Abstract
The current model of the Episodic Temporal Generalization task, where subjects have to judge whether pairs of auditory stimuli are equal in duration, predicts that results are scale-free and unaffected by the presentation order of the stimuli. To test these predictions, we conducted three experiments assessing sub- and supra-second standards and taking presentation order into account. Proportions were spaced linearly in Experiments 1 and 2 and logarithmically in Experiment 3. Critically, we found effects of duration range and presentation order with both spacing schemes. Our results constitute the first report of presentation order effects in the Episodic Temporal Generalization task and demonstrate that future studies should always consider duration range, number of trials and presentation order as crucial factors modulating performance.
Highlights
Time has been a matter of ardent debate across many disciplines[1]
We report the magnitude of the TOE as a percentage of the standard (%TOE)29. %TOEs were submitted to a rm-ANOVA with standard duration (Sub-second/ Supra-second) and order (S-C/C-S) as factors
Supra-second condition are shifted to the left and right in the S-C and C-S orders, respectively. This part of the analysis revealed that the asymmetries of temporal generalization gradients were not equal between the two duration ranges considered
Summary
Time has been a matter of ardent debate across many disciplines[1]. Within neuroscience, does it constitute an important topic in its own right[2], but it impinges on the field’s fundamental areas of inquiry, including consciousness[3], motor control[4], memory[5], artificial intelligence[6], and neural dynamics[7]. This controversy is epitomized by the antinomy between two major conceptual frameworks used to account for timing mechanisms in the brain: the “common timing hypothesis” and the “distinct timing hypothesis”[14]. Whereas the former assumes a single timing mechanism irrespective of duration, the latter posits dissociable mechanisms for sub- and supra-second durations. A typical approach to study time perception is to have participants judge whether two durations are equal[15]. This so-called Temporal Generalization task has two main versions for humans. Stimuli are constructed in a similar way for both versions: a set of comparison durations is generated multiplying a standard duration (e.g., 400 ms, or values from a range such as 300 to 500 ms) by a series
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