|Australasian Journal of Educational Technology
2011, 27(4), 693-708.
Presentation time concerning system-paced multimedia instructions and the superiority of learner pacing
Klaus D. Stiller, Kirstin Petzold and Peter Zinnbauer
University of Regensburg
The superiority of learner-paced over system-paced instructions was demonstrated in multiple experiments. In these experiments, the system-paced presentations were highly speeded, causing cognitive overload, while the learner-paced instructions allowed adjustments of the presentational flow to the learner's needs by pacing facilities, mostly leading to higher learning success. A research gap exists in investigating how effects depend on the speed of system-paced presentations. Hence, in this follow-up experiment to Stiller, Freitag, Zinnbauer and Freitag (2009), 142 university students received four web-based instructions consisting of static pictures and on-screen texts about the structure of the human eye. Three instructions were system-paced with a low, medium, and high speed, and one condition was learner-paced. Students rated their mental effort while learning and performed tests of retention, labelling pictures, verbalising structural knowledge, and transfer. With learner pacing, students reported lower mental effort and were better in labelling pictures and verbalising structural knowledge. Surprisingly, the medium system-paced instruction resulted in the worst performance, which partly questions common explanations of pacing effects.
The empirical base of the self-pacing principle was given by multiple experiments comparing system-paced and learner-paced instructions. An instruction was system-paced when the system determined the duration of information presented. Learner pacing was realised by allowing learners to decide to start a part of the presentation after the preceding part has finished or to choose when a presentation should be paused and played using interactivity facilities (Hasler, Kersten & Sweller, 2007; Mayer & Chandler, 2001; Schwan & Riempp, 2004).
The superiority of learner pacing was observed using various methods: Less mental effort while learning (Hasler et al., 2007; Moreno, 2007; Stiller et al., 2009), less time on acquiring a skill (Schwan & Riempp, 2004), and higher scores on tasks of retention, labelling pictures, transfer, knowledge application and structural knowledge (Hasler et al., 2007; Lusk et al., 2008; Mayer & Chandler, 2001; Moreno, 2007; Stiller et al., 2009; Stiller & Zinnbauer, 2011; Tabbers, 2002). Empirical evidence supporting advantages of learner pacing has been found with short (less than 10 min) and longer lasting (up to 30 min) instructions (Hasler et al., 2007; Mayer & Chandler, 2001; Schwan & Riempp, 2004; Stiller et al., 2009, and Lusk et al., 2008; Moreno, 2007; Stiller & Zinnbauer, 2011; Tabbers, 2002, respectively), using narrated dynamic visualisations, such as animations and videos (Hasler et al., 2007; Mayer & Chandler, 2001; Moreno, 2007; Stiller & Zinnbauer, 2011), dynamic visualisations without text (Schwan & Riempp, 2004), narrated dynamic presentations comprising a mixture of pictures, diagrams and on-screen text (Lusk et al., 2008) or static visualisations with visual, but not auditory text (Tabbers, 2002; Stiller et al., 2009), and with adults and children (Lusk et al., 2008; Mayer & Chandler, 2001; Moreno, 2007; Schwan & Riempp, 2004; Stiller et al., 2009; Stiller & Zinnbauer, 2011; Tabbers, 2002, and Hasler et al., 2007, respectively). The above studies lacked experimental manipulation in a naturalistic setting; they were mostly conducted in laboratories by individually testing participants with narrated dynamic visualisations (Betrancourt, 2005; Mayer, 2005). Only Tabbers (2002) and Stiller et al. (2009, 2011) used online or classroom settings.
Older research about pacing in computer programs showed inconsistent results (Niemiec, Sikorski & Walberg, 1996; Reeves, 1993; Williams, 1996) and thus is not helpful. Two problem areas were identified: A lack of theoretical foundations of the experiments and methodological problems (Lepper, 1985; Reeves, 1993; Williams, 1996). Especially the latter gave rise to essential criticism. Reeves (1993) and Williams (1996) blamed unclear, ambiguous definitions of the implemented types of learner control that render interpretations of results difficult, as well as using inadequate designs, which include poor instrumentation, control of procedures and sampling as well as means of data analysing. As a typical problem, Williams (1996) pointed at the confounding of control type (learner vs. system) with the amount of instruction. Often learners having control over an instruction incompletely study it, while the learners guided by the system simply receive more instruction. This problem frequently leads to a superiority of system-controlled instructions due to providing a more complete lesson.
