Time discrimination in a monotonic, isochronous sequence

Friberg, Anders; Sundberg, Johan

doi:10.1121/1.413218

Cited by 183 publications

(172 citation statements)

References 26 publications

(17 reference statements)

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“…As was expected, hit percentages increased with the magnitude of the hesitation. The detection threshold (50% correct) in the isochronous precursor condition was about 18 msec (close to 4% of the IOI duration), which is consistent with previous studies (Friberg & Sundberg, 1995;Repp, 2000a). However, it was higher in the randomly timed precursor condition;that is, there were fewer correct detection responses.…”

Section: Resultssupporting

confidence: 79%

Perception of timing is more context sensitive than sensorimotor synchronization

Repp

2002

Perception & Psychophysics

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Section: Resultssupporting

confidence: 79%

Perception of timing is more context sensitive than sensorimotor synchronization

Repp

2002

Perception & Psychophysics

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“…Unlike single-interval mechanisms being based on absolute duration, those additional mechanisms would use the presence of a regular beat as an alternative reference frame for the timing of intervals relative to the beat. Psychophysical data from previous studies in normals support a dissociation between mechanisms for duration-based as opposed to beat-based timing of intervals and rhythmic sequences (20,21,32,(34)(35)(36)(37)(38). The preservation of relative timing tasks is not consistent with the idea that the cerebellum provides a single mechanism subserving both single-interval and beat-based timing; rather, the data suggest one or more mechanisms of perceptual entrainment with a regular beat that are independent of single-interval timing and can occur despite cerebellar damage.…”

Section: Discussionmentioning

confidence: 95%

Dissociation of duration-based and beat-based auditory timing in cerebellar degeneration

Grube

Cooper

Chinnery

et al. 2010

Proc. Natl. Acad. Sci. U.S.A.

168

183

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This work tests the hypothesis that the cerebellum is critical to the perception of the timing of sensory events. Auditory tasks were used to assess two types of timing in a group of patients with a stereotyped specific degeneration of the cerebellum: the analysis of single time intervals requiring absolute measurements of time, and the holistic analysis of rhythmic patterns based on relative measures of time using an underlying regular beat. The data support a specific role for the cerebellum only in the absolute timing of single subsecond intervals but not in the relative timing of rhythmic sequences with a regular beat. The findings support the existence of a stopwatch-like cerebellar timing mechanism for absolute intervals that is distinct from mechanisms for entrainment with a regular beat.T he relevance of the human cerebellum to the perception of time intervals and rhythmic sequences is controversial. Involvement of the cerebellum in perceptual timing (the perception of the timing of sensory events), in addition to its role in motor timing (the timed execution of movements), has been suggested by a number of studies (1-6). One distinction that we wish to address here, which has not been made clear in previous work, is between the absolute, duration-based timing of single subsecond intervals and the relative timing of subsecond intervals based on a regular beat. Functional imaging studies suggest neural activity in the human cerebellum during the perception of the absolute duration of single time intervals (7,8) as well as rhythmic patterns with a regular beat (9-13). However, previous lesion work to assess an obligatory cerebellar role in the perception of single time intervals has not yielded consistent results (4,(14)(15)(16)(17). Previous lesion work to assess any obligatory role of the cerebellum in the analysis of rhythmic sequences has assessed only deficits in related motor activity, such as tapping out a beat (4,14,18), that do not allow clear inference about perception.In this study, we test whether the cerebellum is a critical substrate for perceptual tasks that require the absolute, durationbased analysis of single time intervals as well as those that require the relative analysis of time intervals within rhythmic patterns based on a regular beat. Perceptual tests were conducted in the auditory domain, where accurate temporal encoding of sensory events is essential and entrainment with a beat is induced naturally. Tasks were administered to a group of 34 patients with a stereotyped cerebellar degeneration and a matched control group of 40 healthy individuals. Two absolute timing tasks tested the perception of single intervals for a variable and a fixed reference duration, respectively ( Fig. 1 A and B). Three relative timing tasks tested the beat-based analysis of rhythmic sequences, including the detection of the presence of a roughly regular beat (19), a deviation from an isochronous beat (20) and a distortion of a rhythmic pattern with a metrical beat (21) (Fig. 1 C-E). The data support a ce...

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“…1). The 15 and 50 ms shift magnitudes were chosen, on the basis of relevant psychophysical work, as values likely to be below and above perception threshold respectively (Friberg and Sundberg, 1995;Repp, 2000). The experiment consisted of 12 experimental blocks.…”

Section: Methodsmentioning

confidence: 99%

Neurophysiological correlates of error correction in sensorimotor-synchronization

et al. 2003

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In a sensorimotor synchronization task requiring subjects to tap in synchrony with an auditory stimulus, occasional perturbations (i.e., interval changes) in an otherwise isochronous sequence of auditory metronome stimuli are known to be compensated remarkably swift and with surprising precision, even when they are too small to be consciously perceived. To investigate the neural substrate and the informational basis of error correction in sensorimotor synchronization, we recorded movement-related, auditory-evoked, and error-related EEG potentials. Experiment 1 confirmed rapid adjustment to stimulus phase shifts, with faster correction of large (50 ms) compared to small (15 ms) shifts. In addition to being corrected faster, there was overcorrection of the 50 ms shifts, attributed to engagement of period correction mechanisms. For ϩ50 ms shifts, a neural correlate of period correction was identified in the form of medial frontal cortex activation, preceded by an error-related brain potential (ERN). Auditory-evoked potential (AEP) amplitudes were sensitive to stimulus phase shifts of both large and small magnitude. Further experiments with a smaller magnitude 10 ms phase shift (Experiment 2) and passive auditory stimulation (Experiment 3) provided evidence that the modulation of AEP amplitudes is not due to metronome interval changes, but may represent auditory-somatosensory activation. Together, behavioral and neurophysiological data support the hypothesis that phase correction is a largely automatic process, not dependent on conscious perception of changes in timing. By contrast, perceivable phase shifts may invoke timekeeper adjustments accompanied by medial frontal cortex activity.

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Time discrimination in a monotonic, isochronous sequence

Cited by 183 publications

References 26 publications

Perception of timing is more context sensitive than sensorimotor synchronization

Perception of timing is more context sensitive than sensorimotor synchronization

Dissociation of duration-based and beat-based auditory timing in cerebellar degeneration

Neurophysiological correlates of error correction in sensorimotor-synchronization

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