Decomposing skin conductance into tonic and phasic components Export

@article{Lim97, abstract = {Overlapping phasic skin conductance responses (SCRs) obtained using short interstimulus interval (ISI) paradigms such as those employed in cognitive research, confound measurement of each discrete phasic SCR as well as the tonic skin conductance level (SCL). We report a method of resolving this problem using a modelling technique that takes advantage of the stereotyped nature of the within-subject SCR waveform. A four-parameter sigmoid-exponential SCR model that describes the entire response, was developed and extended to five-, six- and eight-parameter skin conductance (SC) models. These SC models were successfully curve-fitted to more than 60 SC segments, each containing one SCR or two overlapping SCRs on a sloping baseline obtained from 20 normal subjects. The SC segments were consequently decomposed into their components: the tail of the previous response, one or two SCRs and the SCL. The SCRs free of the complication of overlap were then quantified. The raw SCRs of the same data set were also measured using a standard method. The standard measurement showed a significant reduction of 15\% in amplitude and 140 ms in peak latency compared to our method. The basic four SCR model parameters--onset time, rise time, decay time constant and gain--showed increasing inter-subject variability in that order. These SCR model parameters may be studied as variables in normal and patient groups and as indices of treatment response. This quantitative method also provides a means to assess the relationships between central and autonomic psychophysiologic measures. (c) 1997 Elsevier Science B.V.}, author = {Lim, Chong L. and Rennie, Chris and Barry, Robert J. and Bahramali, Homayoun and Lazzaro, Ilario and Manor, Barry and Gordon, Evian}, citeulike-article-id = {2507027}, citeulike-linkout-0 = {http://dx.doi.org/10.1016/S0167-8760(96)00713-1}, citeulike-linkout-1 = {http://linkinghub.elsevier.com/retrieve/pii/S0167-8760(96)00713-1}, citeulike-linkout-2 = {http://www.sciencedirect.com/science/article/B6T3M-4BJN36M-2/2/641a81dfa4510ffad5dd579e6398254f}, doi = {10.1016/S0167-8760(96)00713-1}, journal = {International Journal of Psychophysiology}, keywords = {detection, emotion, gsr, method, ngd}, month = {February}, number = {2}, pages = {97--109}, posted-at = {2008-11-21 10:22:49}, priority = {2}, title = {Decomposing skin conductance into tonic and phasic components}, url = {http://dx.doi.org/10.1016/S0167-8760(96)00713-1}, volume = {25}, year = {1997} }

TY - JOUR ID - Lim97 L3 - citeulike-article-id:2507027 N2 - Overlapping phasic skin conductance responses (SCRs) obtained using short interstimulus interval (ISI) paradigms such as those employed in cognitive research, confound measurement of each discrete phasic SCR as well as the tonic skin conductance level (SCL). We report a method of resolving this problem using a modelling technique that takes advantage of the stereotyped nature of the within-subject SCR waveform. A four-parameter sigmoid-exponential SCR model that describes the entire response, was developed and extended to five-, six- and eight-parameter skin conductance (SC) models. These SC models were successfully curve-fitted to more than 60 SC segments, each containing one SCR or two overlapping SCRs on a sloping baseline obtained from 20 normal subjects. The SC segments were consequently decomposed into their components: the tail of the previous response, one or two SCRs and the SCL. The SCRs free of the complication of overlap were then quantified. The raw SCRs of the same data set were also measured using a standard method. The standard measurement showed a significant reduction of 15% in amplitude and 140 ms in peak latency compared to our method. The basic four SCR model parameters--onset time, rise time, decay time constant and gain--showed increasing inter-subject variability in that order. These SCR model parameters may be studied as variables in normal and patient groups and as indices of treatment response. This quantitative method also provides a means to assess the relationships between central and autonomic psychophysiologic measures. (c) 1997 Elsevier Science B.V. IS - 2 JF - International Journal of Psychophysiology EP - 109 TI - Decomposing skin conductance into tonic and phasic components VL - 25 SP - 97 KW - detection KW - emotion KW - gsr KW - method KW - ngd AU - Lim, Chong AU - Rennie, Chris AU - Barry, Robert AU - Bahramali, Homayoun AU - Lazzaro, Ilario AU - Manor, Barry AU - Gordon, Evian PY - 1997/02// UR - http://dx.doi.org/10.1016/S0167-8760(96)00713-1 ER -