Vertical line quadrisection: ‘‘What’’ it represents and who gets the upper hand  

Oleh:

Falchook, Adam D. ; Mody, Mayur D. ; Srivastava, A. Benjamin ; Williamson, John B. ; Heilman, Kenneth M.

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: Brain and Language (Full Text) vol. 127 no. 2 (2013), page 282-288.
Topik: Line bisection and quadrisection Vertical attention Pseudoneglect Dorsal and ventral streams Focal and global attention Allocentric attention
Fulltext: 127_02_Falchook.pdf (255.64KB)

Isi artikel

Background: Normal adults demonstrate a slight upward bias (vertical pseudoneglect) when attempting vertical line bisection. The mechanism for this bias is unknown. Activation of the allocentric (object-centered) ventral visual system during attempted bisection may induce this bias. This object-centered ventral stream may also mediate focal attention. As compared to bisection, when normal participants perform a vertical line quadrisection task that requires more focal attention, they may have a greater upward bias. Methods: Sixteen participants bisected and quadrisected vertical lines. Results: The mean upward bias (deviation error) for the quadrisection tasks was significantly higher than the mean error for the line bisections. Conclusions: These results are consistent with the hypothesis that activation of the ventral stream by a task that requires focal allocentric attention can induce an upward vertical bias that is greater than the upward bias observed with allocentric line bisection, a task that requires more global attention.

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