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Chapter 6. Discussion In the final chapter of this thesis I will summarise my research findings, discuss ideas for continuing this research, and consider how the research in this thesis informs a number of issues: the choice of experimental stimuli in the study of emotion; the influence of task instructions on experimental paradigms and the influence of emotion on different memory processes. Section 6.1. Summary of findings In this thesis I have examined the influence of emotion on memory. I began in chapter 2 by considering how factors at the time of retrieving a memory may be influenced by emotion and proposed that emotions of different valence may encourage the use of different strategies to retrieve memories. I found an emotional enhancement of memory for pictures which was restricted to positive emotion and only present with recognition tasks which encouraged the use of a nonanalytic processing strategy at retrieval, that is to say with a traditional / straightforward recognition task and a nonanalytic recognition task (see Figure 6.1). An additional and unexpected finding was that when recognition was followed by a Remember/Know/Guess judgement for each item there was no emotional enhancement of memory. Figure 6.1 Summary of findings from Chapter 2 261
In chapter 3 I addressed two research questions. Firstly, I extended the research of chapter 2 by designing a within participants version of the between participants paradigm which had been used to examine retrieval strategies. Unfortunately the experimental paradigm did not successfully translate into a within participants design, however, the experiments did suggest that there may be interesting implications of using different methodologies to investigate the effects of emotion on memory. In the next phase of research in this chapter I continued the exploration of different paradigms. Specifically, I compared the pattern of results from the well-know Remember/Know/New paradigm (Tulving, 1985) with the more recently developed Same/Similar/New paradigm which has been used to demonstrate some interesting effects with emotion and memory (e.g. Kensinger, Garoff-Eaton, & Schacter, 2006). A memory advantage for negative emotional stimuli was found in both paradigms (see Figure 6.2). The results from the Same/Similar/New paradigm appeared more straightforward to interpret in the context of this type of experiment with the advantage of clear and well-defined criteria by which participants chose their responses. Therefore, I continued with this experimental paradigm in the investigation of cognitive processes underlying the influence of emotion on memory. Figure 6.2 Summary of findings from Chapter 3 262
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THE EMOTIONAL ENHANCEMENT OF MEMORY
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the memory effects. Surprisingly, t
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and motivation was waning. Most imp
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Meta-analysis: Experiments 6-10…
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negative, neutral or positive objec
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Figure 6.2. Summary of findings fro
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Table 3.5. Criteria for giving resp
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avoidance task ………………
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loved one could block their ability
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eport, physiological response and c
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Section 1.2. What effects do emotio
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due to external influences. In cont
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of naturally occurring emotions or
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ecause mood inductions generally re
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(e.g. Conway et al., 1994). Memory
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alternatives (Lockhart, 2000). The
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equired participants to distinguish
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een found when memory is assessed b
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peripheral elements of emotional an
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processing of the specific content
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failure to retrieve episodic memori
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effects on cognitive processes, eve
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ecollection and familiarity within
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emotional influence on memory. In t
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year (Dolcos et al., 2005). There a
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e suitable for investigating memory
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possible that having to distinguish
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of photographs of people, animals a
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Retrieval phase: Participants then
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y the ANOVA’s. These are only rep
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Table 2.1: Experiments 1 and 2: Res
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In these experiments the influence
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We found evidence of recognition me
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For the recognition test, which was
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Section 5. Experiments 2A and 2B: P
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items that had been seen previously
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Section 7. Experiment 2E: Recogniti
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Table 2.2. Experiment 2: Results of
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For the ‘know’ responses the ma
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Section 8. Experiment 2 - General D
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Presentation of stimuli in blocked
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It is possible that the act of maki
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enhancement can be influenced by re
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levels of memory between the positi
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the performance of any subsequent t
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experiment to provide a set of targ
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Experimental stimuli were presented
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Recognition performance in all thre
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Analysis of RKG responses We analys
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Further signal detection analysis o
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stimuli, which corresponded with mo
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could be generalised to the real-wo
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paradigm was first introduced by Tu
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The nature of recognition memory an
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The relation between Remember/Know/
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We proposed that a Remember respons
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to either the RKN or SSN memory tas
