M Ptito

Summary

Country: Canada

Publications

  1. ncbi request reprint Stereological evaluation of neurons and glia in the monkey dorsal lateral geniculate nucleus following an early cerebral hemispherectomy
    Denis Boire
    School of Optometry, University of Montreal, CP 6128, Montreal, PQ, Canada, H3C 3J7
    Exp Brain Res 142:208-20. 2002
  2. ncbi request reprint Cross-modal plasticity in early blindness
    Maurice Ptito
    Ecole d Optometrie, Universite de Montreal, CP 6128, Succursale Centre Ville, Canada
    J Integr Neurosci 4:479-88. 2005
  3. doi request reprint Alterations of the visual pathways in congenital blindness
    Maurice Ptito
    Chaire de recherche Harland Sanders en sciences de vision, Ecole d Optometrie, Universite de Montreal, Montreal, Canada
    Exp Brain Res 187:41-9. 2008
  4. ncbi request reprint TMS of the occipital cortex induces tactile sensations in the fingers of blind Braille readers
    M Ptito
    Chaire Harland Sanders en sciences de la vision, Ecole d Optometrie, Universite de Montreal, Montreal, Canada
    Exp Brain Res 184:193-200. 2008
  5. ncbi request reprint Cross-modal plasticity revealed by electrotactile stimulation of the tongue in the congenitally blind
    Maurice Ptito
    PET Centre and CFIN, Aarhus University Hospitals, Aarhus, Denmark
    Brain 128:606-14. 2005
  6. ncbi request reprint Separate neural pathways for contour and biological-motion cues in motion-defined animal shapes
    Maurice Ptito
    The PET Center, Aarhus University, 8000C, Aarhus, Denmark
    Neuroimage 19:246-52. 2003
  7. ncbi request reprint Tactile-'visual' acuity of the tongue in early blind individuals
    Daniel Robert Chebat
    Chaire de Recherche Harland Sanders, Ecole d Optometrie, Universite de Montreal, Quebec, Canada
    Neuroreport 18:1901-4. 2007
  8. ncbi request reprint Complex motion selectivity in PMLS cortex following early lesions of primary visual cortex in the cat
    B G Ouellette
    Ecole d Optometrie, Universite de Montreal, Montreal, Quebec, Canada
    Vis Neurosci 24:53-64. 2007
  9. doi request reprint Expression and localization of the cannabinoid receptor type 1 and the enzyme fatty acid amide hydrolase in the retina of vervet monkeys
    J Bouskila
    School of Optometry, University of Montreal, Montreal, QC, Canada
    Neuroscience 202:117-30. 2012
  10. ncbi request reprint Neural bases of residual vision in hemicorticectomized monkeys
    M Ptito
    Departement de Psychologie, Universite de Montreal, Canada
    Prog Brain Res 112:385-404. 1996