Learner pacing seems to be especially helpful when it can improve a presentational design in a way that greatly enhances information processing. This is true for dynamic presentations using speech and dynamic visualisations that bring learners to their limits by putting high extraneous load on working memory through a continuous and speedy presentation of information (Hasler et al., 2007; Mayer & Chandler, 2001; Moreno, 2007). Such a presentation forces the learners to perceive and process information within a given, short time period. Learners only have limited time to extract relevant information and to maintain it in working memory until information is organised and integrated before the next presentational part has to be processed. The means of pacing used in the experiments brought two improvements to that kind of instructions: They enabled learners to adjust the information flow to their needs of information processing and segmented the continuous presentation into conceptually meaningful entities that might foster the construction of schemas. Thus, we have also at least two confounded factors in that kind of presentational manipulation.
The importance of information flow adjustment to the learners' speed of information processing was addressed by Mayer and Chandler (2001), who proposed that learner pacing reduces extraneous load on working memory and thus enables learners to build a more coherent mental model step by step. Learner pacing allows learners to stay longer on parts of information that are difficult to understand before the next part is processed (and thus results in an increase of study time). With additional time, more of the relevant information is processed into working memory as well as organised and integrated into a more coherent and complete mental model. This adjustment seems to be particularly helpful with time-dependent presentations, which only enable learners to perceive and process information within a given time period (Hasler et al., 2007; Mayer & Chandler, 2001; Moreno, 2007; Schwan & Riempp, 2004).
In this context of split attention, Tabbers (2002) and Stiller et al. (2009) have found an improvement in learning for visual texts with static visualisations by implementing a forward button to allow learner pacing. The visualisations did not change dramatically in time, that is, they were relatively stable and only parts of the visualisations were highlighted in correspondence to the presented text. A benefit of segmentation as with dynamic presentations was not given, because the material was already conceptually segmented. Additionally, Tabbers (2002) and Schmidt-Weigand (2006) investigated the effect of study time allowed by a presentational system to clarify effects of system pacing on split-attention effects and have found benefits of a prolonged study time. The studies are shortly reported in the following paragraphs.
Stiller et al. (2009) investigated the effects of pacing and text modality on learning in an online experiment. University students studied instructions on the human eye paced either by the system or the learner and using either visual or auditory texts with static pictures. Learner pacing reduced mental effort and promoted performance for instructions using visual texts. Surprisingly, the learner-paced, visual text instruction was studied faster than the system-paced version. This led to the interpretation that learners could easily compensate visual split-attention between on-screen texts and pictures and extract relevant information within the system-paced presentation periods per information unit, but were handicapped by waiting time for the next piece of information that interrupted processing. In other words, the effect of temporal split-attention was reduced by learner pacing.
Schmidt-Weigand (2006) investigated system pacing with animations on lightning formation. The animations were played in a slow, medium, and fast pace using either visual or auditory texts. A slower presentation rate led to marginally more success at retention and visual recall (drawing task), but not at transfer. Mental effort decreased significantly with expanded presentations for visual but not for auditory texts. Although Schmidt-Weigand (2006) used the most demanding presentation format of animation, he delivered only weak evidence for the assumption that prolonging presentation time allows an individual more adequate speed of information processing including a compensation of split-attention effect with visual text and pictures.
Tabbers (2002) used web-based lessons about a didactical model of instructional design (static diagrams were explained by auditory or visual texts), focusing on pacing and text modality. Information units were put in linear order, and when instructions were self-paced, learners could move forward along this line. In two experiments, the results showed that for on-screen texts mental effort was not influenced by pacing, performance of retention and transfer increased with more time on task when using system-paced instructions, and learner pacing additionally improved learning. Tabbers (2002) referred the improvement of learning with system-paced instructions to extended time on task, which is responsible for compensating split-attention effects, and argued that learner pacing additionally allows a higher quality of information processing with on-screen texts.
Moreover, Tabbers (2002) and Stiller et al. (2009) have shown that effects of learner pacing can depend on the text modality. They only found an improvement in learning for on-screen texts and static visualisations, whereas for auditory texts learner pacing was worthless or even detrimental in aspects of performance. The learner-paced, visual text instruction of Stiller et al. (2009) and Tabbers (2002) were also superior to the corresponding auditory text instructions.
