Cognitive psychology and the Jungian mental processes, Pt. I: Ni/Si (“introverted intuition”/”introverted sensing”) and long-term memory

[Addressed to the INTJforum ‘MBTI and Personality Theories’ sub-forum]:


Easily the most prevalent complaint about the so-called Jungian or ‘cognitive’ functions is that they lack too much empirical support to warrant the frequently charitable assumptions made in discussions surrounding them. Many of the frustrations of people who remain skeptical of the functions thesis can be captured by the fact that, at least at present, the functions do not (easily) lend themselves or stand up to scientific scrutiny or testing (or funding).

The idea behind this post (and possibly future ones like it) represents a desire on my part to hopefully mitigate some of the above-named concerns, by highlighting just a few of the real connections between our accepted understandings in cognitive psychology, and how we (viz. casual and expert commentators, and typologists like Berens and Nardi) generally conceptualize the functions. As this can be approached in a number of ways, for the purpose of not rambling myself to death at one time, I will narrow the scope of this post to Ni, Si, (as much about them as we think we might know, in this preliminary stage) and how modern-day cognitive scientists understand memory.

Chapter 1:

The Jungian functions

It is commonly considered that Si has a memory component to it. Indeed, Dario Nardi’s own observations on the subject seem to validate this when he notes that:

“Si types may get ‘in the zone’ when reviewing past events…ISTJ and ISFJ easily enter an expert flow state while recalling, particularly if they close their eyes and take the time to immerse themselves in the memory, reliving it in rich detail” (Neuroscience of Personality, p. 94).


“[Si types] have a propensity for rote memorization, repetition, and in-depth reviews of daily events…Si types are highly capable at recalling information that has little or no context, such as lists of random words…” (NoP, p. 94)

But what most seem to leave out in their examination of Si is that, like Ni, it is predictive and allows users of it to “consider the future” (NoP, p. 95). Nardi notes that both Si and Ni types show moderate-high activity in a brain region that helps us do this, especially insofar as it is helping us plan our own actions ahead of time.

Conversely from Si, Ni is most commonly thought of as the ‘predictive’ function, or the one that most often and accurately allows us to predict what will occur in the future. Though Ni’s power to do this is clearly exaggerated in the mainstream typology culture, I will not attempt to dispel this misconception at the present time. Suffice it instead to point out what Nardi observes about Ni types, who “may easily show a zen state [overall brain pattern] when tasked to envision the future” (NoP, p. 102). And whether you want to call them Ni or NJ types, it is common for these types to self-report in confirmation of this observation made by Nardi in his MBTI-EEG studies.

But Nardi doesn’t mention how Ni looks back in time, or even how Si looks ahead. Probably our forum’s leading proponent of the functions model, whom we all know (to varying degrees of reverence) as […], stated it thusly:

“Ni can deduce the past from the present, and predict the future from the present, in terms of dynamics. Si instead sees things as mostly constant, and tends to be surprised by change. Both Si and Ni are predictive, but Ni types tend to impress others in terms of predicting things that were not ‘obvious’. (I.e., it’s obvious that if this is a rock, then it was a rock, and it will be a rock in the future; it’s not obvious that this is/was a meteorite that fell from the sky, and contains metals/isotopes that aren’t commonly found on Earth.)

And while his example regarding the rock, there, might receive mixed responses from the subforum community, the important point to focus on is that both Ni and Si are predictive and backward-looking functions, though they differ greatly in how they go about fulfilling those purposes.

Now, for those of you who have had enough Nardian ‘pseudoscience’ for one post, you can rest assured that from this point, we will be moving on to ‘actual’ cognitive psychology (though we will still be establishing its relations with Ni and Si in their primitive, abstract forms).

Chapter 2:

Mainstream cognitive psychology

In going forward, readers might find it helpful to keep this handy reference chart in view–but they should note that for the purposes of this post, we will be restricting our scope specifically to declarative (or “explicit”) memory:

(For more on long-term memory’s sub-systems, see here:

The important things to keep in mind (or commit to memory, as it were!) are that:

  • Explicit memory includes all memories that we consciously seek to store and retrieve. These memories are also called declarative memories because they include events that we have deliberately learned, such as ‘I enjoyed playing poohsticks in Sussex’ or facts, such as ‘they grow coffee in Brazil’, and can be described or ‘declared’ to others (Milner, 1965). Explicit/declarative memory is further divided into semantic and episodic memory” (Revlin, Cognition: Theory and Practice p. 152-3).
  • Episodic memory stores and connects the specific times, places, and events in an individual’s life…our episode memory gives rise to the conscious experience of recollection (Tulving, 1982, 1985; Wheeler, Stuss, & Tulving, 1995, 1997)…[and] allows us to travel back mentally in time to earlier moments in our lives not only to retrieve a fact, but in many cases, to relive the experience [retrospective memory]…episodic memory also allows us to travel forward mentally in time in order to remember to do things in the future [prospective memory]” (Revlin, C:T&P p. 153).
  • Semantic memory retains conceptual knowledge stored as an independent knowledge base. It is the library where discrete facts like ‘dogs bark’ and ‘robins are birds’ are stored. Your memories of where you were when you first learned such facts, however, are considered part of episodic memory” (Revlin, C:T&P p. 153).

“As a result of implicit memory‘s functioning, we are able to learn without being aware that we are doing so (e.g., Graf & Schacter 1985), and we can retrieve or use that information without being aware that we have stored it in memory” (Revlin, C:T&P p. 153).

