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Ben-Gurion University of the Negev Dept. of Brain and Cognitive Sciences NEURAL DATA-ANALYSIS WORKSHOP REACTION TIMES (RT) The basic premise underlying the use of RT in cognitive psychology is the assumption that cognitive operations take a certain and measurable amount of time . In addition, it is assumed that additional mental processes add (more or less) linearly. If this is the case, increased RT reflect additional mental processes. Let us assume for the time being that this is a reasonable framework. Then, it is highly useful to have a program that allows you to quickly collect RT data THE VISUAL SEARCH PARADIGM In the visual search task participants are asked to report the presence or absence of a target stimulus among various numbers of distracter stimuli. If the distracter stimuli differ by a single feature you usually find the “pop-out” effect: the RT to detect the target is independent of the number of distracters. Conversely, if more than one stimulus dimension has to be considered (conjunction search), you typically find a linear relationship between RT and the number of distracters. This pattern of results suggests the existence of feature primitives, fundamental dimensions that organize and govern human perception. VISUAL SEARCH Feature search Conjunction search O X X O X X O X O O O O X O O O O O O X O O O O X O O X VISUAL SEARCH DEMO OF THE PROJECT Demo in MATLAB EXPECTED RESULTS Correctly Identified the Presence of Target 2.6 Mean Reaction Time (sec) 2.4 Pop Out Conjunction 2.2 2 1.8 1.6 1.4 1.2 1 4 6 8 10 Set Size 12 14 16 EXPECTED RESULTS Correctly Identified the Absence of Target 4 Pop Out Conjunction Mean Reaction Time (sec) 3.5 3 2.5 2 1.5 1 4 6 8 10 Set Size 12 14 16