Tabbers (2002) argued that learner pacing does not only allow control over the time spent on instructions and thus compensation of split-attention effects with visual texts, it additionally allows a higher quality of information processing with visual texts. He proposed that reading texts is a more active process that enables flexible as well as strategic processing of information. Jumping back and forth in written text to access or revisit pieces of information, for example, is much easier than with audio. A more flexible work-through might lead to a greater chance of retaining corresponding verbal and pictorial information in working memory, of improving mental representations by noticing formerly unnoticed but essential information, of mapping verbal and pictorial information adequately, and of using prior knowledge for knowledge construction. Perhaps learner pacing allows learners to transfer their successful and schematised reading behaviour to new instructional multimedia situations. For this reason, learner-paced instructions with visual texts might better satisfy the learners' individual cognitive needs with regards to information processing. For the detrimental effects of pacing with auditory texts, Tabbers (2002) complementally proposed that listening is a rather passive process which makes it suitable for linear presentations with minimal interactivity, as when instructions are paced and sequenced by the system. Learner pacing is incompatible with normal listening behaviour.
Firstly, the effect of pacing found by Stiller et al. (2009) with on-screen texts and pictures in an online setting should be replicated to gain supporting evidence of pacing effects with visual texts in more ecologically valid settings. Learners pacing the instruction should gain more knowledge and experience less mental effort than learners studying system-paced presentations (Stiller et al., 2009). The pace of a presentation determines the time available for information processing. If learners can affect the pace, they may choose one that matches their individual speed of comprehension. This also means that they can spend as much time as they need with the information presented, that is, learners are more likely to select relevant information and to organise and to integrate it adequately. Hence, we proposed that learner pacing is suitable for preventing working memory from being overloaded or at least for relieving working memory from extraneous load (Tabbers, 2002; Schmidt-Weigand, 2006).
Secondly, the extent that presentational speeds of pacing by the system are reflected in learning and how this can be explained should be clarified. Learners studying a fast or slow system-paced presentation should have less success in the performance tasks and experience more mental effort than learners who learn with a medium system-paced instruction. A main cause of effects is seen in split-attention effects. Depending on the speed of presentation, a visual or temporal split-attention effect is seen as the main contributor to an assumed pacing effect. Therefore, fast and slow pacing should mainly lead to visual and temporal split-attention effects, respectively, and a medium presentation speed should minimise but not eliminate visual and temporal split-attention effects. Henceforward, results can be used to improve interpretation of modality effects (i.e., learners learn more effectively in computer and book based environments when spoken instead of visual texts are used; Ginns, 2005), when they help to clarify the mechanisms that underlie the processing of system-controlled presentations of on-screen text and pictures.
|Fast system||Medium system||Slow system||Learner|
|Break offs (n = 27)||8||7||9||3||chi2(6) = 6.47 ns|
|Missing data (n = 27)||6||4||7||10|
|Accepted data sets (n = 142)||36||39||37||30|
|Male (n = 26; 28.31%)||9||7||6||4||chi2(3) = 1.69 ns|
|Female (n = 116; 81.69%)||27||32||31||26|
|TU Dortmund (n = 119)||29||31||34||25||chi2(6) = 6.99 ns|
|Uni. of Regensburg (n = 17)||6||5||1||5|
|Other (n = 6)||1||3||2||0|
|Semester of study||3.92||5.75||4.77||6.71||3.97||5.80||4.27||6.42||.85 ns|
Figure 1: Screenshot of the learner-paced instruction
Figure 2: Screenshot of a system-paced instruction
How were the presentation speeds of the system-paced instructions determined? Variances appeared due to the transfer rate of the web server. The low speeded presentation lasted 7:07 min on average (= 427 seconds, SD = 2.68) and corresponds to the system-paced, visual text instruction used by Stiller et al. (2009). The medium speeded presentation lasted 5:46 min on average (= 346 seconds, SD = 1.68) and was adjusted to the average study time of the learner-paced, visual text instruction used by Stiller et al. (2009). The average study time of the learner-paced instruction in this experiment was 5:31 min (= 331 seconds, SD = 116.70). The high speeded presentation lasted 4:14 min on average (= 254 seconds, SD = 1.78) and was determined by subtracting the difference of the mean presentation time of the system-paced visual text instruction and the mean study time of the learner-paced visual text instruction from the mean study time of the learner-paced visual text instruction used by Stiller et al. (2009).
