Alex J Shepherd

Summary

Affiliation: University of London
Country: UK

Publications

  1. ncbi request reprint Color and spatial frequency are related to visual pattern sensitivity in migraine
    Alex J Shepherd
    Department of Psychological Sciences, Birkbeck, University of London, London, UK
    Headache 53:1087-103. 2013
  2. doi request reprint Motion processing deficits in migraine are related to contrast sensitivity
    Alex J Shepherd
    Department of Psychological Sciences, Birkbeck, University of London, Malet Street, London WC1E 7HX, UK
    Cephalalgia 32:554-70. 2012
  3. doi request reprint Visual metacontrast masking in migraine
    Alex J Shepherd
    University of Sydney, Australia
    Cephalalgia 31:346-56. 2011
  4. ncbi request reprint Visual pattern adaptation in subjects with photoparoxysmal EEG response: evidence for increased visual cortical excitability
    Alex J Shepherd
    School of Psychology, Birkbeck College, University of London, London, United Kingdom
    Invest Ophthalmol Vis Sci 50:1470-6. 2009
  5. doi request reprint Changes in induced hues at low luminance and following dark adaptation suggest rod-cone interactions may differ for luminance increments and decrements
    A J Shepherd
    School of Psychology, Birkbeck College, University of London, United Kingdom
    Vis Neurosci 25:387-94. 2008
  6. ncbi request reprint Local and global motion after-effects are both enhanced in migraine, and the underlying mechanisms differ across cortical areas
    A J Shepherd
    School of Psychology, Birkbeck College, University of London, London, UK
    Brain 129:1833-43. 2006
  7. ncbi request reprint Orientation discrimination and contrast detection thresholds in migraine for cardinal and oblique angles
    Marc S Tibber
    School of Psychology, Birkbeck College, University of London, London, United Kingdom
    Invest Ophthalmol Vis Sci 47:5599-604. 2006
  8. ncbi request reprint An inability to exclude visual noise in migraine
    Marc S Tibber
    Institute of Ophthalmology, University College London, London, United Kingdom
    Invest Ophthalmol Vis Sci 55:2539-46. 2014
  9. ncbi request reprint Colour vision in migraine: selective deficits for S-cone discriminations
    A J Shepherd
    School of Psychology, Birkbeck College, London WC1E 7HX, UK
    Cephalalgia 25:412-23. 2005
  10. ncbi request reprint Increased visual after-effects in migraine following pattern adaptation extend to simultaneous tilt illusion
    A J Shepherd
    School of Psychology, Birkbeck College, University of London, Malet Street, London WC1E 7HX, UK
    Spat Vis 16:33-43. 2002

