Fig. 1 | Nature Communications

Fig. 1

From: Feature integration within discrete time windows

Fig. 1

The Sequential Metacontrast paradigm (SQM). A central line is followed by pairs of flanking lines. Each line is presented for 20 ms, the inter-stimulus interval (ISI) is 20 ms (except the first ISI, which is 30 ms). A percept of two diverging streams is elicited. Observers attend to one of the streams (here, the right stream) and report the perceived offset direction (right/left) by pressing hand-held push-buttons. Condition V (vernier): only the central line is offset. The offset is visible at the following lines and observers report the offset direction. Condition AV (anti-vernier): only a flanking line is offset. The offset is visible in the attended stream. Condition V-AV (vernier-anti-vernier): the central line and one of the flanking lines are offset. The two offsets are in opposite directions and cancel each other. Observers cannot report the individual vernier offsets. Condition V-PV (vernier–pro-vernier): the central line and one of the flanking lines are offset. The two offsets are in the same direction and add up. Notation: For example, V-AV3 indicates that the central line and the flanking line in frame 3 are offset in opposite directions. The red and blue offset colors are for illustration purposes only. All elements were the same color (see Methods)

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