Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 103, Issue 46, Pages 17490-17495Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0608502103
Keywords
oblique effect; optical imaging; orientation preference; owl monkey; visuotopic maps
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Funding
- NCRR NIH HHS [1S10RR13947] Funding Source: Medline
- NEI NIH HHS [R01 EY002686, EY02686, EY08126, EY01778, R01 EY001778, P30 EY008126] Funding Source: Medline
- NHLBI NIH HHS [T32 HL007713] Funding Source: Medline
- NICHD NIH HHS [P30 HD015052, HD 15052] Funding Source: Medline
- NIGMS NIH HHS [T32 GM007347] Funding Source: Medline
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A possible neurobiological basis for the oblique effect is linked to the finding that more neural machinery is devoted to processing cardinal vs. oblique orientations in primary visual cortex (V1). We used optical imaging to determine whether more territory is devoted to processing horizontal and vertical orientations than oblique orientations in owl monkey middle temporal visual area (MT), a visual area highly sensitive to moving stimuli. We found that more of MT was devoted to representing cardinal than oblique orientations, and that the anisotropy was more prominent in parts of MT representing central vision (<= 10 degrees). Neural responses to orientations of 0 degrees and 90 degrees were also greater than those to 45 degrees and 135 degrees. In comparison, an overrepresentation of cardinal orientations in the representation of central vision in owl monkey V1 was relatively small and inconsistent. Our data could explain the greater sensitivity to motion discrimination when stimuli are moved along cardinal meridians and suggest that the neural machinery necessary to explain the motion oblique effect either originates in MT or is enhanced at this level.
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