While not specifically referring to socionics' , the following does shed light on Introverted Sensing as described by Jung:

Introverted Sensing
The introverted sensing type is primarily concerned with the concrete environment beside him. However, unlike the Extroverted Sensor he does not assume the identity of the object to exist in its own right, he interpolates his own perceptions between his inner life and the external object. In other words, he derives his ideas of what pens and desks look like not based directly on what he has seen, but based on the notes his unconscious mind has taken of the perceived objects. Thus a subjective perception is interpolated between the object itself and the mind of the introverted sensor. This is indeed a very peculiar psychological set up. As sensation is concrete by definition as well as oriented strictly by the external entities, yet is admixed with a flavor of introversion. The question to ask is, does Introversion detract from sensation or does it contribute to this faculty. The most intuitive answer seems to be that it detracts from sensation, or makes sensation less productive. This appears to be the case because sensation is primarily externally oriented and introversion, obviously, internally oriented. However, it should be noted that even the most externally focused faculties are indirectly fueled by the inner life or the mind. The extrovert is internally inspired to be externally oriented. In the same respect Introverted Sensation focuses on what is to be sensed, as the extroverted faculties focus on entities that one can interact with outside of his inner life. Thus the Introverted Sensation is the most intense form of sensation or most focused on the concrete and therefore most attuned with the senses. This is the case as it has been shown in many places in this book that introversion intensifies all faculties. As has been stated in the description of Introverted Intuition, perceptions are favored or disfavored not by their ostensible and objective merits or demerits, but by how they relate to the mind of the Introverted Perceiver in question. Some perceptions are attractive because they set of an inner trigger within the unconscious of the introverted sensor and some are repelled because there is little within the mind of the introverted sensor to attract such entities. Even though such a mindset brings about a keen awareness of the external physical environment, it is deeply puzzling why the judgment of this type appears aloof and arbitrary. Once more, as for every introvert, the introverted sensor orients primarily by what is to be found in this inner life than what is outside of himself. “The predominance of introverted sensation produces a definite type, which is characterized by certain peculiarities. It is an irrational type, because it is oriented amid the flux of events not by rational judgment but simply by what happens. Whereas the extraverted sensation type is guided by the intensity of subjective sensation excited by the objective influences, the introverted type is guided by the intensity of the subjective sensation excited by the objective stimulus. What will make an impression and what will not can never be seen in advance, and from outside. “ Psychological types. P. 295
The primary difference between the Introverted and the Extroverted Sensor is that in the case of the latter it may be easily figured out why the type is attracted to particular sensations as they all could be observed with unaided eye. All that is necessary to do is simply an observation of concrete, external objects which require little more than our five senses. Yet the taste in perceptions of the Introverted Sensor remain enigmatic. As mentioned in Chapter one, Introverts, especially Introverted Sensors tend to have a nostalgia for the past due to their inability to properly interact with the external environment. Fluent interaction with the external environment requires Extroverted perception most of all, and proper cognitive assessment of the external environment requires Extroverted Intuition which often appears to be wanting in the Introverted Sensing type as the Extroverted Intuition is the inferior faculty.
Because this type focused on impressions of what has been observed, as an obvious property of sensation, it is rendered even more easy to recollect than produce what is original. This makes the Introverted Sensor’s affinity with the past even stronger. His perceptions tend to be focused on what is of interest, just like that of the Introverted Intuitionist. Unlike the Extroverted Sensor, the Introverted Sensor can easily focus only on what most stimulates him, and not all that could be observed with the five senses. When these variables are translated into personalities of Western Culture, it often follows that the Introverted Sensor prefers only one kind of exercising routine, as opposed to experimenting with many, only one or few kinds of meals, and only the few selected sporting activities or activities which require active use of sensation. Perception is also concerned with how one leads his lifestyle, as perception by its nature is concerned with how one leads his lifestyle, as perception by its nature is concerned with the environment around us. For the reasons mentioned above, the Introverted Sensor prefers to have a static lifestyle with few changes, unlike the Extroverted Sensor who tends to enjoy a variety. It should also be noted that such a focus on what is important, in addition to the general focus on the concrete and detail makes it easy for the Introverted Sensor to pay meticulous attention to tasks of importance to him. Especially those that could be easily located in the concrete world of physical occurrences.
