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  On Being Stoned

    Charles T. Tart, Ph. D.

        Chapter 14.    Cognitive Processes: Memory



    EFFICIENT AND ACCURATE access to memories is central to adaptive human action, both in terms of keeping track of the nature of immediate situations (intermediate-and short-term memory) and in keeping immediate action congruent with long-term values and knowledge (long-term memory).[1] With marijuana intoxication, the user perceives a variety of alterations in memory functions—enhancements, decrements, and falsifications.

 

MAJOR EFFECTS

Long-Term Memory

    "My memory for otherwise forgotten events is much better than when straight when I consciously try to remember" is a fairly frequent effect (22%, 24%, 29%, 15%, 5%), which begins to occur at Moderate to Strong levels of intoxication (6%, 25%, 29%, 9%, 1%). The converse effect, "My memory for otherwise forgotten events is much worse than when straight when I try to remember" is an infrequent effect (27%, 28%, 22%, 11%, 7%), which also occurs at Moderate to Strong levels (4%, 19%, 21%, 17%, 5%). The College-educated experience this worsening more frequently than the Professionals (p <.05). The young experience worse memory primarily at Fairly and Very Strong levels, whereas the older users experience it primarily at the Strong level (p <.05).
Figure 14-1.
INTOXICATION EFFECTS ON LONG-TERM MEMORY
Note.—For guide to interpreting the "How Stoned" graph,
see note on Figure 6-1.

    Aside from consciously trying to recall things, a common effect is "I spontaneously remember things I hadn't thought of in years, more so than straight (does not apply to consciously trying to remember things)" (13%, 24%, 37%, 17%, 7%). This is more frequent among the young users (p <.05). It begins to occur at the Strong levels (6%, 18%, 37%, 17%, 3%).
    The relationships of these three aspects of long-term memory are shown in Figure 14-1. Spontaneously remembering the past occurs more frequently (p <.01) than recall becoming poorer, and recall becoming poorer occurs at higher levels of intoxication than recall becoming better (p <.05).
    Comments from my informants suggest that the nature of poor recall is one of selection; many memories are available, but they are often the wrong ones, not those the user wants.

 

Intermediate-and Short-Term Memory

    A very characteristic effect of marijuana intoxication is "My memory span for conversations is somewhat shortened, so that I may forget what the conversation is about even before it has ended (even though I may be able to recall it if I make a special effort)" (3%, 7%, 29%, 49%, 11%). It begins to occur at Strong and Very Strong levels (4%, 15%, 39%, 30%, 8%). Heavy Total users need to be more intoxicated to forget the start of the conversation (p <.05).
    Going from intermediate-to short-term memory, a common effect is "My memory span for conversations is very shortened, so that I may forget what the start of a sentence was about even before the sentence is finished (although I may be able to recall it if I make a special effort)" (8%, 24%, 31%, 31%, 5%). This drastic shortening of memory span begins to occur at the Strong and Very Strong levels (3%, 9%, 28%, 29%, 22%), with males needing to be more intoxicated than females to experience this (p <.05).
    In spite of this drastic shortening of immediate memory, it is also a common effect that "I can continue to carry on an intelligent conversation even when my memory span is so short that I forget the beginnings of what I started to say; e.g., I may logically complete a sentence even as I realize I've forgotten how it started" (6%, 20%, 43%, 24%, 5%). This effect also begins to occur at the Strong and Very Strong levels (5%, 13%, 33%, 29%, 9%). The college-educated experience this beginning at higher levels than the Professionals (p <.05), and the Weekly users at higher levels than the Daily or Occasional users (p <.05).[2]
Figure 14-2.
INTERMEDIATE-AND SHORT-TERM MEMORY
Note.—For guide to interpreting the "How Stoned" graph,
see note on Figure 6-1.

