Transcript Chapter 1
Chapter 1 Introduction Understanding human consciousness Mind-body question Dualism – the belief that the body is physical but the mind (soul) is not Monism – the belief that the world consists only of matter and energy and that the mind is a phenomenon produced by the workings of the nervous system Understanding human consciousness Blindsight Def: the ability of a person who cannot see objects in his or her blind field to accurately reach fro them while remaining unconscious of perceiving them Caused by damage to the “mammalian” visual system of the brain Suggests the common belief that perceptions must enter consciousness in order to affect our behavior is incorrect Understanding human consciousness Split brains Corpus callosum – the largest commissure of the brain, interconnecting the areas of neocortex on each side of the brain CC connects the 2 cerebral hemispheres (L and R) Epilepsy – split-brain operation Can detect olfactory stimuli on ipsilateral (same) side, but not on contralateral (opposite) side If split-brain patient is given olfactory stimulus (eg flower odor) to only right nostril, they will say they smell nothing (b/c right side cannot pass info onto left side which controls speech). However, even though they are not conscious of smelling it, they can then choose the correct object to stand for the stimulus (eg rose) Understanding human consciousness Unilateral neglect Def: a syndrome in which people ignore objects located toward their left and the left side of objects located anywhere Caused by damage to the right parietal lobe The Nature of Physiological Psychology The Goals of Research Generalization – a type of scientific explanation; a general conclusion based on many observations of similar phenomena e.g. man has fear of dogs because he was attacked as a child Reduction - a type of scientific explanation; a phenomenon is described in terms of the more elementary processes that underlie it e.g. the women feels hungry because her stomach is producing high levels of ghrelin The Nature of Physiological Psychology Biological Roots of Physio Psych Hippocrates On the Sacred Disease Descartes – organisms mere mechanical devices responding to env’t Reflex – an automatic, stereotyped movement that is produced as the direct result of a stimulus Model – a mathematical or physical analogy for a physiological process Müller Learn about nervous system only by experimentation Doctrine of specific nerve energies – because all nerve fibers carry the same message, sensory info must be specified by the particular nerve fibers that are active Experimental ablation – the function of a part of the brain is inferred by observing the behaviors an animal can no longer perform afterwards The Nature of Physiological Psychology Broca Stroke in left side of brain (later named “Broca’s area”) left patient with inability to speak Helmholtz Measured speed of electronic conduction by nerves; saw that more than just a simple message being transmitted Natural Selection and Evolution Darwin All of an organism’s characteristics serve a functional purpose Functionalism – the principle that the best way to understand a biological phenomenon is to try to understand its useful functions for the organism Natural selection – the process by which inherited traits that confer a selective advantage become more prevalent in a population Mutation – change in the genetic info that can be passed on to an organism’s offspring; provides genetic variability May also provide a selective advantage Evolution of the Human Species Evolution – a gradual change in the structure and physiology of plant and animal species – generally producing more complex organisms – as a result of natural selection Evolution of the Human Species Evolution of Large Brains Humans evolved into beings capable of many complex behaviors and cognitions Requires a larger brain Neoteny – a slowing of the process of maturation, allowing more time for growth Ethical Issues in Research with Animals Humane and Worthwhile Compare numbers of animals used in research vs those used for food/hunting/unwanted pets/clothing etc. Researchers care about their animals! Careers in Neuroscience Physiological psychologist – a scientist who studies the physiology of behavior, primarily by performing physiological and behavioral experiments with lab animals Professor at University (teaching and running a research lab) Private or public research institutions Society for Neuroscience – www.sfn.org HW for next class Read Chapter 2: Structure and Function of Cells of the Nervous System Suggest reviewing today’s lecture