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Suppose I am talking to someone and while talking more thoughts come to my mind that I wish to talk about. I postpone those thoughts, however, to tell everything synchronously, i.e., I wish to tell the old thoughts first and then the new thoughts in sequence. But by the time I finish telling previous thoughts and try to come to those new thoughts that I postponed to tell, some are vanished. This must be a very common phenomenon, as everyone has experienced the dreaded

What on earth was I about to say...?

What is the term for this mental state, or of the process mentioned?

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  • $\begingroup$ I've edited the question in an attempt to generalize it into a topic applicable to the general population. $\endgroup$ – AliceD Jun 13 '16 at 19:49
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    $\begingroup$ Yes I noticed, you have made the situation's description more accurate. Thank you for that. $\endgroup$ – Osama Mohammed Shaikh Jun 13 '16 at 19:51
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    $\begingroup$ Working memory in the process though. But I would suppose also that the issue of interference should not be looked down upon here. $\endgroup$ – Inspiresavvy Jun 16 '16 at 16:47
  • $\begingroup$ It's simpy call it "absentmindedness". We're all susceptible to such things and it doesn't neccessarily mean there's anything wrong with our mental processes. $\endgroup$ – VinceCurto Jun 16 '16 at 18:47
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Short answer
The key term in your question is working memory.

Background
Working memory is involved in information-processing functions such as encoding, storing, and retrieving data and it is a system that temporarily stored and manages information required to carry out cognitive tasks, such as learning, reasoning, and comprehension.

One relatively straightforward test to assess working memory is memory span. In this test the number of items (usually words or numbers) is determined that a person can hold onto and recall. In a typical test of memory span, an examiner reads a list of random numbers aloud at about the rate of one number per second. At the end of a sequence, the person being tested is asked to recall the items in order. The average memory span for normal adults is 7 items (source: Medicine Net).

Note that the definition of working memory, as opposed to short-term memory and, to a lesser extent, long-term memory are not that well defined. In fact, Medicine Net links two identical webpages to short-term memory and working memory. The difference between working memory and short-term memory is indeed subtle. Working memory is generally thought to rely on short-term memory, but to additionally involve processes to effectively use those memories during cognitive tasks. The difference may be explained as (Cowen, 2008):

[W]orking memory includes short-term memory and other processing mechanisms that help to make use of short-term memory.

The difference between short- and long-term memory stores is based on a difference in their duration and in their capacity (Cowen, 2008). Long-term memory, not surprisingly, is of longer duration and it can hold much more information. However, it cannot be accessed as readily compared to short-term and working memory.

Reference
- Cowen, Prog Brain Res (2008); 169: 323–38

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  • $\begingroup$ So in above dreaded and embarassing situation, short term memory is the one which is not functioning as expected? $\endgroup$ – Osama Mohammed Shaikh Jun 13 '16 at 19:38
  • $\begingroup$ @OsamaMohammedShaikh - I would say working memory, as you are trying not only to remember your topics, but also wish to express them (i.e., use them) in an ongoing conversation. $\endgroup$ – AliceD Jun 13 '16 at 19:47

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