Collaborators

Detail Information

Publications37

  1. ncbi request reprint Stereological evaluation of neurons and glia in the monkey dorsal lateral geniculate nucleus following an early cerebral hemispherectomy
    Denis Boire
    School of Optometry, University of Montreal, CP 6128, Montreal, PQ, Canada, H3C 3J7
    Exp Brain Res 142:208-20. 2002
    ..The remaining neurons in the dLGN following hemispherectomy appear to be insufficient in number to be importantly implicated in the residual visual functions that have been reported in some hemispherectomized patients...
  2. ncbi request reprint Cross-modal plasticity in early blindness
    Maurice Ptito
    Ecole d Optometrie, Universite de Montreal, CP 6128, Succursale Centre Ville, Canada
    J Integr Neurosci 4:479-88. 2005
    ..We propose that in blind subjects, there is an unmasking of existing cortico-cortical (parieto-occipital) connections, enabling transfer of somatosensory information to visual cortex...
  3. doi request reprint Alterations of the visual pathways in congenital blindness
    Maurice Ptito
    Chaire de recherche Harland Sanders en sciences de vision, Ecole d Optometrie, Universite de Montreal, Montreal, Canada
    Exp Brain Res 187:41-9. 2008
    ....
  4. ncbi request reprint TMS of the occipital cortex induces tactile sensations in the fingers of blind Braille readers
    M Ptito
    Chaire Harland Sanders en sciences de la vision, Ecole d Optometrie, Universite de Montreal, Montreal, Canada
    Exp Brain Res 184:193-200. 2008
    ..These results also add new evidence that the activity of the occipital lobe in the blind takes its qualitative expression from the character of its new input source, therefore supporting the cortical deference hypothesis...
  5. ncbi request reprint Cross-modal plasticity revealed by electrotactile stimulation of the tongue in the congenitally blind
    Maurice Ptito
    PET Centre and CFIN, Aarhus University Hospitals, Aarhus, Denmark
    Brain 128:606-14. 2005
    ..Our data further show that the tongue can act as a portal to convey somatosensory information to visual cortex...
  6. ncbi request reprint Separate neural pathways for contour and biological-motion cues in motion-defined animal shapes
    Maurice Ptito
    The PET Center, Aarhus University, 8000C, Aarhus, Denmark
    Neuroimage 19:246-52. 2003
    ..They further support psychophysical results showing that contour and BM cues for motion-defined animal shapes are processed by independent channels...
  7. ncbi request reprint Tactile-'visual' acuity of the tongue in early blind individuals
    Daniel Robert Chebat
    Chaire de Recherche Harland Sanders, Ecole d Optometrie, Universite de Montreal, Quebec, Canada
    Neuroreport 18:1901-4. 2007
    ..Moreover, our data demonstrate that a subgroup of early blind participants is more efficient than controls in conveying visual information through the tongue...
  8. ncbi request reprint Complex motion selectivity in PMLS cortex following early lesions of primary visual cortex in the cat
    B G Ouellette
    Ecole d Optometrie, Universite de Montreal, Montreal, Quebec, Canada
    Vis Neurosci 24:53-64. 2007
    ..The complex RDK motion selectivity is consistent with both geniculo-cortical and extra-geniculate thalamo-cortical pathways in residual direction encoding...
  9. doi request reprint Expression and localization of the cannabinoid receptor type 1 and the enzyme fatty acid amide hydrolase in the retina of vervet monkeys
    J Bouskila
    School of Optometry, University of Montreal, Montreal, QC, Canada
    Neuroscience 202:117-30. 2012
    ..Neither CB1R nor FAAH are found in the retinal glia, the Müller cells. These data indicate that the eCB system is present throughout the primate retina and is ideally positioned to modulate central and peripheral retinal functions...
  10. ncbi request reprint Neural bases of residual vision in hemicorticectomized monkeys
    M Ptito
    Departement de Psychologie, Universite de Montreal, Canada
    Prog Brain Res 112:385-404. 1996
    ..We argue that the preservation of the retino-tectal pathway mediates most of the residual visual functions found in the 'blind field' of hemispherectomized human subjects...
  11. ncbi request reprint Stereoscopic processing in the human brain as a function of binocular luminance rivalry
    A Fortin
    Ecole d Optometrie, Universite de Montreal, CP 6128, Succursale Centre Ville, Montreal QC H3C 3J7, Canada
    Neuroreport 14:1163-6. 2003
    ..The neural sites that responded to this novel stereoscopic stimulus are similar to those activated by traditional stereograms containing horizontal disparities...
  12. ncbi request reprint Anatomical sparing in the superior colliculus of hemispherectomized monkeys
    H Theoret
    Groupe de Recherche en Neuropsychologie Experimentale, Universite de Montreal, CP 6128, PQ, H3C 3J7, Montreal, Canada
    Brain Res 894:274-80. 2001
    ..These data suggest that the superior colliculus retains functional capabilities following hemispherectomy in monkey...
  13. pmc Distribution, morphology, and synaptic targets of corticothalamic terminals in the cat lateral posterior-pulvinar complex that originate from the posteromedial lateral suprasylvian cortex
