Hakan Sahin

Hakan Sahin

Psychology PhD Research Student , MSc Clinical Neuroscience (Distinction) , MBPsS, BSc Psychology and Counselling degree (First Class)


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Personal profile

Research interests

Intrusive memories of trauma, Flash backs, PTSD, Psychotic disorders: schizophrenia, bipolar, and anxiety and depression 

Research projects

I am curently working on my psychology PhD research project on PTSD intrusive memories under the supervision of Dr Marco Sandrini as my Directory of Studies. 

Traumatic events can be re-experienced as involuntary, intrusive and distressing mental images, a core feature of patients with Post Traumatic Stress Disorder (PTSD). Neuroimaging studies have shown brain activations in the primary visual cortex and left inferior frontal cortex (IFC) during the formation of intrusive memories. These brain regions are involved in visual processing and suppression of emotional responses, respectively. Existing maladaptive memories can be reduced by a manipulation applied after their reactivation by a reminder cue.

Here, we will investigate the contribution of the visual cortex and the left IFC in reducing intrusive memories using a safe, inhibitory non-invasive brain stimulation technique (i.e Transcranial Magnetic Stimulation, TMS) in healthy adults. Participants will be asked to record the intrusive memories temporarily induced by viewing a trauma-film for a 7-day period. Participants’ memory of the film will be reactivated by a brief reminder 1 day following the film viewing. Subsequently, inhibitory NIBS will be applied to primary visual cortex, left IFG and a control site. Electroencephalogram (EEG) at rest and during a working memory capacity task will be recorded before the intervention to predict the strength of the intrusive memories.

This research will shed light on the brain mechanisms of this novel intervention that has the potential to be applied in patients with PTSD. 



I am a British citizen from Turkey, and I have been living in London since 2001. In 2007, I passed my University of Cambridge Proficiency (CPE) exam and gained CELTA (Certificate in Teaching English to Speakers of Other Languages) certificate. I have a first-class honours degree in BSc Psychology and Counselling and distinction in MSc Clinical Neuroscience master’s degree from University of Roehampton. Currently I am a research student doing my Psychology PhD on the Post Traumatic Stress Disorder (PTSD) intrusive memories. I have been working for Huntercombe Hospital Roehampton since March 2020 as a healthcare support worker. Also, in mental health care setting, I volunteered with Maytree, a charity provides therapeutic space and the face-to-face counselling opportunity for people with suicidal ideation and self-harm issues, and currently I am working as a volunteer counsellor in West London Counselling Centre since September 2021.

In adition, I worked in a number of research projects. My undergraduate project was with my current Directory of Studies (DoS)  Dr Marco Sandrini; ''Investigating the causal role of dorsolateral prefrontal cortex in episodic memory retrieval using transcranial direct currant stimulation.'' 

My master thesis was under supervision of Dr Simon Dyall: ''Investigating the effects of a high fish oil DHA multinutrient supplementation on the outcome measures of omega-3 PUFAs DHA and EPA and EPA:AA ratios’ predictability and improvement of the cognitive functions and health related emotional well-being scores in healthy older women.''





University of Roehampton -Psychology PhD  Sep 2021 to Present

Research topic: Intrusive Memories of Trauma, PTSD

University of Roehampton – Distinction in MSc Clinical Neuroscience 2021

Recognised by the Federation of Neuroscience Societies (FENS)

University of Roehampton - BSc First-Class (Hons) Degree 2020          

BPS accredited BSc Psychology and Counselling degree              

South Thames College - CELTA  2007

Certificate in Teaching English to Speakers of Other Languages

Professional affiliations

The British Psychological Society active member 

The Graduate Basis for Chartered Membership (GBC) (MNum.: 531608)

Notable Achievements

Effects of transcranial electrical stimulation on episodic memory in physiological and pathological ageing

Marco Sandrini Rosa Manenti Hakan Sahin Maria Cotelli : PMID: 32275953, DOI: 10.1016/j.arr.2020.101065


  • BF Psychology
  • Intrusive memories of trauma
  • Flash backs
  • PTSD
  • Psychotic disorders: schizophrenia, bipolar
  • Depression
  • Anxiety
  • Neuroscience
  • Cognitive Neuroscience
  • Mental Health


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