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Sökning: WFRF:(Patching J)

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  • Bååth, Rasmus, et al. (författare)
  • Separating predictive responses from reactive responses in isochronous finger tapping using Bayesian hierarchical modeling
  • 2013
  • Ingår i: Proceedings of the 29th Annual Meeting of the International Society for Psychophysics. ; 29, s. 72-72
  • Konferensbidrag (refereegranskat)abstract
    • Finger tapping to isochronous pacing stimuli is a well established experimental paradigm first described in the late 19th century. Two variables of common interest in rhythmic tapping tasks are timing variability and constant error. However, a difficulty when estimating these variables is that at interstimulus intervals longer than 2 seconds participants regularly overshoot the target interval and instead react to the pacing stimulus. These reactive responses result in a left skewed, non-normal response distribution, which can lead to underestimation of both the constant error and timing variability when using classical moment estimators such as the sample mean and standard deviation. A Bayesian hierarchical model is presented that models the timing responses as coming from a right censored normal distribution. Comparing this model with classical estimators using both simulated and experimental data shows that the Bayesian model measures timing variability and constant error more accurately and with less bias.
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  • Patching, Geoffrey, et al. (författare)
  • Assessing response times and force of responses to the size and brightness of visual stimuli.
  • 2013
  • Ingår i: Fechner Day 2013. Proceedings of the 29th Annual Meeting of the International Society for Psychophysics. ; 29, s. 85-85
  • Konferensbidrag (refereegranskat)abstract
    • Together with response time the force of responses to stimuli can provide important clues about cognitive and affective processes. However, while there has been much discussion of factors involved in the accurate measurement of response time (RT), key issues and assumptions in assessment of response force (RF) have been far less studied. Here, hierarchical Bayesian analysis is used to examine the extent to which changes in RTs and peak RFs to visual stimuli of increasing brightness and size arise as a result of the subjective control of force parameters. The findings show RTs to decrease with increased stimulus magnitude, but no corresponding increase in peak RFs. Yet, peak RFs were affected by instructions informing participants that the force of their responses was being measured and by auditory feedback when RF crossed a minimum criterion sufficient for RT registration. Implications of these findings for measuring RF in RT research are discussed.
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  • Resultat 1-4 av 4

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