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. 1999 Mar 16;96(6):2585-7.
doi: 10.1073/pnas.96.6.2585.

Attention and primary visual cortex

M I Posner  1 , C D Gilbert
Affiliations

Attention and primary visual cortex

M I Posner et al. Proc Natl Acad Sci U S A. .
No abstract available

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Figures

Figure 1
Figure 1
Examples of the stimuli used to explore attentional modulation in primary visual cortex. (a) Two stimuli, one inside the receptive field and the other outside, one of which is the attended stimulus (5). (b) A central stimulus consisting of a string of letters presented sequentially, where the observer has to indicate whether the string is the same or different as those on a prior trial and a peripheral stimulus consisting of a rotating grating, where the observer has to indicate the direction of rotation (1). (c) A T centered in a field of crosses, where the observer has to indicate the orientation of the T (up or down) in the attended visual field (17). (d) An array of pairs of colinear lines (one inside the receptive field and one outside) where the observer has to indicate the brightness of a target line as either brighter or dimmer than the reference line located near the fixation point (cross). Under some conditions, the observer is cued to the position of the target line (focal attention) or to all possible target locations (distributed attention). The flanking line placed outside the receptive field facilitates the response of the cell to the target line placed inside the receptive field, and this facilitation is modulated by attention (11). (e) Two lines are presented, one of which connects the fixation point (cross) to a target (circle) and one of which intersects only the target. The subject attends to the connected line, which on some trials passes through the receptive field (Left) and on other trials does not (Right) (20).
See this image and copyright information in PMC

Comment on

References

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