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The spatial and temporal construction of confidence in the visual scene.

Graziano M, Sigman M - PLoS ONE (2009)

Bottom Line: Here we compared the dynamics of objective performance with a measure of subjective report and we observed that 1) Objective performance beyond explicit subjective reports (blindsight) was significantly more pronounced within a short temporal interval and within specific locations of the visual field which were robust across sessions 2) High confidence errors (false beliefs) were largely confined to a small spatial window neighboring the cue.The size of this window did not change in time 3) Subjective confidence showed a moderate but consistent decrease with time, independent of all other experimental factors.Our study allowed us to asses quantitatively the temporal and spatial access to an objective response and to subjective reports.

View Article: PubMed Central - PubMed

Affiliation: Physics Department, Integrative Neuroscience Laboratory, Universidad de Buenos Aires, Buenos Aires, Argentina.

ABSTRACT
Human subjects can report many items of a cluttered field a few hundred milliseconds after stimulus presentation. This memory decays rapidly and after a second only 3 or 4 items can be stored in working memory. Here we compared the dynamics of objective performance with a measure of subjective report and we observed that 1) Objective performance beyond explicit subjective reports (blindsight) was significantly more pronounced within a short temporal interval and within specific locations of the visual field which were robust across sessions 2) High confidence errors (false beliefs) were largely confined to a small spatial window neighboring the cue. The size of this window did not change in time 3) Subjective confidence showed a moderate but consistent decrease with time, independent of all other experimental factors. Our study allowed us to asses quantitatively the temporal and spatial access to an objective response and to subjective reports.

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Related in: MedlinePlus

The temporal evolution of confidence.Time course of subjective confidence responses after separating responses in correct (blue), near (red) and far (purple) errors (in which the distance between the target and the cue was smaller/larger than three), and errors in which the responded letter was neither the target nor the distractor (black). The subjective confidence decreases with time when spatial factors are factored out.
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pone-0004909-g004: The temporal evolution of confidence.Time course of subjective confidence responses after separating responses in correct (blue), near (red) and far (purple) errors (in which the distance between the target and the cue was smaller/larger than three), and errors in which the responded letter was neither the target nor the distractor (black). The subjective confidence decreases with time when spatial factors are factored out.

Mentions: We first analyzed the evolution of subjective confidence ratings as a function of ISI, which shows a monotonic decrease. To investigate whether there is a pure effect of time (independent of the other factors which covariate with ISI) in the estimate of confidence, we measured the mean confidence rate for correct responses, and for trials with errors either proximal to the target (d<3) or far from the target (d>3) or errors in which the responded letter was not one of the distractors (Figure 4). The function of confidence as a function of ISI for error trials are roughly parallel indicating that there is a main effect of ISI but without interaction between the different error types (ANOVA, main effect of ISI, F7, 7 = 5.52, P = 0.0193; main effect of error type, F2, 1.94 = 15.14, P = 0.0657; ISI * Error Type, F14, 309 = 0.89, P = 0.5718).


The spatial and temporal construction of confidence in the visual scene.

Graziano M, Sigman M - PLoS ONE (2009)

The temporal evolution of confidence.Time course of subjective confidence responses after separating responses in correct (blue), near (red) and far (purple) errors (in which the distance between the target and the cue was smaller/larger than three), and errors in which the responded letter was neither the target nor the distractor (black). The subjective confidence decreases with time when spatial factors are factored out.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC2654151&req=5

pone-0004909-g004: The temporal evolution of confidence.Time course of subjective confidence responses after separating responses in correct (blue), near (red) and far (purple) errors (in which the distance between the target and the cue was smaller/larger than three), and errors in which the responded letter was neither the target nor the distractor (black). The subjective confidence decreases with time when spatial factors are factored out.
Mentions: We first analyzed the evolution of subjective confidence ratings as a function of ISI, which shows a monotonic decrease. To investigate whether there is a pure effect of time (independent of the other factors which covariate with ISI) in the estimate of confidence, we measured the mean confidence rate for correct responses, and for trials with errors either proximal to the target (d<3) or far from the target (d>3) or errors in which the responded letter was not one of the distractors (Figure 4). The function of confidence as a function of ISI for error trials are roughly parallel indicating that there is a main effect of ISI but without interaction between the different error types (ANOVA, main effect of ISI, F7, 7 = 5.52, P = 0.0193; main effect of error type, F2, 1.94 = 15.14, P = 0.0657; ISI * Error Type, F14, 309 = 0.89, P = 0.5718).

Bottom Line: Here we compared the dynamics of objective performance with a measure of subjective report and we observed that 1) Objective performance beyond explicit subjective reports (blindsight) was significantly more pronounced within a short temporal interval and within specific locations of the visual field which were robust across sessions 2) High confidence errors (false beliefs) were largely confined to a small spatial window neighboring the cue.The size of this window did not change in time 3) Subjective confidence showed a moderate but consistent decrease with time, independent of all other experimental factors.Our study allowed us to asses quantitatively the temporal and spatial access to an objective response and to subjective reports.

View Article: PubMed Central - PubMed

Affiliation: Physics Department, Integrative Neuroscience Laboratory, Universidad de Buenos Aires, Buenos Aires, Argentina.

ABSTRACT
Human subjects can report many items of a cluttered field a few hundred milliseconds after stimulus presentation. This memory decays rapidly and after a second only 3 or 4 items can be stored in working memory. Here we compared the dynamics of objective performance with a measure of subjective report and we observed that 1) Objective performance beyond explicit subjective reports (blindsight) was significantly more pronounced within a short temporal interval and within specific locations of the visual field which were robust across sessions 2) High confidence errors (false beliefs) were largely confined to a small spatial window neighboring the cue. The size of this window did not change in time 3) Subjective confidence showed a moderate but consistent decrease with time, independent of all other experimental factors. Our study allowed us to asses quantitatively the temporal and spatial access to an objective response and to subjective reports.

Show MeSH
Related in: MedlinePlus