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Section 3.1. Introduction Section 3. Experiment 9 Experiment 8 did not support associative binding or implicit memory as underlying the observed memory differences. Therefore, we will now consider whether the distinctiveness of emotional stimuli may contribute towards these effects. As discussed in the introduction to this chapter, distinctiveness of emotional stimuli has been argued to play an important role in the emotional enhancement of memory (e.g. Talmi et al., 2007). This possibility is explored in this experiment by blocking the presentation of stimuli into lists containing stimuli of one type of emotion. In line with previous research in this area we predict that the presentation of stimuli in blocks of emotion will eradicate the emotional enhancement of both specific and general recognition. We also predict that the attention focusing seen onto negative objects in a scene in Experiment 7 will be eradicated. Section 3.2. Method Design A within-participants blocked list design was used with scenes of a neutral background and a negative, neutral or positive object to examine the role of distinctiveness in the emotional enhancement of visual memory specificity. Eye movement measurements will also be recorded to examine the influence of distinctiveness on the distribution of visual attention whilst participants are encoding the scenes. 209
Participants 18 participants (12 female) took part in this experiment. All were native English speaking University of <strong>Nottingham</strong> students (mean age = 19.39 years, SD = 1.38). Informed consent was obtained from all participants. Participants received an inconvenience allowance of £3 for their voluntary participation. Materials Procedure The same materials were used as in experiment 7. Study All aspects of the experiment were identical to those of experiment 7, apart from the following adaptations to allow for the presentation of stimuli in blocked lists. After participants had been shown the example stimuli and eye calibration was complete participants were presented with additional instructions. There was an interval of 20 seconds before the first block of stimuli were shown, during this time participants were told they would be shown 16 pictures which were mostly unpleasant (if the first block was negative). In order to increase the anticipation participants might feel about the upcoming negative block of stimuli it was emphasized that if they feel upset by these pictures they are free to withdraw from the experiment at any stage. After the 20 second interval participants were presented with 16 experimental stimuli of neutral backgrounds with a negative object for 2 seconds each. A central fixation was shown for 1 second before and after each stimulus. After each picture participants completed the encoding task indicating whether they would like to move closer or further away from the scene. The second block of stimuli 210
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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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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
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
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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
Page 234 and 235: component (object, background) inte
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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
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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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