In 1986, Parr and Krashen published the results of two studies testing Krashen’s Din Hypothesis. The first study tested the prediction that the Din is a widespread phenomenon. The data obtained from 150 high school students of Spanish and 216 college students of Spanish confirmed the prediction: 78% of the high school students and 69% of the college students answered affirmatively the question “Have you experienced the ‘Din in the Head’?” after reading Barber’s (1980) description of the phenomenon. The second study, however, supported the claim that advanced
performers do not experience involuntary rehearsal. In this study, the data came from a group of 28 “advanced graduate students and faculty in foreign language education who had acquired their second language as adults” (p. 276). Only 10% percent (3 subjects) of these speakers answered Yes to whether they had experienced the Din. There are a few problems with these data, however. Although the authors claim these were “advanced performers of the second language” (p. 276), the proficiency level of the participants in either study was not measured in any systematic way. Moreover, the
“advanced performers” were interviewed orally rather than surveyed through a questionnaire, as was done in the first study. Krashen explained the discrepancy between these results and Bedford’s (1985) and Guerrero’s (1987) saying that maybe the subjects in his study “were even more advanced, professors and teachers of the
language” (personal communication, March 14, 1988).
In summation, studies on the Din suggest that it is a common and widespread occurrence among L2 and FL learners, both children and adults, and that it can arise spontaneously or be triggered deliberately by the learner. Sounds, words, phrases, and sentences of the L2 may suddenly pop out and ring insistently in the student’s head, or may be deliberately retrieved, repeated, and analyzed. Though Krashen predicted that the Din would occur as a result of comprehensible input, the Din has also been documented as an internal mechanism to cope with language that is not fully understood. There are reports of learners experiencing the Din after listening, talking, or even reading in the L2. On the question of whether the Din disappears with proficiency, there is contradictory evidence. This may possibly be an effect of the methodology used in the various studies testing the Din. A close scrutiny of the sampling procedures reveals great differences in the surveyed populations and in the way linguistic ability was determined. These variations render comparison among proficiency levels problematic. The study by Guerrero (1999) described below aimed at clarifying these discrepancies and elucidating the question of whether mental
rehearsal of the L2 wanes or disappears with proficiency.
Mental Rehearsal and Inner Speech Development
The role of mental rehearsal in the development of inner speech in the L2 was explicitly pursued in a wide-ranging investigation conducted by Guerrero (1990/1991, 1994,1999). In two separate studies based on questionnaires and interviews, Guerrero investigated the nature-in terms of form and functions-of inner speech as it manifested itself during mental rehearsal of the L2. The first study (Guerrero 1990/1991, 1994) focused on learners at three levels of ESL proficiency-low, intermediate, and high. The second study (Guerrero, 1999) replicated the first study with a population of
advanced ESL learners. Both studies were able to confirm the occurrence of L2 inner speech as various forms of rehearsal among the participants. The studies also found a positive correlation between inner speech and proficiency; in other words, as the proficiency level increased, so did the frequency of L2 inner speech. Several phonological, lexical, syntactic, and semantic characteristics of L2 inner speech were identified through these studies as well as various different functions of inner speech. It was found, for example, that, as students were mentally rehearsing in the L2, their
inner speech performed a very important mnemonic role of recalling and fixing words in memory. Their inner speech was also used for instructional, preparatory, and affective purposes, among others. In addition, the studies revealed that, though generally the occurrence of inner speech increased with proficiency, certain specific functions decreased. Very advanced learners, for example, reported engaging in less rehearsal to store words in memory, to imitate pronunciation, and to prepare for future production than lower proficiency learners.44 The results suggest, however, that L2 inner speech can function, in advanced levels of proficiency, as a powerful and efficient tool for thought. On the other hand, the studies also suggest that at low levels of L2 proficiency, mental rehearsal, rather than representing the activation of fully fledged L2 inner speech, is a mechanism operating towards L2 internalization and the development of L2 inner speech.
Taken From:Inner Speech – L2 hinking words in a second langunge