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Clinical Science Brown Bag Series
September 2, 2014

NO SPEAKER SCHEDULED THIS DATE

AN INFORMAL MEETING WITH CLINICAL GRADUATE STUDENTS WILL BE HELD

12:10 p.m. Room 316, Wilson Hall


World on Wednesday: Biomedical Research Internships in Asia, Europe, and the United States
September 3, 2014

International Student and Scholar Services would like you to join us at WOW, where Vanderbilt & the community engage in presentations, informal conversations, and topical lectures on global issues. Lunch will be provided.


CCN Brown Bag Series: Sean Polyn
September 3, 2014

The Cognition and Cognitive Neuroscience (CCN) program presents Sean Polyn, Department of PsychologyVanderbilt University

12:10 p.m. Room 115, Wilson Hall

Neural activity in the medial temporal lobe revealing the fidelity of mental time travel

Neural circuitry in the medial temporal lobe (MTL) is critically involved in retrieving the details of past experience. Different neuroscientific theories propose that the MTL supports memory of the past by successfully retrieving previously encoded episodic information, as well as by reactivating a temporal code specifying the position of a particular event within the episode. However, the computational mechanisms supporting these abilities are underspecified. To test the computations supported by MTL subregions that are sufficient to facilitate mental time travel, we developed a computational model that linked blood oxygen level-dependent (BOLD) signal to cognitive operations, allowing us to predict human performance in a memory search task. Under this model, signal from parahippocampal cortex signals how strongly one reactivates the context of a retrieved memory, allowing the model to predict whether the next memory will correspond to a nearby moment in the study episode. Signal from perirhinal cortex, in contrast, indicates the successful retrieval of item information, allowing the model to predict whether the participant will continue to report remembered materials. Hippocampal signal reflects both processes, consistent with theories that this region binds item and context information together to form episodic memories. These findings are consistent with modern theories describing complementary roles for the hippocampus and surrounding parahippocampal and perirhinal cortices during the retrieval of episodic memories, shaping how humans revisit the past.

 


Neuroscience Seminar: Antonia Thelen
September 4, 2014

Antonia Thelen, Vanderbilt Brain Institute (Wallace Lab), Vanderbilt School of Medicine

12:10 p.m. Room 316, Wilson Hall

Title and abstract TBA


Clinical Science Brown Bag Series: Matt Morris
September 9, 2014

Matt Morris, Meharry Medical College

12:10 p.m. Room 316, Wilson Hall

Title and abstract TBA


CCN Brown Bag Series: Joe Lappin
September 10, 2014

The Cognition and Cognitive Neuroscience (CCN) program presents Joe Lappin, Department of Psychology, Vanderbilt University

12:10 p.m. Room 115, Wilson Hall

Divided Attention to Motion: Detection Proportional to the Spread of Attention

How do visual detection and resolution of moving objects depend on the
number of objects to which an observer attends? Well-trained observers monitored ongoing patterns of randomly moving objects, trying to quickly detect non-random target motions by any one of the objects. Two experiments studied effects of the number of attended objects on the process of motion
detection.

Conditional detection speeds for targets not yet detected (hazard rates) were inversely
proportional to the number of attended objects, for sets of 1 – 12 moving objects. When motion speeds were varied, detection was found to depend on both spatial and temporal lengths of motion; and detection was invariant with motion speed when the length of motion was measured in space-time. The detection process had two phases — with hazard rates initially increasing and then constant. These two phases in space-time were largely independent of set size and response time, but hazard rates were inversely proportional to set size in both phases.

Thus, spatiotemporal resolution was diluted in proportion to the spread of attention, with a
constant capacity divided among the attended objects.

 

 


Neuroscience Seminar: Rankin McGugin
September 11, 2014

Rankin McGugin, Department of Psychology (Gauthier Lab), Vanderbilt University

12:10 p.m. Room 316. Wilson Hall

Title and abstract TBA


Clinical Science Brown Bag Series: Emma Finan
September 16, 2014

Emma Finan, Psychiatric Hospital at Vanderbilt

12:10 p.m. Room 316, Wilson Hall

Title and abstract TBA


Department of Psychology Special Seminar: Frederick Verbguggen
September 16, 2014

2014 Randolph Blake Early Career Award Winner

Frederick Verbguggen, Ph.D., Professor of Cognitive Psychology, University of Exeter

4:1O p.m. 115 Wilson Hall

Banishing the control homunculi in studies of action control and behaviour change

 

For centuries, human self-control has fascinated scientists and nonscientists alike. Current theories often attribute it to an executive control system. But even though executive control receives a great deal of attention across disciplines, most aspects of it are still poorly understood. Many theories rely on an ill-defined set of ‘homunculi’ doing jobs like 'response inhibition' or ‘updating’ without explaining how they do so. Furthermore, it is not always appreciated that control takes place across different time-scales. These two issues hamper major advances. In this presentation, I will focus on the mechanistic basis for the executive control of actions, and stopping in particular. I propose an integrated account of action control that includes the processes of attentional selection, action selection, and action execution. These processes are modulated via error-correction or outcome-evaluation mechanisms, preparation, and task rules maintained in working- and long-term memory. I will also consider how executive control of actions becomes automatised with practice. Finally, I will discuss how the application of this unified framework in clinical domains can increase our understanding of control deficits and provide a theoretical basis for the development of novel ‘behavioural change’ interventions. 

 


CCN Brown Bag Series: Philip Smith
September 17, 2014

The Cognition and Cognitive Neuroscience (CCN) program presents Philip Smith

Wed. 9/17/14

12:10 p.m. Room 115, Wilson Hall

Title and abstract TBA


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