Dataset Open Access

Integration of serial sensory information in haptic perception of softness

Metzger, Anna; Lezkan, Alexandra; Drewing, Knut

Redundant estimates of an environmental property derived simultaneously from different senses or cues are typically integrated  according to the Maximum Likelihood Estimation model (MLE): Sensory estimates are weighted according to their reliabilities,  maximizing the percept"s reliability. Mechanisms underlying the integration of sequentially derived estimates from one sense are less clear. Here we investigate the integration of seriallysampled redundant information in softness perception. We developed a  method to manipulate haptically perceived softness of silicone rubber stimuli during bare finger exploration. We then manipulated softness estimates derived from single movement segments (indentations) in a multi-segmented exploration to assess their  contributions to the overall percept. Participants explored two stimuli in sequence, using 2-5 indentations and reported which stimulus felt softer. Estimates of the first stimulus' softness contributed to the judgments similarly, whereas for the second stimulus  estimates from later as compared to earlier indentations contributed less. In line with unequal weighting, the percept"s reliability  increased with increasing exploration length less than predicted by the MLE model. This pattern of results is well explained by  assuming that the representation of the first stimulus fades when the second stimulus is explored, which fits with a   neurophysiological model of perceptual decisions (Deco et al., 2010).

 

There are zip files for every experiment (1 & 2a-d), which contain all data relative to the publication. The data of each participant is contained in a separate folder. This folder contains a *.raw file for each session of the experiment and a "data" folder, which contains movement trajectories (*.trj files) and the staircase reversals for each condition (*.pse files) in separate folders for each session. In every experiment folder there is a list of trials which were excluded from the analyses.

Variables of Experiment 1 are described in the file VARIABLE_CODES_EXP1.txt and the variables of Experiment 2a-d are described in the file VARIABLE_CODES_EXP2.txt.

 

Files (1.7 GB)
Name Size
Experiment1_data.zip
md5:267203269df88f19cbf8d2ed6ccb5eff
220.0 MB Download
Experiment2a_data.zip
md5:1a02f2f8d867842fbd7874d478b9d493
125.6 MB Download
Experiment2b_data.zip
md5:fe5fce3244b177cb122626b0b5aa6083
175.0 MB Download
Experiment2c_data.zip
md5:cc1bda7b8cc96b086799e2c60861d63f
425.6 MB Download
Experiment2d_data.zip
md5:aca7ae8a6bfdc14d205ada18d5580175
751.9 MB Download
VARIABLE_CODES_EXP1.txt
md5:d777205ebeab59037709dcccd31939f5
2.2 kB Download
VARIABLE_CODES_EXP2.txt
md5:a7e7451274b3554de7a15dec1f8c5df4
2.4 kB Download
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