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Time processing in Huntington's disease: a group-control study
Christian Beste1, Carsten Saft, Jürgen Andrich
1Department of Neurology, Huntington Centre NRW, St. Josef Hospital, Ruhr-University, Bochum, Germany. christian.beste@cityweb.de
Insights
Huntington's disease (HD) selectively impairs time-estimation abilities, even before symptoms appear. Motor timing deficits were observed in both symptomatic and presymptomatic individuals with HD, highlighting early neurological changes.
Area of Science:
- Neuroscience
- Human Physiology
- Movement Disorders
Background:
- Timing processes are crucial for motor control and are mediated by neuronal networks, including the basal ganglia.
- These brain structures are implicated in the motor deficits observed in Huntington's disease (HD).
- While timing changes are noted in HD, the impact of varying motor demands on timing functions remains underexplored.
Purpose of the Study:
- To investigate the impact of motor demand on timing functions in Huntington's disease.
- To differentiate between motor and non-motor timing deficits in presymptomatic and symptomatic HD.
- To assess general motor abilities across different complexity levels in HD.
Main Methods:
- Assessed timing using a time-estimation (TE) task with high motor demand and a time-discrimination (TD) task with low motor demand.
- Evaluated general motor ability at varying complexity levels.
- Compared performance across three groups: presymptomatic HD (pHD), symptomatic HD (HD), and a control group.
Main Results:
- A decline in time-estimation (motor timing) was observed in both HD and pHD groups compared to controls.
- Non-motor timing (TD task) and general motor ability were comparable in the pHD group and controls, but better than in the symptomatic HD group.
- Timing performance in both tasks correlated with the estimated time to disease onset in the pHD group.
Conclusions:
- Huntington's disease selectively impairs time-estimation processes, evident even in presymptomatic stages.
- Time-discrimination processes were not significantly affected in either patient group.
- The relationship between timing performance and estimated age of onset has clinical implications for understanding HD progression.
Background:
"Timing" processes are mediated via a disturbed neuronal network including the basal ganglia. Brain structures important for "timing" are also discussed to be critical for the deterioration of movements in Huntington's disease (HD). Changes in "timing processes" are found in HD, but no study has varied the degree of motor demands in timing functions in parallel in HD. It may be hypothesized that timing functions may be deteriorated to a different extent in motor and non-motor timing, because in motor timing the underlying brain structures may be more demanding than in non-motor timing.
Methodology/Principle Findings:
WE ASSESSED TIMING IN TWO DIFFERENT EXPERIMENTS: a time-estimation (TE) and a time-discrimination (TD) task. The demand on motor functions is high in the TE-task and low in the TD-task. Furthermore, general motor ability was assessed at different complexity levels. A presymptomatic (pHD), a symptomatic (HD) and a control group were investigated. We found a decline in timing functions when demands on the motor system were high (TE-task), in HD and even in pHD, compared to controls. In non-motor timing (TD task) and in the assessment of general motor ability, performance in the pHD-group was comparable to the controls and better than in the symptomatic group. Performance in both timing tasks was related to the duration until the estimated age of onset in pHDs.
Conclusions/Significance:
The study shows a selective deterioration of time-estimation processes in symptomatic and even presymptomatic Huntington's disease. Time-discrimination processes were not affected in both patient groups. The relation of timing performance to the duration until the estimated age of onset in pHD is of clinical importance.
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