Jan 18 - Visual perception_ Physiology and Awareness .docx - PSYC 213 Cognition Jan 18 Visual perception Physiology and Awareness Last class Functional

Jan 18 - Visual perception_ Physiology and Awareness .docx...

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PSYC 213 Cognition Jan 18 - Visual perception: Physiology and Awareness Last class: Functional specialization: Different areas of the brain support different functions, The idea of localization / Modularity and phrenology Opposition to functional specialization: Franz and Lashley / Mental processes relate to activity of the brain as a whole, and not individual parts. The mind-brain link Interactionism: The mind and brain are separate entities that interact and influence each other. Epiphenomenalism: Mental events are caused by physical events. Parallelism: The mind and brain are two aspects of the same reality. Isomorphism: The correspondence between mind (consciousness) and the brain is Structural. Cognitive neuroscience methods Animal Models Human Psychophysiological Experiments Neuropsychology Cases: Split brain patients. Neuroimaging Techniques: EEG methods: Good temporal resolution / PET: Use of radioactive tracers to measure brain metabolism / fMRI: Good spatial resolution to measure brain activity / MEG: Temporal and spatial resolution, but the signal decay / Brain stimulation techniques: Temporarily impair/enhance brain function. Timing versus Location MEG/EEG – brain activity at the level of the millisecond PET/fMRI – brain activity at the level of the millimeter Brain stimulation Review: TMS is a procedure in which brain activity is influenced by a magnetic field, either increasing or decreasing the brain’s electrical signals. This results in behavioral changes. Related: Deep brain stimulation (DBS). Implant tiny electrodes in the brain to send an weak and constant electrical current to targeted regions of the brain / Reduces symptoms in cases like depression, Parkinson's / Mechanisms not known. This class: Perception Sensations and Perceptions. Physiology of Visual Perception: How information travels from the eyes to the brain. Perception with and without awareness: Conscious and unconscious processes. Visual Illusions: Visual perception is constructive and relies on assumptions. Sensation to perception Stimulus energy → Sensory receptors → Neural impulses --------------→ Brain → Sensations -------------------------------------------------------→ Perception ------→ Confusing the senses: Synaesthesia 1
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PSYC 213 Cognition Stimulation of one sense simultaneously produces another sensation in a different modality. For example: Grapheme-color synesthesia. Seeing certain numbers or letters as certain colors. McGurk Effect: Hearing Lips Speech sound /ba/ simultaneously presented with visual speech sound /fa/ heard as /fa/. A multisensory illusion: a change in auditory perception from visual input. Demonstrates two concepts: The integration of sensory information. *The power of visual input*: It overrides audio input!
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  • Winter '08
  • LEVITIN
  • visual field, late visual processing

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