Behavioral Effects of Marihuana

Clark, Lincoln D.

doi:10.1001/archpsyc.1970.01750030001001

Cited by 120 publications

(35 citation statements)

References 2 publications

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“…Whatever the case, it is certainly clear that THC has a unique profile of effects: It has stimulant like effects on time judgment and CNV in contrast to its sedative-like effects on most other cognitive and perfor mance tasks. Thus, little evidence seems to exist in sup port of conclusions such as that of Clark et al [ 1970] that the 'distortion of time sense is incident to the effects on perception, memory, and organization of thought'.…”

Section: Discussionmentioning

confidence: 99%

Cannabis, Atropine, and Temporal Information Processing

Re¹,

Mayo

et al. 1984

Neuropsychobiology

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In experiment 1, subjects judged time by duration production under no-counting instructions. The productions were made following intravenous injection of atropine sulfate or saline, and after smoking cigarettes with and without (–)-Δ⁹-tetrahydrocannabinol (THC). THC increased the subjective time rate (STR); i.e., the rate at which subjective time passes relative to clock time, whereas atropine had no effect on STR. Thus, reduction in central acetylcholine activity is not a sufficient explanation of THC’s effect on STR. Experiment 2 replicated the THC effect on STR when subjects were counting subjective seconds. This result indicates that THC affects the experience of time as it is passing, and not solely the memory for duration experience after a time period.

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Section: Discussionmentioning

confidence: 99%

Cannabis, Atropine, and Temporal Information Processing

Re¹,

Mayo

et al. 1984

Neuropsychobiology

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“…Note that the separate choice response speed categories given on the abscissa are of different sizes. tim e and choice latency in short-term memory experiments have been shown to increase under marihuana (Clark et al, 1970;Darley et ai , 1973). Additionally, /l9 -THe is known to increase the proportion of longer latency incorrect matching trials as compared to nondrug matching performance.…”

Section: Discussionmentioning

confidence: 99%

Effects of Δ9-tetrahydrocannabinol on delayed matching-to-sample choice speeds in chimpanzees

Grilly

Ferraro

1973

Bull. Psychon. Soc.

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The effects of A 9 -THC on choice response speeds in chimpanzee short-term recognition memory were assessed in a delayed matching-to-sample task. Choice speeds were faster on correct than on incorrect trials and were inversely related to delay length. Although A 9 -THC lowered matching accuracy, it did not affect any aspect of choice speed, These results were interpreted as indicating that the disruption of short-term recognition memory produced by A 9 -THC reflects changes in acquisition-storage processes rather than in memory retrieval processes.

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“…On the other hand, it has been suggested that marijuana affects central processing such that discrete periods of reduced processing ("dropping out") occur (Tinklenberger et al, 1970;Clark et al, 1970). Consequently, performance on both single and divided attention tasks suffer (Moskowitz et al, 1972).…”

Section: Results and Commensmentioning

confidence: 99%