Left Brain / Right Brain: Entering the Debate on Cerebral Asymmetry Paul Greenberg, 2015 Anoka Ramsey Community College.

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Presentation transcript:

Left Brain / Right Brain: Entering the Debate on Cerebral Asymmetry Paul Greenberg, 2015 Anoka Ramsey Community College

The Left vs. Right Controversy No, the other controversy. – nt/11/9/868.full (Watkins et.al, 2001) nt/11/9/868.full How different are different parts of the brain?

Presentation Goals Approach the Cerebral Asymmetry Debate – What is a brain/cortex? – Main issues History of debate Structural evidence Functional evidence How methods matter Popular vs. Scientific usage

Selective Origins of Cerebral Asymmetry 225 Years of Inquiry Phrenology (less correct) – Franz Gall & Johann. Spurzheim, – Skull features show functional localization (1/2 wrong) Functional localization (more correct) – Brain damage shows functional localization – Paul Broca 1860s (speech) – Carl Wernicke 1870s (listening) – Supports Funct. Loc. And C. A.

Structural Asymmetry Premise: structural asymmetry predicts functional asymmetry Famous discoveries – Visual System is Crossed – Motor System is Crossed (and Handedness) – R. Sperry (Split Brain) – Gray Matter Volume: More in Right frontal lobe More in Left occipital lobe Asymmetry exists

Functional Asymmetry / Dominance Left Language (speech, grammar, syntax) Positive Emotion Narrow Focused Attention Tools & Machines Right Language (rhythm, sound) Negative Emotion, Reading Emotion Global Vigilant Awareness, Spatial Coordinates Metaphor, Context, Implicit Meaning, Living Objects Argued RH for general emotion, or divided emotion Creativity, Personality Types - Popular Myths Role in Pathology, Indiv Differences RH Prosocial LH Antisocial

Methods Neuropsychology – Brain Damage – Cognitive Testing Neurosurgery (Sperry) – Split Brain Imaging, Electrophysiology, cellular/molecular, neuroanatomy and more

Conclusion Cerebral asymmetry well established – Structural – Functional Varying methods and interpretations – Relation to psychopathology Popular over- generalizations are prevalent – Keep Reading! Iain McGilchrist

References Demaree, H. a, Everhart, D. E., Youngstrom, E. a, & Harrison, D. W. (2005). Brain lateralization of emotional processing: historical roots and a future incorporating “dominance”. Behavioral and Cognitive Neuroscience Reviews, 4(1), 3–20. Fitzakerley, J. (2015, January 1). Lateralization of Cortical Function. Retrieved March 27, Hecht D (2014). Cerebral lateralization of pro- and anti-social tendencies. Experimental Neurobiology, 23(1):1-27 Hervé, P.-Y., Zago, L., Petit, L., Mazoyer, B., & Tzourio-Mazoyer, N. (2013). Revisiting human hemispheric specialization with neuroimaging. Trends in Cognitive Sciences, 17(2), 69–80. Kolb, B., & Whishaw, I. Q. (2009). Fundamentals of human neuropsychology. New York, NY: Worth Publishers. Nielsen, J. a, Zielinski, B. a, Ferguson, M. a, Lainhart, J. E., & Anderson, J. S. (2013). An evaluation of the left-brain vs. right-brain hypothesis with resting state functional connectivity magnetic resonance imaging. PloS One, 8(8), e Van Whye, J. (1999, January 1). What did phrenologists actually do? Retrieved March 27, Watkins, K. (2001). Structural Asymmetries in the Human Brain: A Voxel-based Statistical Analysis of 142 MRI Scans. Cerebral Cortex, 11(9),

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