How are overlapping time intervals perceived? Evidence for a weighted sum of segments model

Multiple timing of nested intervals: Further evidence for a weighted sum of segments account

“…This suggests that the weighting parameter should perhaps be altered to better explain our data. It is plausible that the parameter values of the weighted sum of segments model would vary between the experiments reported in Matthews (2013) and our own experiments (present study and Bryce et al, 2015), since there were various differences between the timing contexts investigated.…”

“…Then, 500 ms after the end of the long interval, estimates of the long and the short interval were collected from the participant (always in that order). In Bryce et al (2015), both visual analog scales and reproduction were used to collect the interval estimates; the two methods produced very similar results. In this experiment, only the reproduction method was employed, since the labels of the visual analog scale might affect the estimates, especially when intervals of different durations were used.…”

“…According to this structure, the pulses emitted during each interval are collected by separate accumulators, so no summing is required, but dual-task costs are associated with having two accumulators operating simultaneously (this model was originally described by van Rijn & Taatgen, 2008). Originally, dual-task costs were modeled as affecting the timing of both intervals; however, if the timing of only the second interval suffers from dual-task costs, then this model (referred to as the SPMA adapted model) could also predict the data pattern we observed in Bryce et al (2015). This seems plausible if we imagine that perhaps the timing of the first interval is prioritized and not enough resources remain for the second accumulator to function adequately.…”

“…The two candidate models and the adapted version of the SPMA model described above were applied to this context and predictions were derived (see Fig. 1 for an illustration, and the Appendix of Bryce et al, 2015, for details of how each model was operationalized in the previous overlapping interval context).…”

Temporal discrimination of one’s own reaction times in dual-task performance: Context effects and methodological constraints

“…This explanation implies that timing is relatively intact under dual-task conditions and that the unawareness of the PRP effect occurs because only the conscious parts of Task 2 processing can be timed (see Marti et al, 2010). This implication of intact timing abilities, however, contrasts with the common notion that timing itself requires attentional resources (Block, Hancock, & Zakay, 2010;Brown, 1997;Ruthruff & Pashler, 2010), and also with recent findings that overlapping intervals cannot be timed independently even when there is no task other than timing (Bryce & Bratzke, 2016;Bryce, Seifried-Dübon, & Bratzke, 2015;van Rijn & Taatgen, 2008). Nevertheless, there is at least some indirect evidence for the implication of relatively intact timing abilities in the PRP paradigm.…”