I believe that understanding the two types of declarative/explicit memory presented is key to understanding the memory components of Ni and Si. (For those interested in why I don’t consider implicit memory relevant to the present discussion, see the paragraph below and feel free to comment on its contents.)

[[[I don’t believe implicit memory is particularly important to understand, here, since it functions “semiautonomously”, meaning that its mental functions operate automatically and “in the background”. Treatments of the Jungian functions as unconscious processes are more apt to describe how each type’s tertiary and inferior functions work (in generally inopportune ways), whereas the dominant and auxiliary functions are those that we are conscious of (though it is true that we tend to take the dominant’s operation for granted, as it’s essentially the ‘water we swim in’ and we’re too used to it to take much ‘conscious’ notice). Further, the EEG technology which Nardi utilized only measured neocortical brain activity, meaning it could only be used to analyze the topmost (and newest) layer. As this layer corresponds most closely with conscious and observable thought processes, implicit memory’s mechanics are a little trickier to uncover without more sophisticated brain-imaging technology.]]]

Based on the quotes whose respective authors I’ve cited, the connections between Ni/Si and explicit memory should become clearer. Si thrives on reviewing past events in rich detail, which correlates strongly with our understanding of episodic memory. Both Ni and Si engage in prospective memory, and at least Si engages in retrospective memory (“reliving [past experiences] in rich detail”, as Nardi observed). Finally, Si certainly utilizes semantic memory, which serves as a “library where discrete facts are stored”.

The above seems to leave Ni a bit in the dark, however. Specifically, two questions are left unanswered: 1) Assuming it can equally well engage in retrospective memory, how does it do so in a manner distinct from Si?; and 2) Given that Ni is far more apt to store relations and abstract principles than “discrete facts”, what is Ni’s relation to semantic memory? Might it be that there is some other memory bank which has been either unexplored in cognitive psychology, or left out of the present discussion? For now, I will leave these questions to readers to examine, though I will do so myself in a (hopefully, though not necessarily) timely manner.

In closing

My point here hasn’t been to ‘prove’ or ‘disprove’ the functions. Rather, I went forward with the assumption that the functions are worthy of further refinement and scrutiny, and in this early stage of their treatment the best we can do is ensure that they be defined in terms as technically precise as possible. If this can be done, then perhaps the functions can someday be studied in a more rigorous and scientifically-respectable manner–and there are, for purposes of better understanding ourselves and others, very compelling reasons for the rich variety in cognitive modes across humans to be elucidated and properly accounted for.


3 thoughts on “Cognitive psychology and the Jungian mental processes, Pt. I: Ni/Si (“introverted intuition”/”introverted sensing”) and long-term memory

  1. surajsood Post author

    * I’d like to make one relatively significant revision to the original post, which stated that implicit memory and Si/Ni aren’t really related. Both Ni and Si can develop procedural memory for certain tasks and skills–with the caveat that, while the former hates progressing toward expertise via repetition and practice, the latter thrives on it–and if that’s all that makes up implicit memory (I’ve not come across discussion of any other sub-systems of it, strangely), then of course both Ni and Si can lead to one’s building of implicit memory.


  2. Greg

    I think you’re too quick to dismiss the importance of implicit memory and unconscious processes in general. Even if it’s true that unconscious processes are inaccessible to EEG recording (which is debatable) it doesn’t follow that unconscious processes are therefore unimportant. Just because we *can’t* probe them and understand how they work doesn’t mean we don’t need to.

    If I remember correctly, Nardi points out that INTJ participants in his studies were more likely to enter a state of flow not only when contemplating the future, but when solving novel problems. The state of flow was represented in the EEG data as medium-strength neural activity spread out evenly across the cortex – i.e. many processes happening simultaneously and independently.

    It seems unlikely that an INTJ in this state would have conscious access to and control over all these processes at the same time. Yet this brain state is clearly reflecting the primary function at work (i.e. Ni).

    Also, minor correction: Revlin’s text is ‘Cognition: Theory and Practice’ – not ‘Cognition and Practice.’


    1. surajsood Post author

      Hey Greg,

      Thanks for the comment. (You are the Greg I’m thinking you are, yes?)

      As I mentioned in my follow-up comment, implicit memory definitely is related to both Ni and Si. If my post came off as dismissive of (the merit to studying) unconscious processes, I didn’t at all mean for that–it’s just that while writing, I simply didn’t see much regarding implicit (or procedural) memory and Ni/Si that was worth tying into the piece’s direction. I am still thinking on how best for unconscious processes to be measured directly–as it is important that we eventually find a way to do so–but so far I’ve come up with nothing. Either way, I think that (independent of any potential technological limitations) we still need to substantially improve our philosophy of the unconscious before being able to treat it scientifically.

      You are right about Nardi also speaking to the INJ participants entering flow-states when solving novel problems, and I only thought to include that fact after publishing. How I thought of the flow-state observed in Ni types is that it was being considered as one overall process (Ni), with all of the brain’s regions working synchronously and at low amplitudes. Now, that doesn’t mean there aren’t distinct micro-processes occurring in each brain region involved–obviously, there are–but I’m unsure of how much more precisely Nardi could have examined those, especially given the relatively low precision of EEG compared with other brain-imaging technologies like fMRI.

      Thanks for the correction on Revlin’s text, there, as well.



Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s