Impairment in clock-time estimation following right hemisphere ischemic damage.

Area of Science:

• Neuroscience
• Cognitive Psychology
• Neurology

Background:

• Clock-time estimation (CTE) is a complex cognitive function.
• Understanding the neural correlates of CTE is crucial for diagnosing and managing neurological conditions.
• Previous research has explored time perception deficits after brain injury, but specific hemispheric roles require further elucidation.

Purpose of the Study:

• To assess clock-time estimation (CTE) in patients following stroke.
• To investigate potential differences in CTE deficits between patients with right hemispheric (RH) and left hemispheric (LH) lesions.
• To determine the prevalence of pathological CTE in stroke survivors compared to controls.

Main Methods:

• Evaluated CTE by asking participants to estimate the current time.
• Quantified estimation errors as minutes of advance or delay relative to actual time.
• Defined pathological CTE based on exceeding control group performance by 2.5 standard deviations.
• Included 48 stroke patients (21 RH, 27 LH) and 20 healthy controls.

Main Results:

• Clock-time estimation (CTE), but not duration estimation, was significantly impaired in stroke patients.
• Right hemispheric (RH) stroke patients exhibited a higher rate of pathological advance errors (43%) compared to left hemispheric (LH) patients (12%).
• A significant proportion of RH patients demonstrated pathological CTE deficits.

Conclusions:

• Clock-time estimation (CTE) is a vulnerable cognitive function following stroke.
• The right hemisphere plays a dominant role in clock-time estimation (CTE) in stroke patients.
• RH lesions are associated with a greater likelihood of severe CTE impairment.