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When and why are two emotional experiences similar to each other? Exploring the cognitive and neural mechanisms that underlie judgements of similarity between emotional experiences

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  • Full or part time
    Dr G Pobric
    Dr D Talmi
  • Application Deadline
    No more applications being accepted
  • Competition Funded PhD Project (European/UK Students Only)
    Competition Funded PhD Project (European/UK Students Only)

Project Description

Much of the meaning we extract from our experiences stems from their similarity to other experiences we have. Yet the experiences that we care most about are emotional experiences, such as winning a competition, succeeding in an exam, and passing an interview, or, by contrast, experiences of losing and failing. It is not known whether the mechanisms people use to judge the similarity between neutral stimuli apply for judgements of similarity between emotional stimuli. In fact, there are reasons to believe that people judge two emotional stimuli to be ‘similar’ even when they are quite different from each other, as long as they invoke the same feelings in us. For example, an image of a slumped drug addict in the streets of Tel-Aviv and an image of a child eating her dinner will be considered ‘different’ because they appear to have a very different (semantic) meaning. By contrast, the same image of an addict and an image of a starving Yemeni child may be evaluated as highly similar because they invoke similar negative feelings. This means that similarity judgments between two emotional stimuli may be based not only on semantic similarity, but also on ‘emotional similarity’. Importantly, recent studies have shown that over-generalization of the similarity between emotional experience is a key contributor to anxiety and PTSD, yet this work have mainly focused on the similarities between stimuli that lead to abnormal responses.

This project will explore the cognitive and neural mechanisms that underlie judgements of similarity between emotional experiences, a topic which has so far been neglected. We will : a) identify how the characteristics of emotional experiences inform their similarity metrics; b) unveil the underlying brain regions and mechanisms that contribute to judgements of similarity in emotional conditions; c) describe the changes in brain representations that occur during learning and maintenance and how they lead to later similarity judgement between emotional memories; d) explore the contribution of these mechanisms in post-traumatic-stress.
This multidisciplinary research project on emotional similarity seamlessly converges research interests and methodological expertise of the supervisory team. The student will be immersed in vibrant research groups (both in Manchester and Weizmann) and trained in: behavioural, imaging (fMRI ) and neurostimulation (TMS) methods.

Funding Notes

This is a fully-funded studentship in conjunction with the Weizmann Institute of Science, Israel covering fees and stipend for 4 years.

Applicants must be from within the UK/EU and hold, or be about to obtain, at least an upper second class honour degree in a related subject area.

Applications should be submitted online, for more information about the programme, key dates and how to apply see our website

References

Schechtman E, Laufer O, Paz R. Negative valence widens generalization of learning. J Neurosci. 2010 Aug 4;30(31):10460-4. doi:10.1523/JNEUROSCI.2377-10.2010
Resnik J, Sobel N, Paz R. Auditory aversive learning increases discrimination thresholds. Nat Neurosci. 2011 Jun;14(6):791-6. doi: 10.1038/nn.2802.
Laufer O, Paz R. Monetary loss alters perceptual thresholds and compromises future decisions via amygdala and prefrontal networks. J Neurosci. 2012 May 2;32(18):6304-11. doi: 10.1523/JNEUROSCI.6281-11.2012.
Resnik J, Paz R. Fear generalization in the primate amygdala. Nat Neurosci. 2015 Feb;18(2):188-90. doi: 10.1038/nn.3900.
Laufer O, Israeli D, Paz R. Behavioral and Neural Mechanisms of Overgeneralization in Anxiety. Curr Biol. 2016 Mar 21;26(6):713-22. doi: 10.1016/j.cub.2016.01.023.
Pobric G, Lambon Ralph MA, Zahn R. Hemispheric Specialization within the Superior Anterior Temporal Cortex for Social and Nonsocial Concepts. J Cogn Neurosci. 2016 Mar;28(3):351-60. doi: 10.1162/jocn_a_00902.
Pobric G, Jefferies E, Lambon Ralph MA. Category-specific versus category-general semantic impairment induced by transcranial magnetic stimulation. Curr Biol. 2010 May 25;20(10):964-8. doi: 10.1016/j.cub.2010.03.070.
Pobric G, Jefferies E, Ralph MA. Anterior temporal lobes mediate semantic representation: mimicking semantic dementia by using rTMS in normal participants. Proc Natl Acad Sci U S A. 2007 Dec 11;104(50):20137-41. PubMed PMID: 18056637.
Talmi D, Moscovitch M. Can semantic relatedness explain the enhancement of memory for emotional words? Mem Cognit. 2004 Jul;32(5):742-51.
Talmi, D. (2013). Enhanced Emotional Memory: Cognitive and Neural Mechanisms. Current Directions in psychological Science, 22, 430-436.
Ramdeen, K.T., Davidson, P., Hot, P., & Talmi, D. (in press). How Emotional Arousal Enhances Episodic Memory. Chapter to be published in: Cognitive Psyhcology of Memory, edited by J. Wixted, a volume in Learning and Memory: A Comprehensive Reference, edited by J. Byrne.

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