What did Rosenzweig and Krech do?

At Berkeley, Mark Rosenzweig collaborated with biochemist Ed Bennett, psychologist David Krech and neuroanatomist Marian Diamond on studies that provided early evidence of brain plasticity, the now well-established notion that neural pathways change throughout our lives as we grow and learn.

What was the major finding of Mark Rosenzweig?

In his 1949 doctoral thesis, he demonstrated that electrodes placed on the skull could pick up “electrical activity of all the auditory stations from the cochlea to the cortex.” This meant that the “activity of subcortical centers can be studied without surgical invasion of the nervous system,” he later pointed out.

What did Mark Rosenzweig find when he reared rats in enriched environments?

They found that growing up in enriched environments affected activity of the enzyme cholinesterase in the brain. This work led in 1962 to the discovery that environmental enrichment increased cerebral cortex volume.

What did M R Rosenzweig 1984 study and what did he learn?

He is best known for his research to demonstrate neurochemical and neuroanatomical plasticity of the brain. Rosenzweig also investigated the neurochemical processes underlying the successive stages of memory formation. The latter study of Rosenzweig also showed plastic responses of the brain during hibernation.

What implications can the Rosenzweig study have on human behavior?

-Since brain plasticity is assumed to follow the same pattern in animals and humans, the implications of the study are that the human brain will also be affected by environmental factors such as intellectual and social stimulation. -The research challenged the belief that brain weight cannot change.

What does the example of Rosenzweig experiment with rats show about the effects of rich environments on brain development?

Rosenzweig found that rats living in the EC developed a heavier and thicker brain cortex. More specifically, the frontal lobes of the rats were heavier and they had developed more acetylcholine receptors. Further studies found that the brain weight of the rats can increase 7 – 10% and synapses increase by about 20%.

What is the difference in neurons between rats raised in a deprived versus enriched environment?

Results: The brains of the enriched rats were different from the impoverished rats in many ways. While there were no significant differences found in the number of brain cells (called neurons), the enriched environment produced larger neurons.

What implications can the Rosenzweig study have on human behavior quizlet?

Which area of the brain was significantly heavier and thicker in lab rats that had been exposed to an enriched environment?

cerebral cortex
The cerebral cortex of the enriched rats was significantly heavier and thicker. The cortex is the part of the brain that responds to experience and is responsible for movement, memory, learning, and all sensory input (vision, hearing, touch, taste, smell).

What does the example of Rosenzweig’s experiment with rats show about the effects of rich environments on brain development?

This study showed the effects of different environments on the brain. Rosenzweig found that rats living in the EC developed a heavier and thicker brain cortex. More specifically, the frontal lobes of the rats were heavier and they had developed more acetylcholine receptors.

Does neurogenesis continue throughout life?

Although neurogenesis continues throughout life, its rate declines with increasing age in rodents (Seki and Arai 1995; Kuhn et al 1996; Kempermann et al 2002) and non-human primates (Gould, Reeves et al 1999).

What was the significance of the study with rats quizlet?

-The enriched environment rats had developed more acetylcholine receptors in the cerebral cortex, which are important in learning and memory.