• myGriffith
    • Staff portal
    • Contact Us⌄
      • Future student enquiries 1800 677 728
      • Current student enquiries 1800 154 055
      • International enquiries +61 7 3735 6425
      • General enquiries 07 3735 7111
      • Online enquiries
      • Staff phonebook
    View Item 
    •   Home
    • Griffith Research Online
    • Conference outputs
    • View Item
    • Home
    • Griffith Research Online
    • Conference outputs
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

  • All of Griffith Research Online
    • Communities & Collections
    • Authors
    • By Issue Date
    • Titles
  • This Collection
    • Authors
    • By Issue Date
    • Titles
  • Statistics

  • Most Popular Items
  • Statistics by Country
  • Most Popular Authors
  • Support

  • Contact us
  • FAQs
  • Admin login

  • Login
  • Reflexive OKN with partial and full field stimulation: effects of age and light level

    Author(s)
    Hine, Trevor
    Wallis, G
    Wood, J.
    Stavrou, E.
    Griffith University Author(s)
    Hine, Trevor J.
    Year published
    2006
    Metadata
    Show full item record
    Abstract
    We recorded reflexive OKN in ten younger (32.3ᵮ98 years) and older (65.6ᶮ53) visually normal subjects under viewing conditions designed to differentiate M-pathway functioning from other pathways. Subjects were required to gaze straight ahead while viewing vertical gratings of either 0.43 or 1.08 cpd, drifting at either 5 or 20௳ec and presented at either 8 or 80% contrast. Gratings were presented as full field stimulation, central stimulation or peripheral (>15੠stimulation. The order of presentation of conditions was pseudo-randomised at two blocked light levels: 'mesopic' or twilight conditions (1.8 cdm-2) and 'photopic' or ...
    View more >
    We recorded reflexive OKN in ten younger (32.3ᵮ98 years) and older (65.6ᶮ53) visually normal subjects under viewing conditions designed to differentiate M-pathway functioning from other pathways. Subjects were required to gaze straight ahead while viewing vertical gratings of either 0.43 or 1.08 cpd, drifting at either 5 or 20௳ec and presented at either 8 or 80% contrast. Gratings were presented as full field stimulation, central stimulation or peripheral (>15੠stimulation. The order of presentation of conditions was pseudo-randomised at two blocked light levels: 'mesopic' or twilight conditions (1.8 cdm-2) and 'photopic' or full light conditions (71.5 cdm-2). For the partial fields, central stimulation, mesopic light level, lower temporal frequencies (i.e. number of stripes passing per second) each contributed to greater OKN strength as measured by slow-phase velocity (SPV). For full field stimulation, and especially for higher temporal frequencies and low contrast, there was a significant interaction between age group נlight level (p = 0.017): SPV diminished much more among the older than the younger group for the twilight condition compared to full light. Such a clear diminution in M-pathway sensitivity revealed by OKN response has important implications for everyday situations like crash avoidance under twilight driving conditions.
    View less >
    Conference Title
    Australian Journal of Psychology
    Publisher URI
    http://www.psychology.org.au/
    Subject
    Psychology
    Cognitive Sciences
    Publication URI
    http://hdl.handle.net/10072/16389
    Collection
    • Conference outputs

    Footer

    Disclaimer

    • Privacy policy
    • Copyright matters
    • CRICOS Provider - 00233E

    Tagline

    • Gold Coast
    • Logan
    • Brisbane - Queensland, Australia
    First Peoples of Australia
    • Aboriginal
    • Torres Strait Islander