The Spiking Search over Time and Space Model (sSoTS): Simulating Dual Task Experiments and the Temporal Dynamics of Preview Search
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The visual information we receive in the real world is usually prioritized through time as well as space. Evidence presented by Watson and Humphreys  supports the view that new information in search tasks is prioritised by (amongst other processes) active ignoring of old items - a process they termed visual marking. In this work we present, an explicit computational model of visual marking using biologically plausible activation functions. The ”spiking search over time and space” model (sSoTS) incorporates different synaptic components (NMDA, AMPA, GABA) and a frequency adaptation mechanism based on [Ca2 + ] sensitive K + current. This frequency adaptation current when coupled with a process of active inhibition applied to old items, leads to old items being de-prioritised (and new items prioritised) across time in search. Furthermore, sSoTS can simulate the temporal dynamics of preview search  and dual task experimental results  . The results indicate that the sSoTS model can provide a biologically plausible account of human search over time as well as space.
KeywordsVisual search over time temporal dynamics of visual marking dual task integrate-and-fire neurons frequency adaptation
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- 1.Agter, A., Donk, M.: Prioritized selection in visual search through onset capture and color inhibition: Evidence from a probe-dot detection task. Journal of Experimental Psychology: Human Perception and Performance 31, 722–730 (2005)Google Scholar
- 3.Braithwaite, J.J., Humphreys, G.W., Hulleman, J., Watson, D.G.: East color grouping and slow color inhibition: Evidence for distinct temporal windows for separate processes in preview search. Journal of Experimental Psychology (in press)Google Scholar
- 4.Brunel, N., Wang, X.: Effects of neuromodulation in a cortical networks model of object working memory dominated by current inhibition. Journal of Computational Neuroscience, 63–85 (2001)Google Scholar
- 8.Humphreys, G.W., Jolicoeur, P., Watson, D.: Fractionating the preview benefit in search: Dual-task decomposition of visual marking by timing and modality. Journal of Experimental Psychology: Human Performance and Perception 28(3), 640–660 (2002)Google Scholar
- 10.Humphreys, G.W., Kyllinsbaek, S., Watson, D., Olivers, C.N.L., Law, I., Paulson, P.: Parieto-occipital areas involved in efficient filtering in search: A time course analysis if visual marking using behavioural and functional imaging procedures. Quarterly Journal of Experimental Psychology 57A, 610–635 (2004)CrossRefGoogle Scholar
- 16.Posner, M., Cohen, Y.: Attention and performance x: Control of language processes. Lawrence Erlbaum Assoc. In: Bouma, H., Bouwhuis, D. (eds.) Components of visual orienting (1984)Google Scholar
- 17.Rolls, E., Treves, A.: Neural Networks and Brain Function. Oxford University Press, Oxford (1998)Google Scholar
- 19.Watson, D., Humphreys, G.W.: Visual marking of moving objects: A role for top-down feature based inhibition in selection. Journal of Experimental Psychology 24, 946–962 (1998)Google Scholar
- 24.Yantis, S., Jonides, J.: Abrupt visual onset and selective attention: Evidence from visual search. Journal of Experimental Psychology 10, 601–621 (1984)Google Scholar