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PSYC55H3 (34)
Andy Lee (27)

psyc55- lec 9.docx

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Andy Lee

Frontal lobes: Working memory  Search task- every single well has food under- monkey uncover the well and take food-if the monkey returns to the wall that they have already been to- if its empty counted as an error  Control monkey with no lesions  Increase the number of trials-monkeys with lesions to sulcus principals and superior pfc do worse on the task  Area 46 is important in monkey has to hold info in short term memory  Electrophysiology- delay response task-give cue, delay, and go period  Sulcus principal- fires the most during the delay period  Monkeys fixate on the centre of the screen- square flash off somewhere on the screen, delay phase which cue disappears, response phase- make a response to where the cue will appear or to the opposite side  Dorsalateral prefrontal cortex- cell fire significantly during the delay period  During the error period- activity low compare to if they get it right  Goldman – rakic- prefrontal cortex is responsible for the temporary maintenance of memory  On the prefrontal cortex- large majority of papers have focused on this area  Human studies- Owert- touch screen- this task is an analogue of potassium 1959 task  Search for tokens in the different locations- aim was to retrieve the tokens from all locations- error if empty space revisited  People with frontal lobe damages- did the most errors- greater the error when the spaces were increased  Leung- subjects fixate on the cross- after fixation see a series of dots in different locations- ask to remember- yes/no to the spatial location asked  Control location- instructed to not remember anything  Transverse- memory condition compare to control condition significant activity in prefrontal cortex- Ba 46- during delay period u see significantly more activity in dorsalateral prefrontal cortex compare to control condition  Conclusion- prefrontal cortex is critical for working memory  If it is important does different parts contribute to working memory differently  Working theory is organized on the basis of content- (e.g visual info, spatial, auditory)  Working memory is organized according to the type of info u remember  Prefrontal cortex is split up according to content  Process based theory- what is important is the actual type of processing carried out  Content based-phonological loops in left hemisphere and visuospatial in right hemisphere  Phonological memory- left prefrontal cortex active- more evidence  Visuospatial- right prefrontal cortex- less evidence  Content based account- Goldman- specialization of working memory has to be considered between dorsal p
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