Biomedical subjects

G L Collier

Publications and source records attributed to G L Collier.

3 recordsLinked to original sources

PubMed2001

Variance decomposition of tempo drift in isochronous rhythmic tapping.

The statistical techniques developed herein show strong promise as a nonparametric extension of the classical Wing-Kristofferson decomposition of variance in isochronous tapping to include tempo drift. It is now important to establish the relative role of the three sources of variance in discriminating among unselected individuals as well as selected populations differentiated by such factors as age, gender, and motor control impairment. We are currently making the estimation techniques available through the web, so that they can be applied to extant and new data. We can be contacted by e-mail for further information.

Extremities↗

PubMed2000

Modality differences in short-term memory for rhythms.

Prior research has established that performance in short-term memory tasks using auditory rhythmic stimuli is frequently superior to that in tasks using visual stimuli. In five experiments, the reasons for this were explored further. In a same-different task, pairs of brief rhythms were presented in which each rhythm was visual or auditory, resulting in two same-modality conditions and two cross-modality conditions. Three different rates of presentation were used. The results supported the temporal advantage of the auditory modality in short-term memory, which was quite robust at the quickest presentation rates. This advantage tended to decay as the presentation rate was slowed down, consistent with the view that, with time, the temporal patterns were being recoded into a more generic form.

Adult↗

PubMed1995

Temporal rescaling of sample and complex rations in rhythmic tapping.

Two well-established phenomena in temporal performance--preference for simple ratios over complex ratios and the ability to proportionately rescale temporal patterns--were examined together. Unlike the case with simple ratios, participants (3 trained musicians) showed only a limited ability to learn complex ratios and no ability to proportionately rescale them. These differences suggest that different mechanisms are used to produce the 2 ratio types. Systematic biases observed in the performances of the simple ratios (6 trained musicians) were modeled by assuming that an additive timing component, which is unequal for short and long intervals and changes with base rate, overlays a system that preferentially produces simple ratios. The general pattern of results was consistent with the view that rhythmic learning builds on or modifies a system of innate preferences.

Adult↗