    F Huppe-Gourgues
    Laboratoire des Neurosciences de la Vision, Ecole d Optometrie, Universite de Montreal, Montreal, Quebec, Canada H3C 3J7
    J Comp Neurol 497:847-63. 2006
    ....
  14. ncbi request reprint Cortical areas mediating stereopsis in the human brain: a PET study
    Audrey Fortin
    Ecole d Optometrie, Universite de Montreal, CP 6128, Succursale Centre Ville, Montreal Quebec Canada H3C 3J7
    Neuroreport 13:895-8. 2002
    ....
  15. ncbi request reprint Pattern-motion selectivity in the human pulvinar
    Martin Y Villeneuve
    Laboratoire des Neurosciences de la Vision, Ecole d Optometrie, Universite de Montreal, CP 6128 Succ Centre Ville, Montreal, Quebec, Canada H3C 3J7
    Neuroimage 28:474-80. 2005
    ....
  16. doi request reprint Complex motion sensitivity of neurons, in the visual part of the anterior ectosylvian cortex in cats
    N Zabouri
    Laboratoire des Neurosciences de la Vision, Ecole d Optometrie, Universite de Montreal, C P 6128 Succ Centre Ville, Montreal, Quebec, Canada H3C 3J7
    Neuroscience 152:106-18. 2008
    ..Our data suggest that the AEV may be more involved in the analysis of motion of visual patterns in relation to the animal's behavior rather than the analysis of the constituents of the patterns...
  17. ncbi request reprint Global motion integration in the postero-medial part of the lateral suprasylvian cortex in the cat
    M Y Villeneuve
    Laboratoire des Neurosciences de la Vision, Ecole d Optometrie, Universite de Montreal, CP 6128, Succ Centre Ville, Montreal, QC, Canada, H3C 3J7
    Exp Brain Res 172:485-97. 2006
    ..Providing that these same neurons can signal the direction of complex RDKs, there may be distinct cortical mechanisms for processing different types of complex motion...
  18. ncbi request reprint Residual vision in the blind field of hemidecorticated humans predicted by a diffusion scatter model and selective spectral absorption of the human eye
    J Faubert
    Ecole d Optometrie, Universite de Montreal, Quebec, Canada
    Vision Res 39:149-57. 1999
    ....
  19. doi request reprint Beyond visual, aural and haptic movement perception: hMT+ is activated by electrotactile motion stimulation of the tongue in sighted and in congenitally blind individuals
    Isabelle Matteau
    Ecole d Optometrie, Universite de Montreal, Montreal, QC, Canada H3C 3J7
    Brain Res Bull 82:264-70. 2010
    ..In line with previous studies, the differential activations between sighted and congenitally blind individuals indicate that lack of vision leads to functional rearrangements of these supramodal cortical areas...
  20. doi request reprint Reduced soma size of the M-neurons in the lateral geniculate nucleus following foetal alcohol exposure in non-human primates
    M F Papia
    Ecole d Optometrie, Universite de Montreal, Montreal, Canada
    Exp Brain Res 205:263-71. 2010
    ..These results suggest that alterations at the level of morphology and anatomy of the M-neurons may lead to behavioural deficits associated with the integrity of the dorsal visual pathway...
  21. doi request reprint Altered expression of parvalbumin and calbindin in interneurons within the primary visual cortex of neonatal enucleated hamsters
    S Desgent
    Ecole d Optometrie, Universite de Montreal, Quebec, Canada, H3C 3J7
    Neuroscience 171:1326-40. 2010
    ..These results suggest that some features of the laminar distribution of specific CaBPs, in primary sensory cortices, are dependent upon or modulated by sensory input...
  22. ncbi request reprint When the auditory cortex turns visual
    M Ptito
    School of Optometry, CRIR, University of Montreal, CP 6128, Montreal, PQ, H3C 3JT Canada
    Prog Brain Res 134:447-58. 2001
    ..The visually responsive neurons in A1 probably account for the capacity of the auditory cortex to mediate visual behavior in 'rewired hamsters'...
  23. ncbi request reprint Retinal projections to the lateral posterior-pulvinar complex in intact and early visual cortex lesioned cats
    Denis Boire
    Ecole d Optometrie, Universite de Montreal, CP 6128 Succ Centre Ville, H3C 3J7, Montreal, Canada
    Exp Brain Res 159:185-96. 2004
    ..Retinal input to the LP-pulvinar might modulate visual responses driven by primary visual cortex or superior colliculus...
  24. doi request reprint Recruitment of the middle temporal area by tactile motion in congenital blindness
    Maurice Ptito
    Chaire de Recherche Harland Sanders, Ecole d Optometrie, Universite de Montreal, Quebec, Canada
    Neuroreport 20:543-7. 2009
    ..These results indicate that the dorsal visual pathway is activated by tactile motion stimuli in CB, therefore providing additional support for the cross-modal plasticity hypothesis...
  25. doi request reprint Partial recovery of hemiparesis following hemispherectomy in infant monkeys
    Mark W Burke
    School of Optometry, University of Montreal, Montreal, QC, Canada
    Neurosci Lett 469:243-7. 2010
    ..The upper limb gait impairment and horizontal bar crossing of lesioned subjects are reminiscent of hemiparesis seen in hemisperectomized humans with the young-lesioned subjects showing a greater propensity for recovery...
