Still22

From Psy241wiki

Jump to: navigation, search
         This is an OLD VERSION, recorded so you can compare and contrast
         Current grade = high 2:2 (although strong in places, with some good attention to detail, some details are missing 
         from the procedure and results sections - which are key - and throughout there are a few inconsistencies and mistakes).
         
         Compare previous versions 


Please edit individual sections, rather than the whole page, to avoid conflicts

Contents

Title

         Good - a simple description of the experiment

The effect of automaticity on processing speeds in visual search tasks

Abstract

         This is ok, clear and focussed on the right things: what the theories were, and what you did
         The final lines are the right topic - an explicit interpretation of what the theorertical implications are of the results - but it isn't as clear as is could.
         Notice how the description of the conditions has been improved by making it very explicit
           - e.g. 'a varied mapping condition (looking for a target letter(s) in an array of distractor stimuli which were also letters)'
         Don't be afraid of being wordy on important elements such as definitions


An investigation was undertaken to test Schneider & Shiffrin's theory of automatic processing (1977). Schneider and Shiffrin adapted Sternberg's (1960) high-speed memory scanning paradigm to identify whether a greater number of distractors present increased the time it took participants to look for a target. Expanding on Sternberg's findings, they also looked at whether the type of stimuli participants had to search for (looking for digits or letters) would affect their processing and therefore their response times. To investigate this, subjects took part in a between participants experimental design and were either assigned to a varied mapping condition (looking for a target letter(s) in an array of distractor stimuli which were also letters) or a consistent mapping condition (looking for a target digit(s) in an array of distractor stimuli that were letters). It was found that response times were slower when more potential targets had to be searched for, and quicker for those in the consistent mapping condition. There was no significant effect found between condition and task. This suggests that automatic processing taking place during tasks is not exclusively related to the number of potential targets or sub-tasks involved in a task, but may also be influenced by the types of sub-tasks involved.

Introduction

No more than one side

Hypotheses

         Good. You might make explicit why these hypotheses stem from the theory. 
         If you have multiple predictions (as you do here), it makes sense to make clear which stem from which theory, and which is most surprising/interesting

Based on Sternberg's findings (1966), it is predicted that the more targets participants need to search for, the slower their responses will be.

Furthermore, based on Schneider & Shiffrin's findings (1977), an additional prediction is that those in the consistent mapping condition (condition 2, digits) will have an overall quicker response than those in the varied mapping condition (condition 1, letters).

The final experimental hypothesis it is predicted that there is a significant interaction, between number-of-targets and condition that the effect of number-of-targets is greater under condition 1 than under condition 2.

Method

Participants

         This is almost perfect. Brief and to the point. 
         Psychologists will, in general, be interested in how you did your random allocation (since this is often a way biases creep into an experiment)
         This section also anticipates that the average reader wondering why there are so many more people in condition 1 than condition 2. 
         Providing details, even if the answers is that the method wasn't very systemmatic (as in this case), is always the best option
         

Overall, there were 172 participants, 103 in condition 1 (Targets were Letters, Distractors were Letters), 69 in condition 2 (Targets were Digits, Distractors were Letters). All participants were second year undergraduates at the University of Sheffield, reading Psychology. Gender and age was not recorded because we were not looking for any effects of age and gender. However, the majority of these students were of conventional university-attending age (age 19-21), and the majority of these students were female. Participants were an opportunity sample, recruited through a module class.

Participants were randomly allocated to one of the two conditions. Participants were allocated according to where they were seated in the room: Participants near the front were placed under condition 2 while participants near the back were placed in condition 1. There were more people sitting further back in the room which may have resulted in a larger sample size in condition 1 compared to condition 2.

Apparatus/Materials

       Does the first sentence add much information?
       Try to make the labels and terms consistent throughout the report
       Some of this isn't clear, with essential information missing (e.g. the number of trials)
       Good points include : mentioning the two factors (and whether they were within or between), how the response recorded
       You don't need to mention the SPSS version number - we assume that the stats would be the same whatever version you used.
       It is better to mention the materials used at the same time as how they were used.
       Standard items (tables and chairs) don't need to be explicitly spelt out. 
       For example you might say 'participants sat in front of a PC, which displayed the stimuli'

All participants undertook the task on a university computer, in the computer room, within the Psychology building. Participants were placed in one of three groups due to space limitation.

Materials used include:

1) Computer. The same computer was not used for each participant, however each used a similar computer within the same room and under the same experimental conditions.

2) Mat lab.

3) Chair.

4) Table.

In each trial, the participants viewed slides which informed them of the target number for that particular set of stimuli. During the experimental condition, a slide showed a set of distractors from which the target had to be recognised. Once participants saw the target, they had to press the spacebar button as quickly as possible, which would then initiate a response and tell them that they found a target or that they haven't on that particular trial. There were up to four slides of information for each trial, and the position of the target within them changed every time. The target stimuli varied depending on the condition (between-participants). Group 1 had to find a target digit in a random set of digits . Group 2 had to find a target digit in a set of letter distractors. The number of targets to be found was manipulated in both conditions (within-participants) so that participants either had to remember one, two or three target digits. The software gave out three scores at the end of the experiment, with the average response times from each participant to 1, 2 or 3 target numbers.