    The relationships of these three alterations of intermediate- and short-term memory are presented in Figure 14-2. Forgetting the start of the conversation occurs more frequently than forgetting the start of one's sentence (p <.0005) or than being able to converse despite a shorter memory span (p < .0005). Forgetting the start of one's sentence occurs at higher levels than forgetting the start of the conversation (p <.01), and forgetting the start of one's sentence is rated as beginning at somewhat higher levels than being able to converse intelligently despite a shortened memory span (p <.05).[3]
    Two related items dealt with elsewhere also illustrate the shortening of intermediate-and short-term memory. Finding that thoughts slip away before they can quite be grasped (Chapter 15) occurs less frequently than either forgetting the start of the conversation (p <<.0005) or the start of one's sentence (p <.01), and at intoxication levels midway between these two phenomena, albeit not significantly different from either of them. Forgetting to finish a task one has started (Chapter 17) occurs more often than forgetting the start of one's sentence (p <.01), but with about the same frequency as forgetting the start of the conversation. It occurs at lower levels of intoxication than forgetting the start of the conversation (p <.01) and much lower levels than forgetting the start of one's sentence (p <.0005).
    In sum, there is often an increasing shortening of intermediate- and short-term memory span with increasing levels of intoxication, as much as forgetting the start of a sentence one is speaking at Strong and Very Strong levels, but it is commonly felt that this does not necessarily have any effect on the intelligibility of the user's conversation.

 

False Memories

    A mild version of a user's memory playing him false is "I think I've said something when actually I've only thought about saying it, more so than when straight." This is a common effect (18%, 24%, 36%, 19%, 3%), which may occur at the Strong and Very Strong levels (3%, 9%, 26%, 34%, 8%). Users of Psychedelics report it as occurring less often (p <.05) and at higher levels of intoxication (p <.05) than Non-users. Light Total users experience this mistake more frequently (p <.05, overall), and Weekly users need to be more intoxicated to experience this than either Daily or Occasional users (p <.01, overall).
    "I think something is a memory when it turns out to be a fantasy, something I just made up but fooled myself into thinking was a memory at the time (not the same as déjà vu)" is a rare effect (47%, 27%, 20%, 3%, 0%),[4] which may occur at the very high levels of intoxication (3%, 6%, 13%, 17%, 8%). Light Total users need to be more intoxicated for this (p <.05).
    The experience of déjà vu (Chapter 9), a common effect beginning to occur at the Strong levels of intoxication, has already been described; this is another instance of poor operation of the memory process, for either a current situation falsely has the quality of "memory" attached to it, or an actual memory is not being completely labeled as a memory. It seems to feel like a memory without really seeming to be one.
Figure 14-3. FALSIFICATION OF MEMORIES
Note.—For guide to interpreting the "How Stoned" graph,
see note on Figure 6-1.

    The relationships between these three falsifications of memory functioning are shown in Figure 14-3. Believing a fantasy to be a memory occurs much less frequently than thinking one has said something when he has not (p <.0005) or déjà vu. Although déjà vu occurs at somewhat lower levels of intoxication than the other two effects, the differences do not reach statistical significance (p <.10 at the greatest).
    Thus while the "quality" attached to contents of consciousness that identifies them as a memory may be frequently affected by marijuana intoxication, it is seldom that this is affected strongly enough for the user to actually mistake a fantasy for a memory, i.e., he may frequently experience things seeming like memories but he does not necessarily believe it.

Memory for Periods of Intoxication

    If memory functions during the intoxicated state seem to alter, what happens to the memories of the intoxicated state?
    "My memory of what went on while I was stoned is good afterwards, better than if I had been straight all the time" is a common effect (19% 25%, 31%, 14%, 9%), which begins to occur at the Moderate and Strong levels (13%, 24%, 25%, 13%, 1%). It is reported as occurring more frequently by females (p <.05), and by the College-educated (p <.05). The Daily and Weekly users have this improved memory more frequently than the Occasional users (p <.01, overall).
Figure 14-4.
MEMORY FOR PERIODS OF INTOXICATION
Note.—For guide to interpreting the "How Stoned" graph, see note on Figure 6-1.

