5217, 2008.
DOI : 10.1523/JNEUROSCI.5100-07.2008

V. Houades, N. Rouach, P. Ezan, F. Kirchhoff, and A. Koulakoff, Shapes of astrocyte networks in the juvenile brain, Neuron Glia Biology, vol.2, issue.01, pp.3-14, 2006.
DOI : 10.1017/S1740925X06000081

L. Rela, A. Bordey, and C. Greer, Olfactory ensheathing cell membrane properties are shaped by connectivity, Glia, vol.24, issue.Pt 3, pp.665-678, 2010.
DOI : 10.1002/glia.20953

N. Rouach, J. Glowinski, and C. Giaume, Activity-Dependent Neuronal Control of Gap-Junctional Communication in Astrocytes, The Journal of Cell Biology, vol.78, issue.7, pp.1513-1526, 2000.
DOI : 10.1046/j.1460-9568.1999.00697.x

F. Blomstrand, C. Giaume, E. Hansson, and L. Rönnbä-ck, Distinct pharmacological properties of ET-1 and ET-3 on astroglial gap junctions and Ca 2+$ signaling, Am J Physiol, vol.277, pp.616-627, 1999.

P. Sáez, J. Orellana, N. Vega-riveros, V. Figueroa, and D. Hernández, Disruption in Connexin-Based Communication Is Associated with Intracellular Ca2+ Signal Alterations in Astrocytes from Niemann-Pick Type C Mice, PLoS ONE, vol.19, issue.8, p.71361, 2013.
DOI : 10.1371/journal.pone.0071361.s003

L. Pasti, T. Pozzan, and G. Carmignoto, Long-lasting Changes of Calcium Oscillations in Astrocytes: A NEW FORM OF GLUTAMATE-MEDIATED PLASTICITY, Journal of Biological Chemistry, vol.270, issue.25, pp.15203-15210, 1995.
DOI : 10.1074/jbc.270.25.15203

K. Ball, L. Harik, G. Gandhi, N. Cruz, and G. Dienel, Reduced gap junctional communication among astrocytes in experimental diabetes: Contributions of altered connexin protein levels and oxidative-nitrosative modifications, Journal of Neuroscience Research, vol.50, issue.Suppl 1, pp.2052-2067, 2011.
DOI : 10.1002/jnr.22663

J. Bolañ-os and J. Medina, Induction of Nitric Oxide Synthase Inhibits Gap Junction Permeability in Cultured Rat Astrocytes, Journal of Neurochemistry, vol.66, issue.5, pp.2091-2099, 1996.
DOI : 10.1046/j.1471-4159.1996.66052091.x