A couple of numbers that were placed in the top left-hand corner of the display signalled the number of text units in the sequence and at which position of the sequence the learner was. In addition, in the system-paced conditions, the presentation durations of the text units were shown via a count-down from total playing time to zero.
The presentations were followed by three questions assessing three types of cognitive load (Schmidt-Weigand, 2006). Overall load was subjectively rated by "How easy or difficult was it for you to learn something about the eye from the presentation you just saw?", intrinsic load by "How easy or difficult would you consider the content?", and extraneous load by "How pleasant or bothersome would you consider the presentation format?". Participants were instructed to place a check mark for each question on a 7-point rating scale from very easy (pleasant), across easy (pleasant), rather easy (pleasant), medium, rather difficult (bothersome), difficult (bothersome), to very difficult (bothersome).
The performance test consisted of a verbal structure task, a transfer task, a pictorial labelling task, and a verbal retention task. Stiller et al. (2009) additionally showed some figures depicting what the students saw on their computers when actually performing the various tasks of the performance test.
|Verbal structure: correct details||7||56.84||29.44||.75||.90|
|Verbal structure: superfluous details||--||.54||.91||--||.99|
|Fast system||Medium system||Slow system||Learner|
|Verbal structure: correct details||-.74||-.63||1.49*||-.27||-1.34||1.22||-.84||.17||1.32||-.54||-.20||1.17|
|Verbal structure: superfluous details||2.27||4.70||2.48**||1.64||1.69||2.57**||1.50||2.65||1.91**||2.40||5.64||2.31**|
The ANOVAs revealed a significant effect of pacing on extraneous and overall load, but no effect on intrinsic load (see Table 4). As shown by contrasts (see Table 5), with learner pacing, students experienced lower extraneous load than with system pacing and a corresponding effect could be observed for overall load. The means of the system-paced groups did not differ significantly.
|Fast system||Medium system||Slow system||Learner|
|Verbal structure: correct details||57.94||31.66||44.69||30.78||58.69||27.93||69.05||20.23||4.31**||.09|
|Verbal structure: superfluous details||.50||1.00||.51||.88||.70||.94||.40||.81||.66||.01|
Pacing had no significant effects on verbal retention, reporting superfluous details in the verbal structure task, and transfer (see Table 4). For structural knowledge as measured by listing correct elements, a significant effect was found. With learner pacing, students reported more correct items in correct order than with system pacing (see Table 5). The system-paced groups also differed. Thereby, the medium system-paced group showed worse performance than the fast and slow system-paced groups, which did not differ significantly.
A significant effect of pacing occurred when students labelled pictures (see Table 4). With learner pacing, students could label more pictorial elements than with system pacing (see Table 5). Furthermore, the medium system-paced group showed worse performance than the fast system-paced group and did not significantly differ from the slow system-paced group, while the fast and the slow system-paced groups also did not differ significantly.
|Learner - system||Fast - medium||Fast - slow||Slow - medium|
|Overall load||t(138) = -3.32***||t(138) = -.89||t(138) = -1.42||t(138) = -.55|
|Extraneous load||t(138) = -3.58***||t(138) = -1.08||t(138) = -1.22||t(138) = -.16|
|Verbal structure correct details||t(67.40) = 3.27***||t(138) = 2.02*||t(138) = .11||t(138) = 2.15*|
|Labelling pictures||t(53.83) = 2.37**||t(72.14) = 2.27**||t(138) = 1.59||t(70.10) = .84|
For system-paced presentations, a main cause of pacing effects was suggested to be visual or temporal split-attention effects, depending on the speed of presentation. We assumed that a fast and slow pacing mainly lead to visual and temporal split-attention effects, respectively, and that a medium presentation speed should reduce but not eliminate visual and temporal split-attention effects. Hence, learners who learn with the medium system-paced instruction should have more success in the performance tasks and experience less mental effort than learners studying the fast and slow system-paced presentations. This perspective must be revised, because results do not correspond with this argumentation and the results reported in literature (Tabbers, 2002; Schmidt-Weigand, 2006). Three important aspects are considered in the following paragraphs.
