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Bassil psyc 202 unconscious perception unconscious

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Unformatted text preview: exible) M. Bassil PSYC 202 Unconscious Perception Unconscious Perception & Influence Stimuli can be perceived without cons awareness Visual Agnosia: inability to visually recognize inability objects (their size, shape, or orientation) (their e.g. can do card-insertion task & avoid obstacles insertion while walking ► info processing at unconscious info level level Prosopagnosia: A type type of VA whereby patients can visually recognize objects but not faces (even their own) ► EEG recorded different patterns of brain activity EEG when patients look at familiar faces vs. unfamiliar faces faces M. Bassil PSYC 202 4 Create PDF files without this message by purchasing novaPDF printer (http://www.novapdf.com) 11/4/2009 Unconscious Perception Unconscious Perception & Influence (1) Blindsight: blind in part of their visual field yet in blind special special tests respond to stimuli in that field Left-hemisphere damage see nothing in right field but can hemisphere see guess guess Priming: exposure to stimulus influences (primes) exposure how you subsequently respond to that same or another another stimulus. Subliminal Subliminal stimulus (below threshold) (e.g. complete word stems) stems) Positive Positive evaluation influenced by exposure to pleasant images/words images/words M. Bassil PSYC 202 Unconscious Perception Unconscious Perception & Influence (2) The Emotional Unconscious: unconscious unconscious emotional & motivational processes processes influence behavior Amnesia Amnesia patient pricked her hand upon hand shake shake withdrew next time (unconscious memory) Guess Guess which brain structure is responsible for this memory? memory? Subliminal Subliminal exposure to nouns ranging from strongly negative to positive affected mood mood is influenced by environment M. Bassil PSYC 202 5 Create PDF files without this message by purchasing novaPDF printer (http://www.novapdf.com) 11/4/2009 Why Do We Have Consciousness? Evolution Evolution gave rise to species with subjective feelings survival advantage (ability to plan, reflect on & choose actions) Consciousness Consciousness summarizes presence of numerous external & internal stimuli single mental representation is distributed single to to brain regions involved in planning & decision-making Lack of self-awareness can’t override dangerous behavior awareness can’t of of impulses/automatic processing (lash out when provoked) Unconscious Unconscious processing poorly equipped to deal with novelty & learning new tasks. Self-awareness & communication learning awareness express needs & coordinate actions with others M. Bassil PSYC 202 Neural Basis of Consciousness How does brain activity produce consciousness? 1. 2. Studies Studies using brain imaging, electrical stimulation & patients with with brain-damage found multiple brain neural pathways for damage neural for information processing Example: Example: for visual information: Visual cortex to parietal lobe unconscious guidance for action Visual cortex to temporal lobe conscious recognition (perception) Both carry information to prefrontal cortex Masking procedure: angry face (30ms) + neutral face angry (45ms) presentation (45ms)presentation of 2 nd photo masks conscious nd photo st, perception perception of 1st, then brain activity is assessed differs depending on whether same threatening stimuli are differs consciously consciously or unconscio...
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