Common Cortical Loci Are Activated during Visuospatial Interpolation and Orientation Discrimination Judgements

Article English OPEN
Tibber, Marc S. ; Anderson, Elaine J. ; Melmoth, Dean R. ; Rees, Geraint ; Morgan, Michael J. (2009)
  • Publisher: Public Library of Science
  • Journal: PLoS ONE, volume 4, issue 2 (issn: 1932-6203, eissn: 1932-6203)
  • Related identifiers: pmc: PMC2642631, doi: 10.1371/journal.pone.0004585
  • Subject: Q | Neuroscience/Experimental Psychology | R | RE | Research Article | LATERAL OCCIPITAL COMPLEX, HUMAN EXTRASTRIATE CORTEX, HUMAN VISUAL-SYSTEM, OBJECT IDENTIFICATION, HUMAN BRAIN, SURFACE-ORIENTATION, PARIETAL CORTEX, NEGATIVE BOLD, ANATOMICAL LANDMARK, RECEPTIVE-FIELDS | Science | Neuroscience/Sensory Systems | Neuroscience/Natural and Synthetic Vision | Medicine | Neuroscience/Psychology | Neuroscience/Motor Systems

There is a wealth of literature on the role of short-range interactions between low-level orientation-tuned filters in the perception of discontinuous contours. However, little is known about how spatial information is integrated across more distant regions of the visual field in the absence of explicit local orientation cues, a process referred to here as visuospatial interpolation (VSI). To examine the neural correlates of VSI high field functional magnetic resonance imaging was used to study brain activity while observers either judged the alignment of three Gabor patches by a process of interpolation or discriminated the local orientation of the individual patches. Relative to a fixation baseline the two tasks activated a largely over-lapping network of regions within the occipito-temporal, occipito-parietal and frontal cortices. Activated clusters specific to the orientation task (orientation. interpolation) included the caudal intraparietal sulcus, an area whose role in orientation encoding per se has been hotly disputed. Surprisingly, there were few task-specific activations associated with visuospatial interpolation (VSI. orientation) suggesting that largely common cortical loci were activated by the two experimental tasks. These data are consistent with previous studies that suggest higher level grouping processes-putatively involved in VSI-are automatically engaged when the spatial properties of a stimulus (e. g. size, orientation or relative position) are used to make a judgement.
  • References (85)
    85 references, page 1 of 9

    1. Hubel DH, Wiesel TN (1968) Receptive fields and functional architecture of monkey striate cortex. J Physiol 195(1): 215-243.

    2. Ringach DL (2004) Mapping receptive fields in primary visual cortex. J Physiol 558(Pt 3): 717-728.

    3. Marr D (1982) Vision. A computational investigation into the human representation and processing of visual information. Freeman WHC.

    4. Field DJ, Hayes A, Hess RF (1993) Contour integration by the human visual system: evidence for a local ''association field''. Vision Res 33(2): 173-193.

    5. Hess RF, Dakin SC (1997) Absence of contour linking in peripheral vision. Nature 390(6660): 602-604.

    6. Field D, Hayes A (2001) Contour Integration and the Lateral Connections of V1 Neurons. In: Chalupa LM, JS Wener JS, eds. The Visual Neurosciences MIT Press. pp 1069-1079.

    7. Hess R, Field D (1999) Integration of contours: new insights. Trends Cogn Sci 3(12): 480-486.

    8. Watt RJ (1984) Towards a general theory of the visual acuities for shape and spatial arrangement. Vision Res 24(10): 1377-1386.

    9. Morgan MJ, Ward RM, Hole GJ (1990) Evidence for positional coding in hyperacuity. J Opt Soc Am A 7(2): 297-304.

    10. Toet A, Koenderink JJ (1988) Differential spatial displacement discrimination thresholds for Gabor patches. Vision Res 28(1): 133-143.

  • Related Research Results (2)
  • Metrics
    No metrics available
Share - Bookmark