    The converse, "My memory of what went on while I was stoned is poor afterwards compared to what I would have remembered had I been straight" is also a common effect (18%, 24%, 24%, 16%, 17%), which begins to occur at Strong levels (7%, 14%, 28%, 15%, 13%). It occurs as frequently as improved memory, but at higher levels of intoxication (p <.0005), as shown in Figure 14-4.
    Comments from informants make it clear that a good deal of the poor memory for periods of intoxication is not ordinary forgetting but what has been termed "state-specific memory." The events of the intoxicated state are stored in memory, but they cannot be retrieved in an ordinary state of consciousness. The next time the user becomes intoxicated, however, he can remember many of the things from previous periods of intoxication that he could not remember in his ordinary state.
    Thus the forgetting of periods of intoxication are a combination, in unknown degree, of genuine forgetting (no initial storage and/or no possible way of retrieval) and state-specific storage of memories.
    A specific aspect of memory for periods of intoxication relates to the results of reading during such periods.
    "If I read while stoned, I remember less of what I've read hours later than if I had been straight" is a common effect (15%, 11%, 19%, 14%, 29%), which may begin at Moderate levels of intoxication (13%, 29%, 23%, 5%, 1%). It is experienced less frequently by Meditators and the Therapy and Growth group (p <.05, overall) and more frequently by the younger users (p <.01).
Figure 14-5.
MEMORY OF READ MATERIAL
    The converse effect, "If I read while stoned, I remember more of what I've read hours later than if I had been straight" is infrequent (41%, 25%, 16%, 6%, 3%) and, when it occurs, begins at the Low and Moderate levels (15%, 18%, 10%, 3%, 1%). It occurs less frequently among the Light Total users (p <.001), the Occasional users (p <.05), and the Non-users of Psychedelics (p <.05). The Therapy and Growth group experience increased memory for read material more often (p <.05, overall).
    Figure 14-5 shows that decreased memory occurs much more frequently than increased memory (p <<.0005). The levels of intoxication do not differ significantly.

 

ADDITIONAL EFFECTS

    "I remember the most obvious things and laugh to think I could have forgotten them" (Rarely, Strongly).
    "Relive childhood experiences" (Usually, Fairly).

 

LEVELS OF INTOXICATION FOR MEMORY PHENOMENA

    The overall relation of various phenomena to levels of intoxication is shown in Figure 14-6. The overall ordering is highly significant (p < <.0005).

FIGURE 14-6.
INTOXICATION LEVELS, MEMORY PHENOMENA
Just        Fairly    Strongly    Very
Strongly
Maximum

Type size code:
CHARACTERISTIC
COMMON
INFREQUENT
Rare
FORGET START OF SENTENCE
THOUGHTS SLIP AWAY BEFORE GRASPED
THINK SAID SOMETHING WHEN HAVEN'T
CONVERSE INTELLIGENTLY DESPITE SHORTENING
    OF MEMORY SPAN
FORGET START OF CONVERSATION
POOR MEMORY FOR PERIODS OF INTOXICATION
Déjà Vu
SPONTANEOUSLY RECALL THINGS LONG FORGOTTEN
OFTEN FORGET TO FINISH SOME TASK
EASILY SIDETRACKED
WORSE LONG-TERM MEMORY
BETTER LONG-TERM MEMORY
GOOD MEMORY FOR PERIODS OF INTOXICATION
REMEMBEER LESS OF WHAT IS READ
REMEMBER MORE OF WHAT IS READ *

Just        Fairly    Strongly  Very
Strongly
Maximum
*There is some question whether this effect is available at all levels above the minimal one.

