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| Low dopamine levels may be linked to decreased motivation in long-term cannabis users Posted: 01 Jul 2013 05:32 AM PDT Scientists report that dopamine levels in a part of the brain called the striatum were lower in people who smoke more cannabis and those who began taking the drug at a younger age. Long-term cannabis users tend to produce less dopamine, a chemical in the brain linked to motivation, the study has found. |
| How brain controls sequential stepping of left and right limbs Posted: 30 Jun 2013 07:35 PM PDT A new study demonstrates that two genetically-defined groups of nerve cells control sequential stepping of left and right limbs. These neuronal cells are in control of limb alternation at different speeds of locomotion. In the absence of these cell populations, the animals' gait is disturbed. The study by Scientists at Karolinska Institutet in Sweden was published this week in the journal Nature. They report the identification of the neuronal circuits in the spinal cord of mice that control the ability to produce the alternating movements of the legs during walking. |
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