In effect, the Introverted Sensor collects perceptions and memories that are of value to him and is forced to cling to them. Anything that disturbs his inner vision is deemed highly undesirable as he tends to see little distinction between the external world as a thing in itself and the external world as perceived by his vision. Seeing the external environment as a thing in itself is a matter of Extroverted Perception, which the Introverted Sensor by and large tends to lack. Adapting to the changes of the External environment requires a high intuitive capacity which orients around the External world, this is too to be associated with Extroverted Intuition which for the Introverted Sensor is an inferior faculty. For this reason the Introverted Sensor tends to experience immense difficulties when he is forced to adjust to the external environment.
The Introverted Sensor, even though firmly in tune with the concrete, shall have difficulty finding a satisfactory concrete environment in the external world as his perceptions tend to be very rigid in their affinity with the inner life. For him it is the case that what he senses is either in tune with his inner, seemingly arbitrary hunches and impulses or they are not. Since he is lacking Intuition and abstract or Introverted judgment he is not in the position to do the proper assessment, therefore he but compares what he observes with what he deems to be fitting and proper. Such rigidity of thought is most firmly pronounced in military and religious regimes. We recognize that this is even further affinity with the unconscious tendencies of the Introverted Sensing type as religious practices tend to be loyal to one tradition that has been established many centuries ago, and the tradition is almost always faithfully preserved to resemble the vision that has been established originally.
As a dominant sensation type, the Introverted Sensor is clearly in tune with his instincts, because he is the most sensation oriented of all types, his physical sensations are most intense. Usually such types are adept to participate in almost all physical activities that shall serve their interests. Since this type’s sensations tend to run in intensity and not extensity, as well as are more influenced by the past than the present, this type is most influenced by the occurrences that has happened in childhood, or occurrences that have happened before the type has attained a firm outlook on life. They serve as foundational to all experiences he will encounter in the future as Introverted Perception naturally imposes what has previously been collected onto what is to be embarked on next. Unlike the Extroverted Sensor who deems the external environment as an end in itself and is experiential, therefore can easily overcome the influences of the past, the Introverted Sensor cannot divorce himself from his perceptions. After those foundational entities have been established, they tend to haunt the thought of this type to the very end, often in mystical ways that he himself is not aware of. Unconsciously, as a result his perceptions concoct a vision of the world that combines all that he has observed in the past and is currently observing, though clearly with a more intense focus on the past than on the present moment. This is the case because the Introverted Sensor is in closer affinity with his inner perceptions than with the immediate external observations.
As a concluding remark on the nature of Introverted Sensation, I shall remind the reader that introversion tends to deem one’s own judgment favorable and what has not been judged to be pernicious. This is the typical preference for the subject over the object. Since it is the sensation that is subject oriented, whatever has not yet been sensed is to be deemed a threat. For this reason, the Introverted Sensor tends to be highly risk averse and on a look out for potential dangers, even those coming from the simplest concrete objects. For this reason, among many others, novelty and whatever may disturb the current modus operandi is decried with extreme prejudice. Even minor changes in the physical environment often lead to great upsets, such as the change of temperature in the room or the change in content of daily meals. As typical of an introverted function, a very high standard is propounded to assess the external environment which obviously must be in the heavens, as nothing of the like is to be found on earth! Since the introverted perception in this case is primarily oriented by sensation, the focus is placed on creating the most sensually congenial physical environment. The behavior of a fictional detective Adrianne Monk represents this phenomenon. An exaggeration of this tendency is most expressed in the obsessive compulsive personality disorder.