Detail Information

Publications16

  1. ncbi request reprint Color and spatial frequency are related to visual pattern sensitivity in migraine
    Alex J Shepherd
    Department of Psychological Sciences, Birkbeck, University of London, London, UK
    Headache 53:1087-103. 2013
    ..To assess the potential for particular colors to alleviate visual discomfort when people with migraine view repetitive geometric or striped patterns...
  2. doi request reprint Motion processing deficits in migraine are related to contrast sensitivity
    Alex J Shepherd
    Department of Psychological Sciences, Birkbeck, University of London, Malet Street, London WC1E 7HX, UK
    Cephalalgia 32:554-70. 2012
    ..Previous studies used different displays and none adequately assessed other parameters that could affect performance, such as those that could indicate precortical dysfunction...
  3. doi request reprint Visual metacontrast masking in migraine
    Alex J Shepherd
    University of Sydney, Australia
    Cephalalgia 31:346-56. 2011
    ..Two previous studies have used metacontrast masking to assess inhibitory function in migraine and control groups, however, each used different types of masking and obtained different results...
  4. ncbi request reprint Visual pattern adaptation in subjects with photoparoxysmal EEG response: evidence for increased visual cortical excitability
    Alex J Shepherd
    School of Psychology, Birkbeck College, University of London, London, United Kingdom
    Invest Ophthalmol Vis Sci 50:1470-6. 2009
    ..In this study, cortical function in photosensitivity was assessed using two visual aftereffects that occur after prolonged adaptation...
  5. doi request reprint Changes in induced hues at low luminance and following dark adaptation suggest rod-cone interactions may differ for luminance increments and decrements
    A J Shepherd
    School of Psychology, Birkbeck College, University of London, United Kingdom
    Vis Neurosci 25:387-94. 2008
    ....
  6. ncbi request reprint Local and global motion after-effects are both enhanced in migraine, and the underlying mechanisms differ across cortical areas
    A J Shepherd
    School of Psychology, Birkbeck College, University of London, London, UK
    Brain 129:1833-43. 2006
    ..The implications of these results for alternative models of hyperexcitability are discussed...
  7. ncbi request reprint Orientation discrimination and contrast detection thresholds in migraine for cardinal and oblique angles
    Marc S Tibber
    School of Psychology, Birkbeck College, University of London, London, United Kingdom
    Invest Ophthalmol Vis Sci 47:5599-604. 2006
    ..Further, to assess whether any cortical involvement is restricted to the striate cortex or whether higher cortical areas are also involved. Orientation-specific abnormalities would provide evidence of cortical dysfunction...
  8. ncbi request reprint An inability to exclude visual noise in migraine
    Marc S Tibber
    Institute of Ophthalmology, University College London, London, United Kingdom
    Invest Ophthalmol Vis Sci 55:2539-46. 2014
    ..The aim of this study was to determine how these putative limits contribute to impoverished motion processing in migraine...
  9. ncbi request reprint Colour vision in migraine: selective deficits for S-cone discriminations
    A J Shepherd
    School of Psychology, Birkbeck College, London WC1E 7HX, UK
    Cephalalgia 25:412-23. 2005
    ..The results are discussed in terms of possible pathologies in the early visual pathways...
  10. ncbi request reprint Increased visual after-effects in migraine following pattern adaptation extend to simultaneous tilt illusion
    A J Shepherd
    School of Psychology, Birkbeck College, University of London, Malet Street, London WC1E 7HX, UK
    Spat Vis 16:33-43. 2002
    ..The results are discussed in terms of alternative models of cortical function, including a lack of excitation and reduced central energy reserves...
  11. ncbi request reprint Increased visual after-effects following pattern adaptation in migraine: a lack of intracortical excitation?
    A J Shepherd
    School of Psychology, Birkbeck College, London, UK
    Brain 124:2310-8. 2001
    ..There were no differences between migraine subgroups classified according to the presence or absence of aura. These results are discussed in terms of models of cortical function in migraine...
  12. ncbi request reprint Visual contrast processing in migraine
    A J Shepherd
    School of Psychology, Birkbeck College, London
    Cephalalgia 20:865-80. 2000
    ..These results are discussed in the context of visually induced migraine, proposed causes of abnormal cortical function in migraine and the prospects for developing clinically useful tests of visual function...
  13. ncbi request reprint Remodelling colour contrast: implications for visual processing and colour representation
    A J Shepherd
    Department of Psychology, Birkbeck College, University of London, UK
    Vision Res 39:1329-45. 1999
    ..Vision Research, 35, 239-254), the results are discussed in terms of receptor sensitivity changes and the ratio of receptor contrasts...
  14. ncbi request reprint Transient tritanopia in migraine: evidence for a large-field retinal abnormality in blue-yellow opponent pathways
    Marc S Tibber
    School of Psychology, Birkbeck College, University of London, London, United Kingdom
    Invest Ophthalmol Vis Sci 47:5125-31. 2006
    ..A group difference in the magnitude of TT would provide evidence for a retinal contribution to the S-cone-specific color-processing abnormalities that have been reported in migraine...
  15. ncbi request reprint A visual skills inventory for children with neurological impairments
    D L McCulloch
    Vision Sciences, Glasgow Caledonian University, Glasgow, Scotland, UK
    Dev Med Child Neurol 49:757-63. 2007
    ..Evaluation of visual skills in children with neurological impairment can provide valid information about the quality of children's vision. Questions with the highest validity for predicting vision are identified...
  16. ncbi request reprint Pattern-reversal visual evoked potentials in infants: gender differences during early visual maturation
    C A Malcolm
    Department of Vision Sciences, Glasgow Caledonian University, Scotland, UK
    Dev Med Child Neurol 44:345-51. 2002
    ..Studies including a wider range of ages are clearly necessary in order to establish whether the earlier peak latencies in female infants represents a difference in the onset or rate of visual maturation...