The “dual klepsydra model” (DKM) of internal time representation successfully models duration reproduction data, but relations between the DKM-based parameter κ (“loss rate”) and procedural variables (presentation modality) or individual characteristics (cognitive indices, age, sex) remained as yet unexplored. For that purpose, we re-analyzed data from an earlier time reproduction study (N = 100), using visually or acoustically presented intervals of 1–5 sec. duration. Typical values of parameter κ were ≈0.03–0.04 sec.−1, corresponding to relaxation times of internal “lossy integrators” of ≈30 sec. Significant effects of presentation modality (smaller κ values for the visual reproduction task) and of age (greater κ in acoustic reproduction with increasing age) were observed. Cognitive variables (working memory, general fluid reasoning, attention) and sex of participants were not associated with κ. Cognitive functions seem to play only a minor, if any, role at the level of time representation addressed by the DKM.
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