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to a detriment in memory for peripheral details in both cases. The lack of a central-peripheral trade-off in memory for positive emotional stimuli in this experiment could be explained by the lower levels of emotional arousal for the positive than negative stimuli. Due to the nature of stimuli used in this experiment it was not possible to fully match the arousal levels across valence, but it is possible that a central-peripheral trade-off in memory for positive stimuli would appear if it were possible to match arousal levels between negative and positive stimuli. In conclusion, these results replicated findings of Kensinger and colleagues (2006, 2007a, 2007b) with regards to negative objects using a new stimulus set. However, they call into question the degree to which all such emotional effects can be attributed to overt attentional processes at the time of encoding and also highlight the different processes which may be responsible for the effects of positive emotions on memory. The effects of negative emotion appear to be associated with spatial differences in attention, as measured by eye movements, but the effects of positive emotion do not. 181
Chapter 5 – Which alternatives to attention focusing could explain emotional enhancement of visual memory specificity? Section 1. Chapter Introduction In this chapter we further explore the way in which cognitive processes may be affected by emotion and lead to the enhancement of memory for specific visual details. From chapter 4 we concluded that the focusing of attention onto the source of emotion was an important factor in the process of enhancement of memory by negative emotion but not by positive emotion. However, there have been studies of memory for central and peripheral information which have not supported the attentional narrowing hypothesis (e.g. Libkuman, Nichols-Whitehead, Griffith, & Thomas, 1999; Wessel, van der Kooy, & Merckelbach, 2000). In this chapter we firstly replicate the finding of attention narrowing from chapter 4 and then investigate whether any other measures of memory performance reveal further insight into the process by which emotion influences memory for specific visual details. We then consider the influence of any carry-over of emotion that might occur between stimuli, the unexpected nature of emotional stimuli and the distinctiveness of emotional stimuli. These are all other potential factors which may in some way be responsible for the emotional enhancement of memory for specific visual details. We will now consider the relevant literature for each of these different possibilities. 182
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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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Page 138 and 139: Levine & Bluck, 2004; Storbeck & Cl
Page 140 and 141: Figure 4.1. Examples of pairs of ne
Page 142 and 143: Familiarity i) Word frequency and w
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Page 146 and 147: Table 4.1. Experiment 5: Proportion
Page 148 and 149: memory for positive stimuli. These
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Page 152 and 153: Figure 4.3. Examples of stimuli. St
Page 154 and 155: 0.59 (-1.65 to 2.55; 0.98) respecti
Page 156 and 157: Section 3.3. Results The data for t
Page 158 and 159: Figure 4.4. Mean average specific a
Page 160 and 161: The possibility of a response bias
Page 162 and 163: Section 4. Experiment 7: Biases in
Page 164 and 165: of an attentional encoding explanat
Page 166 and 167: esults will be found as for Experim
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Page 170 and 171: Table 4.3. Mean responses (SE) for
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Page 174 and 175: Table 4.4. Mean average (SE) number
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Page 178 and 179: difference between scenes with a ne
Page 180 and 181: of memory for positive objects was
Page 182 and 183: independent of attention, which is
Page 184 and 185: lack of a central-peripheral trade-
Page 188 and 189: Alternative measures of memory: Ass
Page 190 and 191: associative binding (Touryan et al,
Page 192 and 193: greatly diminish or disappear with
Page 194 and 195: Factors unrelated to intrinsic emot
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Page 198 and 199: We predict that the pattern of memo
Page 200 and 201: ackground they had seen in the stud
Page 202 and 203: component (F(2,34) = 5.45, MSe = 0.
Page 204 and 205: Associative Memory In the associati
Page 206 and 207: The number of fixations made were a
Page 208 and 209: longer total gaze duration on the e
Page 210 and 211: .54], nor on backgrounds of scenes
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Page 214 and 215: Section 3.1. Introduction Section 3
Page 216 and 217: were then shown, preceded by a 20 s
Page 218 and 219: 2.56, p < .001, partial eta 2 = .71
Page 220 and 221: (negative, neutral, positive) and s
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Page 224 and 225: eradication of any emotional enhanc
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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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ackground of the scene. There was n
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Section 3.4. Discussion There was e
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identify with eye movement recordin
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Table 5.7. Average ratings (standar
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emotional influence on the results
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Figure 5.7. Specific and general re
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ecognition of positive and negative
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Figure 5.9. Specific and General Re
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Section 5.3. Eye movement results T
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.01). Post-hoc Tukey’s HSD were u
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The number of fixations made on dif
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(F(1.79,5.37) = 7.12, MSe = 232535.
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emotional and neutral object [F(1,6
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Figure 5.16. Experiments 7 - 10: Av
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may be that the scenes were easier
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Chapter 6. Discussion In the final
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In chapter 4 I extended the experim
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Figure 6.3 Summary of findings from
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alternative measures of attention h
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distribution of visual attention re
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designing and conducting experiment
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contributed to the difficulty in cr
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whether these perceptual difference
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Richardson-Klavehn, 2005) with the
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High Threshold Theory (Macmillan &
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participant and the artificial prod
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References Adolphs, R. (2002). Reco
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Buchanan, T. W. (2007). Retrieval o
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Davidson, R. J. (1994). On emotion,
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Gardiner, J. M., Ramponi, C., & Ric
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James, W. (1884). What is an emotio
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Levine, L. J., & Bluck, S. (2004).
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components. Journal of Experimental
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Rowe, G., Hirsh, J. B., & Anderson,
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Talmi, D., Schimmack, U., Paterson,
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Zajonc, R. B. (1968). Attitudinal e
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Appendix 2.2. ANOVA Analyses for Ex
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Table 2.2.4. Experiment 1: Separate
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Appendix 3.2. Contamination of Retr
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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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