Tracking difficulties and paranoid ideation during hashish and alcohol intoxication

Area of Science:

• Neuroscience
• Psychopharmacology
• Cognitive Psychology

Background:

• Understanding the differential cognitive effects of various psychoactive substances is crucial for public health and safety.
• Cannabis, particularly delta-9-tetrahydrocannabinol (THC), is widely used, yet its specific cognitive impacts compared to alcohol require detailed investigation.

Purpose of the Study:

• To compare the cognitive effects of tetrahydrocannabinol (THC) against alcohol and placebo under controlled conditions.
• To investigate the influence of administration speed on THC-induced cognitive alterations.

Main Methods:

• A double-blind, within-subjects design was employed with 6 healthy participants.
• Participants received 20 mg of THC (administered over 10-min or 45-min), placebo, or alcohol (matched for intoxicating effect).
• Cognitive functions assessed included information tracking, self-other interpersonal perceptions, and persecutory ideation.

Main Results:

• Rapid THC administration (10-min) caused significantly greater impairments in information tracking, self-other perceptions, and increased persecutory ideation compared to alcohol or placebo.
• Slower THC administration (45-min) also resulted in notable, though less pronounced, cognitive disruptions.
• A significant correlation was observed between difficulties in tracking, altered self-other metaperspectives, and persecutory ideation.

Conclusions:

• Tetrahydrocannabinol (THC) poses a greater risk for specific cognitive impairments, particularly under rapid exposure, than equiintoxic doses of alcohol.
• The findings highlight THC's distinct impact on temporal information processing, social cognition, and paranoid ideation.