Visual representations can also be activated via top down processes without external stimulation: visual imagery - PFC - IT - V4 - V1/V2 (signals from prefrontal cortex lead to reactivation of cortical patterns all way down to V1/V2)
2 of 7
Ganis et al, (2004) difference in perception vs imagery
Coronal slices -showed no difference in activation between PFC (92% over lap), more posterior acitvation from perception than imagery e.g. V1
3 of 7
V1 and visual imagery?
V1 closest to enviornment - is V1 casually related to mental imagery or is it epipenomenal? TMS studies
4 of 7
TMS - virtual lesion study (Transcranial magnetic stimulation) generated by coil
Provides links between neural acitvity and behaviour, effects can be controlled by varying magnitude and timing of stimulation
5 of 7
Are Visual images depetivite?
Yes neural representation on v1
6 of 7
Hemianopia
blindness for half of visual field
7 of 7
Other cards in this set
Card 2
Front
Top down processing
Back
Visual representations can also be activated via top down processes without external stimulation: visual imagery - PFC - IT - V4 - V1/V2 (signals from prefrontal cortex lead to reactivation of cortical patterns all way down to V1/V2)
Card 3
Front
Ganis et al, (2004) difference in perception vs imagery
Back
Card 4
Front
V1 and visual imagery?
Back
Card 5
Front
TMS - virtual lesion study (Transcranial magnetic stimulation) generated by coil
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