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items that had been seen previously when they had been shown 5 times, with a trend in the same direction for those shown 3 times. An emotional enhancement of memory was found with photos from the positive block more likely to be recognised than those from the neutral block. The results for the recognition tests were in the same direction, and of the same effect size for emotion, to those obtained with the shorter 40 msec photo duration. Section 6. Experiments 2C and 2D: Analytic and Nonanalytic Recognition Section 6.1. Introduction It was expected that we would observe the same pattern of results here as those found in experiments 1C and 1D. Section 6.2. Method Participants. Twelve University of <strong>Nottingham</strong> students participated in Experiment 2C (Mean age 21.67 years (SD 2.46 yrs); 6 female), and 12 in Experiment 2D (Mean age 19.92 years (SD 1.16 yrs); 10 female). Procedure. An identical procedure was used for Experiments 2C and 2D, as for Experiments 1C and 1D, except that the length of photo exposure in the training phase was extended to 80 msec. Section 6.3. Results For analytic recognition in none of the conditions were the ‘old’ photos more likely to be selected than chance [One: t(11) = 0.26, p = .80, d = 0.07; 67
Three: t(11) = 1.53, p = .16, d = -0.44; Five: t(11) = 1.61, p = .14, d = 0.46]. For nonanalytic recognition photos shown once were no more likely than chance to be selected [t(11) = 1.60, p = .14, d = 0.46]. However, photos shown three or five times were more likely to be selected than chance (Three: t(11) = 3.38, p < .01, d = 0.97; Five: t(11) = 5.64, p < .001, d = 1.63). For analytic recognition, the 3 (emotion) x 3 (repetitions) repeated measures ANOVA found no significant effects for the main effects of emotion block and repetitions nor for the interaction between emotion block*repetitions. For nonanalytic recognition, the 3 (emotion) x 3 (repetitions) repeated measures ANOVA found there was a significant effect of emotion block but not of repetitions nor of the interaction between emotion block*repetitions. Post hoc analyses for emotion block revealed that significantly more ‘old’ photos were selected from the positive than from the neutral group (q = 4.36, p < .05), and from the positive than from the negative group (q = 5.04, p < .01). Section 6.4. Discussion For analytic recognition, results were similar to those found with the shorter duration. There was still no evidence of recognition, and no effect of emotion block or number of photo repetitions. With nonanalytic recognition the expected emotional enhancement of memory that we did not find at 40 msec, appeared with a photo exposure of 80 msec. There was an emotional enhancement of memory for positive over neutral and negative stimuli. 68
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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
Page 21 and 22: Section 1.2. What effects do emotio
Page 23 and 24: due to external influences. In cont
Page 25 and 26: of naturally occurring emotions or
Page 27 and 28: ecause mood inductions generally re
Page 29 and 30: (e.g. Conway et al., 1994). Memory
Page 31 and 32: alternatives (Lockhart, 2000). The
Page 33 and 34: equired participants to distinguish
Page 35 and 36: een found when memory is assessed b
Page 37 and 38: peripheral elements of emotional an
Page 39 and 40: processing of the specific content
Page 41 and 42: failure to retrieve episodic memori
Page 43 and 44: effects on cognitive processes, eve
Page 45 and 46: ecollection and familiarity within
Page 47 and 48: emotional influence on memory. In t
Page 49 and 50: year (Dolcos et al., 2005). There a
Page 51 and 52: e suitable for investigating memory
Page 53 and 54: possible that having to distinguish
Page 55 and 56: of photographs of people, animals a
Page 57 and 58: Retrieval phase: Participants then
Page 59: y the ANOVA’s. These are only rep
Page 62 and 63: Table 2.1: Experiments 1 and 2: Res
Page 64 and 65: In these experiments the influence
Page 66 and 67: We found evidence of recognition me
Page 68 and 69: For the recognition test, which was
Page 70 and 71: Section 5. Experiments 2A and 2B: P
Page 74 and 75: Section 7. Experiment 2E: Recogniti
Page 76 and 77: Table 2.2. Experiment 2: Results of
Page 78 and 79: For the ‘know’ responses the ma
Page 80 and 81: Section 8. Experiment 2 - General D
Page 82 and 83: Presentation of stimuli in blocked
Page 84 and 85: It is possible that the act of maki
Page 86 and 87: enhancement can be influenced by re
Page 88 and 89: levels of memory between the positi
Page 90 and 91: the performance of any subsequent t
Page 92 and 93: experiment to provide a set of targ
Page 94 and 95: Experimental stimuli were presented
Page 96 and 97: Recognition performance in all thre
Page 98 and 99: Analysis of RKG responses We analys
Page 100 and 101: Further signal detection analysis o
Page 102 and 103: stimuli, which corresponded with mo
Page 104 and 105: could be generalised to the real-wo
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
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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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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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