Jungs description of judgement and perception varies from the mbti equivalent. So don't try to compare the two as it will only lead to confusion.
While mbti uses the same terminology as jung, their definitions are very different.
Jung seperates his types into "
general attitude types" and "function-types". Under "general attitude types" there is "extraverted" attitude and the "introverted" attitude, amongst the "function-types" which he also terms the "most differentiated functions", he identified the following types "sensation, intuition, feeling and thinking".
He categorised sensation and intuition as irrational\unconcious\perception functions, and feeling and thinking as rational\concious\judgement functions, because feeling and thinking serve a a faculty for judgement while sensation and intuition are for observationan and synthesis.
His types are:
extraverted type
=>extraverted rational types-> (extraverted thinking type & extraverted feeling type)
=>extraverted irrational types-> (extraverted sensation type & Extraverted Intuitive Type)
introverted types
=>introverted rational types-> (introverted thinking type & introverted feeling type)
=>introverted irrational types-> (introverted sensation type & introverted Intuitive Type)
I have extracted sections from Jungs work on psychological types where he describes & distinguishes his ideas of perception and judgment.
[the sections in quotes are the excerpts from Jungs Psychological types, you can find the full text of chap 10 of his book here
http://psychclassics.asu.edu/Jung/types.htm .You can find a lexicon of his terms here
http://www.psychceu.com/Jung/sharplexicon.html , you will probably find better ones if you dig around. (another one
http://www.nyaap.org/index.php/id/7 and another
http://www.cgjungpage.org/index.php?option=com_content&task=view&id=869&Itemid=41)
"...Speaking generally a judging observer will tend to seize the conscious character, while a perceptive observer will be influenced more by the unconscious character, since judgement is chiefly interested in the conscious motivation of the psychic process, while perception tends to register the mere happening."
I think this is pretty self explanatory.
Summary: judgement is a concious process while perception tends to be an unconcious process, judgement wantst to structure and systemise\ conceptualise, while perception is happy merely registering the happenings the perciver observes. Perception is satisfied with mere apprehension while judgement seeks conclusiveness.
(the section below is in reference to rational types)
"...The reasonableness that characterizes the conscious management of life in both these(extr. thinking & extr. feeling) types, involves a conscious exclusion of the accidental and non-rational. Reasoning judgment, in such a psychology, represents a power that coerces the untidy and accidental things of life into definite forms; such at least is its aim. Thus, on the one hand, a definite choice is made among the possibilities of life, since only the rational choice is consciously accepted; but, on the other hand, the independence and influence of those psychic functions which perceive life's happenings are essentially restricted. This limitation of sensation and intuition is, of course, not absolute. These functions exist, for they are universal; but their products are subject to the choice of the reasoning judgment. It is not the absolute strength of sensation, for instance, which turns the scales in the motivation of action, but judgment, Thus, in a certain sense, the perceiving-functions share the same fate as feeling in the case of the first type, or thinking in that of the second. They are relatively repressed, and therefore in an inferior state of differentiation. This circumstance gives a particular stamp to the unconscious [p. 455] of both our types; what such men do consciously and intentionally accords with reason (their reason of course), but what happens to them corresponds either with infantile, primitive sensations, or with similarly archaic intuitions."
Summary: a dominant emphasis on judgement (concious function) restricts perception (unconcious function) and vice versa. A high degree of preference of the one (judgement\perception) has an inhibitory effect on the other, and the inhibited function tends to be less developed. So here Jung is saying that a high degree of preference for concious judgement over perception will correspond to a infantile\primitive perception function(intuition, sensation). To the extent that the one is preferred the other is repressed.
"In reference to extraverted irrational types (Extr. intuition & sensing)
...I call the two preceding types irrational for reasons already referred to; namely, because their commissions and omissions are based not upon reasoned judgment but upon the absolute intensity of perception. Their perception is concerned with simple happenings, where no selection has been exercised by the judgment. The objective occurrence is both law-determined and accidental. In so far as it is law-determined, it is accessible to reason; in so far as it is accidental, it is not. One might reverse it and say that we apply the term law-determined to the occurrence appearing so to our reason, and where its regularity escapes us we call it accidental. The postulate of a universal lawfulness remains a postulate of reason only; in no sense is it a postulate of our functions of perception. Since these are in no way grounded upon the principle of reason and its postulates, they are, of their very nature, irrational. Hence my term 'irrational' corresponds with the nature of the perception-types. But merely because they subordinate judgment to perception, it would be quite incorrect to regard these types as unreasonable. They are merely in a high degree empirical; they are grounded exclusively upon experience, so exclusively, in fact, that as a rule, their judgment cannot keep pace with their experience. But the functions of judgment are none the less present, although they eke out a largely unconscious existence."
summary: Perception registers both law-determined and accidental occurrnces. Perception types subordinate judgement to perception and vice versa.
"...This rational presentation is exclusively valid for the rational types; it by no means applies to the irrational, whose rapport is based not at all upon judgment but upon the parallelism of actual living events."
"...The remarkable indifference of the extraverted intuitive in respect to outer objects is shared by the introverted intuitive in relation to the inner objects. Just as the extraverted intuitive is continually scenting out new [p. 507] possibilities, which he pursues with an equal unconcern both for his own welfare and for that of others, pressing on quite heedless of human considerations, tearing down what has only just been established in his everlasting search for change, so the introverted intuitive moves from image to image, chasing after every possibility in the teeming womb of the unconscious, without establishing any connection between the phenomenon and himself."
...
"...Introverted intuition apprehends the images which arise from the a priori, i.e. the inherited foundations of the unconscious mind. These archetypes, whose innermost nature is inaccessible to experience,"
he lost me here, this sounds very similar to Kants idea of a "thing-in-itself" and shopenhauers "will and representation"
http://en.wikipedia.org/wiki/Thing-in-itself
http://en.wikipedia.org/wiki/Transcendental_idealism
http://en.wikipedia.org/wiki/The_Wo...sentation#Epistemology_.28Vol._1.2C_Book_1.29
...
"5. Recapitulation of Introverted Rational Types (Intr. Feeling & Intr. Thikinking)
...Both the foregoing types are rational, since they are founded upon reasoning, judging functions. Reasoning [p. 496] judgment is based not merely upon objective, but also upon subjective, data."
...
refering to the introverted intuitive:
"As a rule, the intuitive stops at perception; perception is his principal problem..."