Firstly, one of the main ideas behind cognitive load theory is that a more efficient use of working memory resources is needed when there is a risk of overload (Sweller, 2005). Consequently, the use of visual text in system-paced multimedia instructions will only be harmful for learning when cognitive load is high. If not, the learner can compensate the increase in memory load by spending more mental effort and obtaining the same learning outcomes as with a more adequate presentation. On this background, looking at overall and extraneous mental effort in this study, it seems that the speeds of the system-paced instructions were overall moderate, and therefore not very load demanding. Presentations were maximally regarded as being in the middle and lower range of difficulty. The performance of the fast system-paced group especially indicates that visual split-attention did not play the dominant role as suspected. The mental effort ratings show that this was the most load demanding presentation, but mean ratings were in the medium range and not significantly higher than the other group ratings. Therefore, learners appeared to compensate the suspected badly designed presentation by investing more effort. Noteworthy is the result that the fast system-paced group was descriptively the most successful system-paced group, even approaching the level of performance of the learner-paced group. Generally, this questions the relevance of visual split-attention effects for the fast system-paced as well as the other system-paced learning condition.
Secondly, the slow system-paced group was assumed to suffer from temporal split-attention, therefore, being outperformed by the learner-paced group (Stiller et al., 2009). The fact that the means of performance were lower than with learner pacing also bolsters this assumption. But an alternative argument might better explain the results. In contrast to the slow system-paced instruction, a more rapid presentation could be more challenging to the learners, in order to overcome presentational handicaps, than a too-slow presentation. In other words, learners might be more interested in investing more mental effort to overcome working memory limits of capacity than limits in time as indicated by mental effort ratings. We might assume that a reduced processing time forces learners to process information more effectively in motivational aspects (Canelos et al., 1989; Schnotz, Fries & Horz, 2009), as long as there is no threat of cognitive overload.
Thirdly, the main contradictory aspect is that the medium system-paced instruction proved to be the worst in terms of performance. This result was not expected, because we assumed that a medium pace allows the learners to suffer less from visual split-attention effects with fast presentations, and it concurrently reduces temporal split-attention effects, which occur when learners have to wait too long for the next bit of information. Moreover, this group showed the worst performance scores of all learning groups. One possible reason for the result could be related to motivation. This presentation mode could arguably have been less challenging, hence, learners did not try as hard as in the fast and slow system-paced group.
Summarised according to a motivational view, learner pacing might optimally trigger motivation, leading to an increased probability of engaging in meaningful processing, and thus to better test performance (Schnotz et al., 2009). This argumentation can already be found in older literature about learning with interactive computer instructions (Keller, 1983; Milheim & Martin, 1991; Steinberg, 1989). Nevertheless, this proposed effect might be accompanied by reducing visual and temporal split-attention effects. For system pacing, as long as the presentation does not essentially hinder learning, or exceed information processing capacity by extraneous load, effects might better be explained in motivational aspects, because cognitive aspects might not play that dominant a role (Schnotz et al., 2009).
In technical aspects, we advise to implement learner pacing for multimedia instructions consisting of static pictures and visual texts (Betrancourt, 2005; Mayer, 2005). When system-paced presentations are used, presentation time is a necessary consideration. As shown, giving more study time is not always beneficial for learners and might be even detrimental for performance (Canelos et al., 1989; Stiller et al., 2009). To account for this, multimedia designers should be given some empirically based rule to be able to calculate presentation time from text length and text difficulty. This can only be a suboptimal solution as we know that the individual reading speed and hence the individual speed of comprehension varies significantly between learners (Schmidt-Weigand, 2006).
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|Authors: Klaus D. Stiller, Kirstin Petzold and Peter Zinnbauer|
Department for Experimental Psychology, University of Regensburg, 93040 Regensburg, Germany
Author for correspondence: Klaus D. Stiller. Email: Klaus.Stiller@psychologie.uni-regensburg.de
Please cite as: Stiller, K. D., Petzold, K. & Zinnbauer, P. (2011). Presentation time concerning system-paced multimedia instructions and the superiority of learner pacing. Australasian Journal of Educational Technology, 27(4), 693-708. http://www.ascilite.org.au/ajet/ajet27/stiller.html