Australasian Mathematical Psychology Conference 2019

The integration of stimulus information in visual short-term memory

Simon D. Lilburn
Melbourne School of Psychological Sciences, The University of Melbourne
Philip L. Smith
Melbourne School of Psychological Sciences, The University of Melbourne

Multiple observation or “multiple look” procedures have been used to examine the efficiency of information integration within the visual system. The integration of information involves some form of visual memory, but investigations of visual short-term memory have largely focused on the capacity limits across manipulations of memory load rather than the memory dynamics across time. We present a near-threshold post-stimulus probed version of the standard multiple look procedure with multiple stimuli across two intervals and compare observer performance to a version of the attention-weighted sample size model. In modelling the different rate of accumulation for each presentation intervals across different stimulus exposure durations, this model provides a precise characterisation of information integration, as well as memory load, within the task. We also examine preliminary results to extend this model into the response time domain using a modified diffusion model.