Design

      Good to start by mentioning the design, making it explicit which factors were within subjects and which between.
      I would prefer to say 'number of targets' varied within subjects, as this is full and explicit.
      After introducing the design it is good to follow up by mentioning the factors, and the levels (define these)
      Then the DV(s) 

The experiment was a mixed measures design where targets varied within subjects and conditions between subjects. Thus each participant took part in only one condition, one at a time, but they were also asked to seek a different number of targets.

There were two factors in this study, the number of potential target and the type of potential target. The number of potential target had three levels - one, two and four while the type of potential target has two levels - targets and distractors, where they were both letters (condition 1) or targets were digits and distractors were letters (condition 2). The dependent variable of the study was mean reaction time to correct responses.

Procedure

Sufficient detail for someone else to replicate

Results

         Did you test the DVs for normality? How can a violation of this assumption be dealt with?
         If it was me I'd make sure that the reader knew that I knew that the ANOVA was a 1-within, 1-between ANOVA, but 'mixed' is acceptable
         Ideally you would show a graph, but I know you can't upload figures to the wiki, so a table will have to do (showing mean RT in each of the six conditions)
         Channel capacity would also allow a better discussion, which speaks to the research mentioned in the introduction



A 2 way (mixed) ANOVA was carried out on the data. The assumption of spehricity was violated and therefore a Greenhouse-Geisser correction was used. Results showed that there was a significant main effect of condition (F(1,170)=15.8, p<.001) on participant's reaction times in responding to the targets. Participants in condtion 1 (M=.878, SE=.01) were overall slower than those in condtion 2 (M=.818, SE=.012). There was also a significant main effect of target (F(2,259)=204.7, p<.001) on particpant's reaction times, with participants being slower when they had to search for four targets (M=.969, SE=.013) than for two (M=.853, SE=.009) and one target (M=.723, SE=.009). As figure 1 shows, there was no significant interaction of target and condition (F(2,259)=.919, p=.377).


Present the descriptive statistics (mean latency + sd) for each condition, followed by the inferential statistical. Then calculate the ‘channel capacity’ for Conditions 1 and 2

Discussion

       1st para: You need to be very careful invoking the concept of attention as an explanation in a study of attention: 
       --- does saying the task requires 'more attention' explain or just describe the result?
       Other sentences in this paragraph need rewriting to be clearer
       
       2nd para: good to link back the study to general theory
       3rd para: now neuroscience - great stuff, integrating different kinds of methods/perspectives on the topic
       4th para: limitations, and qualifications. More to be said here
       

Was the hypothesis supported? If not, why not? Ways the experiment might be improved. Any other relevant observations.

The findings support the first two experimental hypotheses: that response time would be slower for those in condition 1 than in condition 2, and that response time would be slower when there were more targets to search for. This is because when a task requires more attention, it involves controlled processing, and is therefore more likely to be serially processed (Schneider & Shiffrin, 1977). Serial processing will take longer because stimuli has to be processed in turn. Furthermore, controlled processing has been found to occur more so during a novel situation (learning something new). It may be that condition 2 had a quicker response because participants have learnt to separate digits from letters since they could first read. This has been practiced so often that it becomes more automatic, requires less attention, and therefore can be processed quicker.

Furthermore, models such as the ACT* (Anderson, 1992) support Schneider & Shiffrin's findings and predictions about automatic and controlled processing. Schneider & Shiffrin explain such processes in terms of their access to 'nodes' of knowledge: automatic processes generally have consistently good and direct access to nodes, which is why they require less attention, whereas controlled processes have more unstable and weaker access which must be tended to (via practice) in order to strengthen its access so that it eventually becomes a direct link/automatic process. This is supported by the semantic network structure of ACT*, and Loftus & Collins' addition of criteriality (1975).

Neuroscientific findings on the cerebellum and frontal cortex on learning also support these findings (Jansma et al., 2001). These parts of the brain are involved in the learning of new motor and cognitive actions, and, concerning automatic processing, they need to practice the skill repeatedly in order to keep the connections strong and active - automatic. This suggests that the ability to separate digits and letters may be because the neural connections for this task are often activated, and therefore run more efficiently.

(ALSO, I HAVE A FEELING THAT CORTICAL PLASTICITY IS RELATED TO THIS BUT WILL NEED TO READ OVER ARTICLE TO CHECK).

However, it is worth noting that the lack of significance found in the interaction between task and condition did not support our third experimental hypothesis. This also contradicts Schneider & Shiffrin's finding that the number of targets would not vary the speed of the participants' responses in condition 2 because they are able to separate digits and letters so automatically. This may be related to not having a normally distributed sample, so a further retest with a normally distributed sample would have to be undertaken before considering other possible factors.

 To other contributors: Not sure if this is entirely relevant, but we might want to expand this by suggesting how this finding can be applied in everyday scenarios of learning. After all, being able to do something automatically is a desirable attribute. The study still has a long way to go in terms of describing the conversion of controlled processing into automatic processing. What are the other factors that is has not considered? 

References

Schneider, W. and Shiffrin, R. M. (1977). Controlled and automatic human information processing: 1. Detection, search, and attention. Psychological Review, 84, 1-66.

Personal tools