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Figure 4.3. Examples of stimuli. Stimuli were shown in colour for the experiment. One pair each of negative objects, neutral objects, positive objects and neutral backgrounds were used to create 12 versions of each scene to allow counterbalancing of whether items shown at test were same, similar or new in comparison to items shown at study. The ratings obtained for Experiment 5 were used to match the negative, neutral and positive groups of stimuli for ratings of perceptual features and familiarity and to provide distinct groups of emotional valence and arousal. It was more difficult to obtain close matches between the ratings of negative, neutral and positive object pair groups in this experiment than in Experiment 5 due to the necessity of ensuring that scenes were contextually and graphically 147
congruent with a pair of negative, neutral and positive objects. Average ratings of how these dimensions changed between the items in a pair were comparable between different emotional groups. The item means (with standard deviations in parentheses) for negative, neutral and positive object pairs were: for orientation .62 (.33), .56 (.33) and .55 (.36); for shape .45 (.30), .42 (.28) and .37 (.28); and for size .22 (.24), .20 (.25) and .19 (.24) respectively. There were also comparable average mean ratings (with standard deviations in parentheses) between negative, neutral and positive object groups for similarity between objects within a pair 3.38 (1.38), 3.94 (1.30) and 3.75 (1.29); and for familiarity of the object 4.49 (2.40), 4.57 (3.82) and 3.93 (3.79) respectively. A comparable number of objects would fit into a shoebox for negative, neutral and positive emotion groups, these were 27, 31 and 26 respectively. The negative object pairs had a lower average rating for the change of colour between two items in a pair than the positive and neutral pairs, the average means (with standard deviations in parentheses) were .46 (.32), .62 (.32) and .60 (.36) respectively. Therefore, the colour of one item from each of 15 negative pairs (which had low ratings) was altered by adjusting the saturation levels of the red/green/blue channels in Adobe Photoshop. These adjusted pairs of items were rated for the dimension of change in colour by two participants and had a new overall average .56 (SD = .32) which was comparable to the ratings for neutral and positive object pairs. The negative, neutral and positive objects all had distinct item mean average ratings (with range and standard deviation in parentheses) for valence - 2.51 (-4.35 to -0.55; 0.81), .53 (-0.45 to 1.45; 0.46) and 2.33 (1.55 to 3.45; 0.41) and for arousal 1.97 (0.75 to 3.55; 0.64), -0.23 (-1.20 to 0.45; 0.36) and 148
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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
Page 102 and 103: stimuli, which corresponded with mo
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Page 106 and 107: paradigm was first introduced by Tu
Page 108 and 109: The nature of recognition memory an
Page 110 and 111: The relation between Remember/Know/
Page 112 and 113: We proposed that a Remember respons
Page 114 and 115: to either the RKN or SSN memory tas
Page 116 and 117: change in a dimension (e.g., a ligh
Page 118 and 119: were prompted to indicate by key pr
Page 120 and 121: When you think the picture was not
Page 122 and 123: conducted to further analyse the ma
Page 124 and 125: interactions in the ANOVAs were fou
Page 126 and 127: Table 3.9. Same/Similar/New task: N
Page 128 and 129: Orthogonal contrasts revealed that
Page 130 and 131: Table 3.11. Remember/Know/New task:
Page 132 and 133: suitable responses were not equable
Page 134 and 135: We found that more ‘remember’ r
Page 136 and 137: say that context is easier to remem
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
Page 144 and 145: were not sure if there was going to
Page 146 and 147: Table 4.1. Experiment 5: Proportion
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Page 150 and 151: whether visual specificity for posi
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
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Page 162 and 163: Section 4. Experiment 7: Biases in
Page 164 and 165: of an attentional encoding explanat
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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
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Page 184 and 185: lack of a central-peripheral trade-
Page 186 and 187: to a detriment in memory for periph
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
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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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were then shown, preceded by a 20 s
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2.56, p < .001, partial eta 2 = .71
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(negative, neutral, positive) and s
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object in a scene. There was no sig
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eradication of any emotional enhanc
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possible that the emotional stimuli
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central-peripheral trade off in the
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Section 3.3. Results Results of the
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Planned contrasts revealed the impa
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component (object, background) inte
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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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