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change in a dimension (e.g., a ligh
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were prompted to indicate by key pr
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When you think the picture was not
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conducted to further analyse the ma
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interactions in the ANOVAs were fou
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Table 3.9. Same/Similar/New task: N
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Orthogonal contrasts revealed that
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Table 3.11. Remember/Know/New task:
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suitable responses were not equable
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We found that more ‘remember’ r
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say that context is easier to remem
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Levine & Bluck, 2004; Storbeck & Cl
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Figure 4.1. Examples of pairs of ne
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Familiarity i) Word frequency and w
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were not sure if there was going to
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Table 4.1. Experiment 5: Proportion
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memory for positive stimuli. These
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whether visual specificity for posi
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Figure 4.3. Examples of stimuli. St
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0.59 (-1.65 to 2.55; 0.98) respecti
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Section 3.3. Results The data for t
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Figure 4.4. Mean average specific a
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The possibility of a response bias
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Section 4. Experiment 7: Biases in
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of an attentional encoding explanat
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esults will be found as for Experim
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of one second was displayed before
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Table 4.3. Mean responses (SE) for
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greater recognition for the objects
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Table 4.4. Mean average (SE) number
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eveal a significantly longer total
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difference between scenes with a ne
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of memory for positive objects was
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independent of attention, which is
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lack of a central-peripheral trade-
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to a detriment in memory for periph
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Alternative measures of memory: Ass
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associative binding (Touryan et al,
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greatly diminish or disappear with
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Factors unrelated to intrinsic emot
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faces or places (Puri & Wojciulik,
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We predict that the pattern of memo
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ackground they had seen in the stud
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component (F(2,34) = 5.45, MSe = 0.
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Associative Memory In the associati
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The number of fixations made were a
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longer total gaze duration on the e
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.54], nor on backgrounds of scenes
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the background when presented later
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Section 3.1. Introduction Section 3
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Page 220 and 221: (negative, neutral, positive) and s
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Page 230 and 231: Section 3.3. Results Results of the
Page 232 and 233: Planned contrasts revealed the impa
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Page 238 and 239: Section 3.4. Discussion There was e
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Page 242 and 243: Table 5.7. Average ratings (standar
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Page 246 and 247: Figure 5.7. Specific and general re
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Page 250 and 251: Figure 5.9. Specific and General Re
Page 252 and 253: Section 5.3. Eye movement results T
Page 254 and 255: .01). Post-hoc Tukey’s HSD were u
Page 256 and 257: The number of fixations made on dif
Page 258 and 259: (F(1.79,5.37) = 7.12, MSe = 232535.
Page 260 and 261: emotional and neutral object [F(1,6
Page 262 and 263: Figure 5.16. Experiments 7 - 10: Av
Page 264 and 265: may be that the scenes were easier
Page 268 and 269: In chapter 4 I extended the experim
Page 270 and 271: Figure 6.3 Summary of findings from
Page 272 and 273: alternative measures of attention h
Page 274 and 275: distribution of visual attention re
Page 276 and 277: designing and conducting experiment
Page 278 and 279: contributed to the difficulty in cr
Page 280 and 281: whether these perceptual difference
Page 282 and 283: Richardson-Klavehn, 2005) with the
Page 284 and 285: High Threshold Theory (Macmillan &
Page 286 and 287: participant and the artificial prod
Page 288 and 289: References Adolphs, R. (2002). Reco
Page 290 and 291: Buchanan, T. W. (2007). Retrieval o
Page 292 and 293: Davidson, R. J. (1994). On emotion,
Page 294 and 295: Gardiner, J. M., Ramponi, C., & Ric
Page 296 and 297: James, W. (1884). What is an emotio
Page 298 and 299: Levine, L. J., & Bluck, S. (2004).
Page 300 and 301: components. Journal of Experimental
Page 302 and 303: Rowe, G., Hirsh, J. B., & Anderson,
Page 304 and 305: Talmi, D., Schimmack, U., Paterson,
Page 306 and 307: Zajonc, R. B. (1968). Attitudinal e
Page 308 and 309: Appendix 2.2. ANOVA Analyses for Ex
Page 310 and 311: Table 2.2.4. Experiment 1: Separate
Page 312 and 313: Appendix 3.2. Contamination of Retr
Page 314 and 315: Appendix 4.1 Analysis of Same, Simi
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Scene component* emotion* response
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Section 4.1.2 Analysis for Experime
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Emotion* Response type F(4,68) = 0.
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esponse F(1,17) = 0.25, New respons
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Scene component* Response type Tuke
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Same response Similar response New
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Effect ANOVA result Response type F
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Similar response New response Same
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Tukey’s post hocs: For objects Sa
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esponse F(1,17) = 1.95, Similar res
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