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greatly diminish or disappear with mixed lists of neutral and concern-related stimuli (Waters & Feyerabend, 2000). It has been argued that there may be carry-over effects in the blocked Stroop task where participants ruminate about previous words as they continue to colour-name target items later in the sequence. These carry-over effects in blocks with concern-related words may increase the size of the Stroop effect in blocked versions of the stroop (see Waters et al., 2003). Waters et al (2003) demonstrated carry-over effects in a Stroop task with smokers where the concern-related words were about smoking. An alternative interpretation of this emotional Stroop effect is that emotional words automatically attract attention, distracting the participant from the colour-naming task and therefore increasing the time required to name the colour of the emotional words, relative to the neutral words. McKenna & Sharma (2004) used a Stroop-like task to investigate the intrusion of emotion on cognitive processing. They investigated a fast interference effect described as interference of emotion with the response within the trial of a threatening stimulus (the theory that emotional words automatically attract attention which is proposed by many authors in this area) and a slow interference effect described as the interference of emotion with stimuli presented after the threatening stimulus. They found evidence for a slow effect which lasted for one subsequent trial, but no evidence for a fast interference effect. They discussed several possible mechanisms which might explain the pattern of disruption found from negative emotional stimuli. McKenna & Sharma (2004) firstly discounted the theory that mood inductions across stimuli may explain the effects, one reason given was that the disruption effects observed lasted for 187
less than one second, whereas mood induction normally takes many seconds to develop. They suggest that the slow effects they found may be interpreted as negative stimuli preventing the disengagement of attention or that interference may result from preparation to respond to a threat which may be demonstrated through interference to a subsequent stimulus. In the experimental design used here it will not be possible to assess the interference from a slow effect of emotional disruption as an interstimulus interval of no more than 32 milliseconds was found to be necessary (McKenna & Sharma, 2004) for these effects to occur. In the paradigm used there is at least 2 seconds between each stimulus presentation as a result of the fixation crosses shown before and after each stimulus. Increasing the intertrial trial interval has been shown to reduce the interference from negative stimuli and intervals of 1 second were found to produce a disruption of only 11 milliseconds (Sharma & McKenna, 2001). This suggests that any slow effects of interference are unlikely to have any impact on the experimental design here. It is possible that the fast effects of interference from emotional disruption within a trial may be a contributory factor to the lack of memory for peripheral details of negative emotional stimuli. It has been proposed that these interference effects in the emotional stroop are due to the automatic attention grabbing of emotional stimuli which leads to a reduced response time to the task (e.g. Williams et al, 1997). It is possible that there is automatic grabbing of attention by the negative objects in a scene which then interferes with the processing of the backgrounds of these stimuli, leading to impaired memory for these peripheral details. 188
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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
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
Page 148 and 149: memory for positive stimuli. These
Page 150 and 151: whether visual specificity for posi
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
Page 168 and 169: of one second was displayed before
Page 170 and 171: Table 4.3. Mean responses (SE) for
Page 172 and 173: greater recognition for the objects
Page 174 and 175: Table 4.4. Mean average (SE) number
Page 176 and 177: eveal a significantly longer total
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 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 194 and 195: Factors unrelated to intrinsic emot
Page 196 and 197: faces or places (Puri & Wojciulik,
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
Page 212 and 213: the background when presented later
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
Page 222 and 223: object in a scene. There was no sig
Page 224 and 225: eradication of any emotional enhanc
Page 226 and 227: possible that the emotional stimuli
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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
Page 236 and 237: ackground of the scene. There was n
Page 238 and 239: Section 3.4. Discussion There was e
Page 240 and 241: 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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