Please use this identifier to cite or link to this item: http://hdl.handle.net/11667/190
Appears in Collections:University of Stirling Research Data
Title: Spatial and chromatic properties of numerosity estimation in isolation and context
Creator(s): Gheorghiu, Elena
Goldschmitt, Dirk
Contact Email: elena.gheorghiu@stir.ac.uk
Citation: Gheorghiu, E; Goldschmitt, D (2022): Spatial and chromatic properties of numerosity estimation in isolation and context. University of Stirling. Faculty of Natural Sciences. Dataset. http://hdl.handle.net/11667/190
Publisher: University of Stirling. Faculty of Natural Sciences
Dataset Description (Abstract): Numerosity estimation around the subitizing range is facilitated by a shape-template matching process and shape-coding mechanisms are selective to visual features such as colour and luminance contrast polarity. Objects in natural scenes are often embedded within other objects or textured surfaces. Numerosity estimation is improved when objects are grouped into small clusters of same colour, a phenomena termed groupitizing, which is thought to leverage on the subitizing system. Here we investigate whether numerosity mechanisms around the subitizing range are selective to colour, luminance contrast polarity and orientation, and how spatial organisation of context and target elements modulates target numerosity estimation. Stimuli consisted of a small number (3 to 6) of target elements presented either in isolation or embedded within context elements. To examine selectivity to colour, luminance polarity and orientation, we compared target-only conditions in which all elements were either the same or different along one of these feature dimensions. We found comparable performance in the same and different feature conditions, revealing that subitizing mechanism do not depend on ‘on-off’ luminance-polarity, colour or orientation channel interactions. We also measured the effect of varying spatial organisation of (i) context, by arranging the elements either in a grid, mirror symmetric, translation symmetric or random, and (ii) target, by placing the elements either mirror symmetric, on the vertices of simple shapes or random. Our results indicate higher accuracy and lower RTs the grid compared to all other context types, with mirror symmetric, translation and random arrangements having comparable effects on target numerosity. We also found improved performance with shape-target followed by symmetric and random target arrangements in the absence and presence of context. These findings indicate that numerosity mechanisms are not selective to colour, luminance polarity and orientation, and that symmetric, translation and random context organisations inhibit target-numerosity encoding stronger than regular/grid context.
Dataset Description (TOC): Experiment 1 - Colour; Experiment 2 - Luminance contrast polarity; Experiment 3 - Orientation; Experiment 4 - Context. Please read 'Read me' file with a description of all stimulus parameters.
Type: dataset
URI: http://hdl.handle.net/11667/190
Rights: Rights covered by the standard CC-BY 4.0 licence: https://creativecommons.org/licenses/by/4.0/
Affiliation(s) of Dataset Creator(s): University of Stirling (Psychology)

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Exp2_Polarity_Accuracy.xlsx15.91 kBMicrosoft Excel XMLUnder Embargo until 1/10/2022     Request a copy
Exp2_Polarity_ReactionTime.xlsx20.2 kBMicrosoft Excel XMLUnder Embargo until 1/10/2022     Request a copy
Exp3_Orientation_Accuracy.xlsx16.04 kBMicrosoft Excel XMLUnder Embargo until 1/10/2022     Request a copy
Exp3_Orientation_ReactionTime.xlsx22.69 kBMicrosoft Excel XMLUnder Embargo until 1/10/2022     Request a copy
Exp4_Context_Accuracy.xlsx19.25 kBMicrosoft Excel XMLUnder Embargo until 1/10/2022     Request a copy
Exp4_Context_ReactionTime.xlsx22.47 kBMicrosoft Excel XMLUnder Embargo until 1/10/2022     Request a copy

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