gaussian psychometric fitting function  (MathWorks Inc)

Journal: Frontiers in Integrative Neuroscience

Article Title: Event Related Potentials Index Rapid Recalibration to Audiovisual Temporal Asynchrony

doi: 10.3389/fnint.2017.00008

Figure Lengend Snippet: Immediate temporal perception depends on the temporal structure of the preceding trial. (A) Mean reported rate of synchrony at each of the seven SOAs binned by whether trial t−1 was audio leading (blue) or visual leading (red). Solid lines represent the Gaussian fit to the group average data. Error bars indicate the standard error of the mean. Trials preceded by a synchronous stimulus were excluded from this analysis. Note the shift in these distributions based on prior trial history. (B) Mean point of subjective simultaneity (PSS) as a function of SOA for the preceding trial. The horizontal dotted line indicates the mean PSS, while individual points indicate the PSS resulting from a Gaussian fit to all trials following the indicated SOA. Note that when audio-leads on the precedent trial, it is inconsequential by how much. On the other hand, the degree of recalibration monotonically increases as a function of the magnitude by which vision lead on the precedent trial. (C) Pearson correlation between temporal binding window (TBW) size and the shift in the PSS. Participants with larger TBWs showed greater rapid recalibration effects (i.e., changes in the PSS) r = 0.402, p = 0.042.

Article Snippet: These distributions were then fitted with a single-term Gaussian psychometric function with free parameters of amplitude, mean and standard deviation (MATLAB fit.m), consistent with previous investigations of rapid audiovisual recalibration (Van der Burg et al., ; Noel et al., ).

Techniques: Binding Assay