Abstract
Picking-up and exploiting spatial and temporal regularities in the occurrence of sensory events is important for goal-directed behaviour. According to the “Predictive Coding Hypothesis” (Friston Philosophical Trans R Soc B 360(1456):815–836, 2005), these regularities are used to generate top-down predictions that are constantly compared with actual sensory events. In a previous study with the Attentional Blink (AB) paradigm, we showed that the temporal and probabilistic uncertainty of T2s that are presented outside the Attentional Blink period, i.e. at least 400 ms after T1, improves the conscious report of T2 that are presented inside the AB. The study of ERP correlated showed that this improvement was associated with a prolonged storage of pre-conscious T2 traces in extra-striate areas (Lasaponara et al. Cortex 71:15–33, 2015). Here, we tested whether variations in the probabilistic cueing of the position of a primary T1 visual target in a 4 × 4 letter array, modulate the retention of memory traces evoked by secondary letter targets (T2) that were presented in other positions of the array. Most important, in each trial, the identity of T2 was specified to participants upon disappearance of the array. We show that high probabilistic cueing facilitates T1 detection and improves the corresponding sensitivity index (d′). In contrast, retention and conscious report of secondary targets (T2) improves when the probabilistic cueing of T1 position is poor. These results suggest that uncertainty in the upcoming position of primary targets boosts the strength of memory traces evoked by secondary targets and improves the possibility that traces of secondary targets gain full access to conscious processing.
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Acknowledgements
This work was supported by grant “Ricerche di Ateneo” University La Sapienza 2018 to FD. S.L. was supported by a research grant from the Departement of Psychology (Medicine and Psychology Faculty) of University La Sapienza. Ma.P. was supported by a research grant from the Fondazione Santa Lucia IRCCS, Rome.
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Lasaponara, S., Pinto, M., Pellegrino, M. et al. Spatial uncertainty improves the distribution of visual attention and the availability of sensory information for conscious report. Exp Brain Res 238, 2031–2040 (2020). https://doi.org/10.1007/s00221-020-05862-3
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DOI: https://doi.org/10.1007/s00221-020-05862-3