Survivor Interaction Contrast4,5

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Presentation transcript:

Survivor Interaction Contrast4,5 Evidence for Parallel Processing in the Identification of Shape and Color During Visual Search Joseph J. Glavan Joseph W. Houpt Wright State University, Dayton, Ohio Introduction Methods Survivor Interaction Contrast4,5 Conclusions Traditional visual search paradigms use search slope (RT per distractor set size) to infer serial or parallel, but this confounds workload1,2 Findlay found no evidence for or against serial, within-fixation processing of shape and color3 How does the combination of stimulus features (shape and color) affect the overall search process? Systems Factorial Technology4 is a statistical framework for assessing serial/parallel, stopping rule, and workload at group and individual levels for cognitive processes that combine at least two sources of information 21 participants in Experiment 1 22 participants in Experiment 2 704 trials, target present on ¾ of trials Participants asked to make a yes/no response if target (red circle) was present SIC(t) = [SLL(t) – SLH(t)] – [SHL(t) – SHH(t)] Decisive evidence against serial processing in Experiment 1 Results from Experiment 2 are unclear Considering the results from Experiment 1, there may not have been enough target-absent trials How could participants remain highly accurate in the task while using first-terminating (OR) processing? The next round of experiments: More trials (both overall and in the target-absent condition) The Capacity Coefficient4,5 may help distinguish between parallel-OR and coactive processing Eye Tracking S(t) = 1 – CDF(t) H:= High Saliency; L:= Low Saliency Results Accuracy was high (~97%) for all participants Response times analyzed using SIC Experiment 1 Experiment 2 19 of 21 significantly “Parallel-OR” (target-present trials) 17 of 21 significantly “Parallel-OR” (target-absent trials) 4 of 22 significantly “Parallel-OR” (target-absent trials) 1 of 22 significantly “Parallel-AND” Experimental Design Experiment 1: homogeneous distractors Experiment 1 – Target Present Trials Group Means Experiment 2: heterogeneous distractors References Wolfe, J. M. (1998). What can 1 million trials tell us about visual search?. Psychological Science, 9(1), 33-39. Townsend, J. T. (1971). A note on the identifiability of parallel and serial processes. Perception and Psychophysics, 10, 161–163. Findlay, J. M. (1997). Saccade target selection during visual search. Vision Research, 37(5), 617-631. Townsend, J. T., & Nozawa, G. (1995). Spatio-temporal properties of elementary perception: An investigation of parallel, serial and coactive theories. Journal of Mathematical Psychology, 39, 321-360. Houpt, J. W., Blaha, L. M., McIntire, J. P., Havig, P. R., & Townsend, J. T. (2014). Systems factorial technology with R. Behavioral research methods, 46(2), 307-330. Experiment 1 – Target Absent Trials Experiment 2 – Target Absent Trials Stimuli Sets Experiment 1 Experiment 2 Acknowledgements This work funded by AFOSR grant FA9550-13-1-0087.