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. 2021 Dec 20;31(24):5401–5414.e4. doi: 10.1016/j.cub.2021.09.052

Figure 7.

Figure 7

Interactions between iconic memory and central cue timing

(A) In the pre-cue condition, the central cue appeared before the discriminant segment. The neurons’ RF fell on a distal contour of the skeleton (green rectangle), which was either connected to the discriminant segment (frames with continuous lines) or not (dashed). The pair of curves with the RF could be cued (green) or non-cued (black) with the central line element.

(B) In the post-cueing conditions, the central cue appeared after the discriminant segments had disappeared. We here only illustrate conditions in which the curve pair with the RFs was cued.

(C–E) Average V1 activity across 25 recording sites in monkey M in the pre-cue condition (C), COL = 0 condition (D), and COL = 176 ms (E). Time zero corresponds to the onset of the three discriminant segments. Note that the contour element in the RF appeared at −250 ms, simultaneously with the other parts of the stimulus skeleton and before the discriminant segments (see A). The contour element in the RF was either connected to the discriminant segment (continuous traces) or not (dashed traces). The pair of curves covering the RF could be cued centrally (green) or not (black). Responses were stronger if the contour in the RF was connected to the discriminant segment than if it was not. The extra activity is called ConnMod (green and gray areas) and represents a contextual influence from outside the RF. The middle panels show the time course of ConnMod for cued and non-cued curve pairs and lower panels the difference, ΔConnMod (purple area), which represents the cueing effect. The lower panels show the time course ΔConnMod (y axis), i.e., ConnModcued − ConnModnon-cued.

(F) Behavioral d-prime based on the monkey’s accuracy (magenta line, SEM across recording sessions). We used the average ΔConnMod to estimate d-prime using linear regression (blue curve). Error bars represent SEM across recording sites.

(G) Schematic representation of ConnMod when the central cue appears at a COL of 0 ms so that the iconic memory trace for the discriminant segments (gray) is still present and can boost connectedness modulation.

See also Figure S3.