Related Experiment Video
Updated: May 11, 2025
10:56
Quantifying Infra-slow Dynamics of Spectral Power and Heart Rate in Sleeping Mice
Published on: August 2, 2017
9.9K
CB-1 receptor agonist drastically changes oscillatory activity, defining active sleep
Irina Topchiy1,2, Bernat Kocsis1
1Department Psychiatry, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215.
Summary
Cannabis disrupts brain network activity during sleep, altering sleep stages and reducing theta rhythms essential for memory. This may explain cannabis
Area of Science:
- Neuroscience
- Pharmacology
Background:
- Brain oscillations are crucial for cognitive functions and are disrupted in neuropsychiatric disorders.
- Cannabis-1 receptor (CB1-R) activation is known to affect brain activity during wakefulness.
Purpose of the Study:
- To investigate the effects of cannabis on brain network activity during sleep.
- To understand how CB1-R activation impacts sleep architecture and oscillations.
Main Methods:
- Electrophysiological recordings in rats during different sleep stages.
- Analysis of brain oscillations, including theta rhythm and sleep spindles, during sleep.
Main Results:
- Cannabis fundamentally altered network activity during sleep, restructuring sleep episodes.
- Intermediate sleep (IS) duration increased sixfold, intruding into REM sleep (REMS).
- Theta rhythm in REMS was reduced, and sleep spindle amplitude increased with a downshifted peak frequency into the theta range.
Conclusions:
- Cannabis disrupts key sleep oscillations (theta and spindles) involved in dreaming and memory consolidation.
- These alterations in network activity may underlie the cognitive deficits and psychotic-like conditions associated with cannabis use.
- Understanding these effects provides insights into the role of brain oscillations in psychiatric pathology.
Related Concept Videos
01:19Management of Insomnia
185
The sleep cycle, an integral part of human health, consists of several stages with distinct characteristics and functions. It begins with a transition from wakefulness to sleep, known as the light sleep phase, followed by the restorative deep sleep phase, essential for physical recovery and growth. The cycle concludes with the Rapid Eye Movement (REM) phase, characterized by high brain activity and vivid dreaming. Insomnia, a prevalent sleep disorder, involves difficulty falling asleep, staying...
185
01:24Sleep-Wake Cycles
1.1K
Sleep is an essential physiological process vital to maintaining overall well-being. The reticular activating system (RAS), a network of neurons in the brainstem, regulates wakefulness and sleep. While it may seem passive, sleep consists of distinct cycles, each with its unique characteristics and functions. Two key sleep phases are non-rapid eye movement (NREM) and rapid eye movement (REM).
NREM Sleep
NREM sleep comprises four progressive stages that seamlessly merge:
NREM Sleep
NREM sleep comprises four progressive stages that seamlessly merge:
1.1K
01:17Sedatives and Hypnotics Drugs: Miscellaneous Agents
97
Sedatives and hypnotics encompass a wide range of substances, each with its unique mechanism of action, uses, and potential adverse effects.
Melatonin congeners like ramelteon (Rozerem) and tasimelteon (Hetlioz) selectively bind to melatonin receptors (MT1 and MT2) and thus mimic the actions of melatonin, a hormone that regulates sleep-wake cycles. Tasimelteon is primarily used for non-24-hour sleep-wake disorder, common in blind patients. They are also used to treat conditions like insomnia...
Melatonin congeners like ramelteon (Rozerem) and tasimelteon (Hetlioz) selectively bind to melatonin receptors (MT1 and MT2) and thus mimic the actions of melatonin, a hormone that regulates sleep-wake cycles. Tasimelteon is primarily used for non-24-hour sleep-wake disorder, common in blind patients. They are also used to treat conditions like insomnia...
97
01:22Stages of Sleep
150
Sleep progresses through distinct stages, each characterized by specific brain wave patterns and physiological responses ranging from wakefulness to stages of non-rapid eye movement, known as non-REM, to rapid eye movement, referred to as REM. Understanding these stages helps in recognizing how sleep supports various bodily and cognitive functions.
Before sleep begins, in wakefulness, the brain exhibits primarily beta waves, which are high in frequency and low in amplitude, indicating alertness...
Before sleep begins, in wakefulness, the brain exhibits primarily beta waves, which are high in frequency and low in amplitude, indicating alertness...
150
01:23Sedatives and Hypnotics: Overview
205
Sedatives are drugs that alleviate anxiety, while hypnotics induce sleep. Both classes of medication suppress neuronal activity, leading to a calming effect for sedatives and facilitating sleep for hypnotics.
Sedative-hypnotics are categorized into barbiturates, benzodiazepines (BZDs), and non-benzodiazepines or Z-drugs. These drugs work by suppressing central nervous system activity, and this suppression is dose-dependent. Older sedative medications, like barbiturates, follow a linear curve in...
Sedative-hypnotics are categorized into barbiturates, benzodiazepines (BZDs), and non-benzodiazepines or Z-drugs. These drugs work by suppressing central nervous system activity, and this suppression is dose-dependent. Older sedative medications, like barbiturates, follow a linear curve in...
205
01:15REM Sleep Behavior Disorder
110
REM Sleep Behavior Disorder (RBD) is a sleep disorder characterized by the absence of muscle paralysis that normally occurs during the REM phase of sleep. This absence allows individuals to physically act out their dreams, which are often vivid and disturbing. Common behaviors exhibited during episodes include kicking, punching, and yelling. These actions can be dangerous, potentially leading to injuries for the person with RBD or their bed partner.
RBD is significantly associated with...
RBD is significantly associated with...
110