  26. doi request reprint Fatty acid amide hydrolase expression during retinal postnatal development in rats
    N Zabouri
    Laboratoire des Neurosciences de vision, Ecole d Optometrie, Universite de Montreal, Montreal, QC, Canada
    Neuroscience 195:145-65. 2011
    ..Overall these results indicate that, as shown in other structures of the brain, the eCB system could play an instrumental role in the development and function of the retina...
  27. ncbi request reprint 'Seeing' in the blind hemifield following hemispherectomy
    A Ptito
    Montreal Neurological Institute and Hospital, McGill University, 3801 University St, Montreal, PQ, H3A 2B4, Canada
    Prog Brain Res 134:367-78. 2001
    ..Because it is certain that no functional striate or extrastriate cortex remains on the ablated side, these subjects have contributed significantly to identifying the critical pathways involved in blindsight...
  28. ncbi request reprint Alterations in right posterior hippocampus in early blind individuals
    Daniel Robert Chebat
    Harland Sanders Research Chair, School of Optometry, University of Montreal, Montreal, Canada
    Neuroreport 18:329-33. 2007
    ....
  29. ncbi request reprint Regional analysis of neurofilament protein immunoreactivity in the hamster's cortex
    Denis Boire
    Ecole d Optometrie, Universite de Montreal, CP 6128 Succ Centre Ville, Montreal, Quebec, Canada H3C 3J7
    J Chem Neuroanat 29:193-208. 2005
    ..Very low SMI-32 immunoreactivity was found in orbital, insular, perirhinal, cingulate and infralimbic cortices, which are also poor in myelinated axons. This supports the association between SMI-32 immunoreactivity and myelin contents...
  30. ncbi request reprint Quantitative analysis of the retinal ganglion cell layer in the ostrich, Struthio camelus
    D Boire
    Ecole d Optometrie, Universite de Montreal, Canada
    Brain Behav Evol 58:343-55. 2001
    ..The data also showed that the degree of retinal illumination in this bird could be comparable to that noted in some nocturnal species. The findings in this study suggest that the ostrich might not be restricted to diurnal activity...
  31. doi request reprint Neuronal reduction in frontal cortex of primates after prenatal alcohol exposure
    Mark W Burke
    Department of Physiology, University of Montreal, Montreal, Quebec, Canada
    Neuroreport 20:13-7. 2009
    ..These cytoarchitectonic effects are consistent with the behavioral and cognitive changes observed in FASD...
  32. ncbi request reprint Distribution of calcium binding proteins in visual and auditory cortices of hamsters
    Sébastien Desgent
    School of Optometry, University of Montreal, CP6128 Succ Centre Ville, Montreal, Quebec, H3C 3J7, Canada
    Exp Brain Res 163:159-72. 2005
    ..They were mostly located in layer V for V1 and in layers III/IV for A1. Visual and auditory primary cortices can thus be differentiated on the basis of their immunoreactivity to specific calcium binding proteins...
  33. ncbi request reprint Development of the commissure of the superior colliculus in the hamster
    Daniel Robert Chebat
    Departement de Psychologie, Universite de Montreal, Montreal, Quebec H3C 3J7, Canada
    J Comp Neurol 494:887-902. 2006
    ..Myelinated axons appear at P11 and are very dense at P-21. Our results indicate that the CSC follows developmental schemes similar to those of the CC and the AC but that initial axon midline crossing occurs earlier...
  34. ncbi request reprint Retinal projections in the cat: a cholera toxin B subunit study
    Isabelle Matteau
    Department of Psychology, University of Montreal, Quebec, Canada, H3C 3J7
    Vis Neurosci 20:481-93. 2003
    ..The morphological characteristics of the retinal axon terminals in most of the identified novel target sites are described...
  35. pmc Transcranial magnetic stimulation of the visual cortex induces somatotopically organized qualia in blind subjects
    Ron Kupers
    Department of Surgical Pathophysiology and Positron Emission Tomography Unit, Rigshosptitalet, DK 2100 Copenhagen, Denmark
    Proc Natl Acad Sci U S A 103:13256-60. 2006
    ..These data show that the perceptual correlate of activity in a given cortical area reflects the characteristics of its novel sensory input source...
  36. doi request reprint Protein kinase A modulates retinal ganglion cell growth during development
    Anteneh Argaw
    Department of Biomedical Science, Faculty of Medicine, University of Montreal, Montreal, Quebec, Canada H3T 1J4
    Exp Neurol 211:494-502. 2008
    ..Taken together, these results suggest that the cAMP/PKA cascade is essential for the normal development of retinothalamic projections...
  37. ncbi request reprint Recovery of anterograde amnesia in a case of craniopharyngioma
    Ron C Kupers
    PET Center, Center for Functionally Integrative Neuroscience, Aarhus University and University Hospital, Norrebrogade 44, Building 30, DK 8000 Aarhus, Denmark
    Arch Neurol 61:1948-52. 2004
    ..The exact role of the mammillary bodies (MBs) in human memory remains elusive, since few cases of selective MB damage have been reported...