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Long-term lead effects on the Hamilton Search Task and delayed alternation in monkeys
Neurobehavioral Toxicology and Teratology
|May 1, 1986
Summary
Early life exposure to lead causes long-term cognitive deficits in rhesus monkeys, particularly affecting attention and strategy use in tasks like Delayed Spatial Alternation.
Area of Science:
- Neuroscience
- Developmental Toxicology
- Behavioral Science
Background:
- Lead exposure during early development is a significant public health concern.
- Lead is a known neurotoxin that can impact brain development and function.
- Understanding the long-term consequences of early lead exposure is crucial for prevention and intervention.
Purpose of the Study:
- To investigate the long-term cognitive effects of early-life lead exposure in rhesus monkeys.
- To identify specific cognitive domains affected by developmental lead exposure.
- To explore potential "windows of sensitivity" during which lead exposure has the most significant impact.
Main Methods:
- Rhesus monkeys were exposed to lead during the first year of life.
- Cognitive function was assessed in adulthood (5-6 years of age) using behavioral tasks.
- Key tasks included the Delayed Spatial Alternation (DSA) and Hamilton Search Task (HST).
Main Results:
- Lead exposure resulted in significant cognitive deficits in adulthood.
- A pronounced deficit was observed in the Delayed Spatial Alternation (DSA) task, especially with short intertrial delays.
- A less robust effect was seen in the Hamilton Search Task (HST).
- Lead-treated monkeys exhibited perseveration errors in the DSA task, indicating issues with strategy and attention rather than memory.
Conclusions:
- Developmental exposure to lead can cause persistent cognitive impairments.
- The findings highlight "windows of sensitivity" to lead's neurotoxic effects during early development.
- Lead-induced cognitive deficits may involve perseveration and attentional impairments, leading to long-term functional consequences.