 
    At the lowest level, memory for material read is infrequently improved, but it commonly begins getting worse by the Fair level of intoxication. Moving up toward Strongly intoxicated, memory for periods of intoxication is good, but long-term memory may become better or worse, depending on (currently unknown) psychological variables. Memory becomes somewhat erratic and impaired from the Strong level up; while very old memories may spontaneously return, the user may easily get distracted and forget what he set out to do. Moving toward Very Strongly, intermediate-term memory begins to shorten, so that the start of one's conversation may be forgotten before it is finished (although this is generally not felt to impair conversation significantly), and the user may eventually find himself forgetting the beginnings of his sentences. Most of these memory tricks and shortenings are quite apparent to the user, and many users exert effort to compensate for them. At the Very Strong level the user may (rarely) not be aware of the tricks of his memory functioning and temporarily mistake fantasies for actual memories.

 

MODULATING FACTORS

    The effects of relatively linear background factors are summarized in Table 14-1.
    Users with more drug experience seem less prone to tricks of memory, experiencing several of them less frequently and at higher levels of intoxication. The older users show a similar trend.
    Several effects of background factors were not linear. The younger users were more variable on level of intoxication for worsened long-term memory. The Weekly users can be more intoxicated and still converse intelligently despite memory problems than can the Occasional or Daily users, as well as needing to be more intoxicated to think they've said something when they've only thought about it.

TABLE 14-1
EFFECTS OF BACKGROUND FACTORS ON MEMORY PHENOMENA
BACKGROUND FACTORSEFFECTS
More Drug ExperienceMore frequent:
    Recall more of material read
    Good memory for periods of
      intoxication
    Easily sidetracked
 
More intoxicated for:
    Forget start of conversation
    Think said something when haven't
Less frequent:
    Thoughts slip away
    Think said something when haven't
 
 
 
Less intoxicated for:
    Mistake fantasy for memory
 
Older  Less frequent:
    Easily sidetracked
    Spontaneously remember
      long-past events
    Recall less of material read
More Educated  Less frequent:
    Easily sidetracked
    Worse long-term memory
    Good memory for periods of
      intoxication
 
Less intoxicated for:
    Easily sidetracked
    Converse intelligently despite
      forgetting
Males
 
 
More intoxicated for:
    Forget start of sentence
Less frequent:
    Good memory for periods of
      intoxication
 
 
Meditation  Less frequent:
    Recall less of material read
Therapy & GrowthMore frequent:
    Recall more of material read
Less frequent:
    Recall less of material read

 

Summary

    While very low levels of intoxication may not affect or even may slightly potentiate memory, in the Moderate and higher levels of intoxication there are strong alterations of memory functioning. There is an increasing shortening of memory span, up to the point where a user may forget the start of a sentence he is speaking. Users are generally aware of this span shortening and try to compensate for it in various ways—apparently successfully, as it is a common experience for users to feel they can converse intelligently in spite of this shortening of memory span. State-specific memory is also experienced, i.e., happenings of one intoxication period, which were unrecallable in the subsequent ordinary state of consciousness, are recallable the next time the user again becomes intoxicated.

 

Footnotes

    1. The terms long-, intermediate-, and short-term memory are not used in an exact technical sense in this chapter, but more generally to indicate memory span over years or days, minutes, and seconds. (back)
    2. My informants indicate that this is an objective effect, for many of them have had the experience of talking to a straight person while they were intoxicated, forgetting the start of many of their sentences, but having no indication from the straight person that their speech was noticeably impaired. Whether this says something about the intoxicated state or the intelligence required to carry on normal conversation is an interesting question. (back)
    3. Being able to converse intelligently even though the beginnings of one's sentence may be forgotten, should, strictly speaking, occur at the same levels of intoxication as forgetting the start of one's sentence. This was not exactly so in the last difference mentioned above, probably because the slight ambiguity in the wording of the first question allowed it to include somewhat less drastic shortenings of memory span. (back)
    4. The rounding-off process lets the figures in Never and Rarely add up to only 74 percent here, but the originals round off to 75 percent, thus the "rare" classification. (back)

Chapter 15


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