Search results for "muutossokeus"
showing 4 items of 4 documents
Implicit binding of facial features during change blindness
2014
Change blindness refers to the inability to detect visual changes if introduced together with an eye-movement, blink, flash of light, or with distracting stimuli. Evidence of implicit detection of changed visual features during change blindness has been reported in a number of studies using both behavioral and neurophysiological measurements. However, it is not known whether implicit detection occurs only at the level of single features or whether complex organizations of features can be implicitly detected as well. We tested this in adult humans using intact and scrambled versions of schematic faces as stimuli in a change blindness paradigm while recording event-related potentials (ERPs). …
Vaikuttaako emotionaalinen taustamusiikki vihaisten kasvoilmemuutosten esitietoiseen tiedonkäsittelyyn muutossokeusparadigmassa?
2011
Uhkaavat tai vihaiset ärsykkeet havaitaan neutraaleja ja muita emotionaalisia ärsykkeitä tehokkaammin, mikä johtunee tietoisuutta edeltävistä esitietoisista havaintoprosesseista. Usein ympäristön viestit toisaalta havaitaan eri aisti-informaatioita yhdistellen aistipiirien välisen (engl. cross-modal) tiedonkäsittelyn myötä, jolloin nähdyn (emotionaaliseen) käsittelyyn voisi vaikuttaa esimerkiksi samalla kuultu taustamusiikki. Tämän tutkimuksen tarkoituksena oli selvittää uhkan esitietoisen prosessoinnin mahdollisuutta sekä emotionaalisen taustamusiikin roolia visuaalisten uhkaärsykkeiden tiedonkäsittelyssä. Tätä tutkittiin muutossokeusparadigmalla, jossa esitettiin nopeita neutraalista viha…
Explicit behavioral detection of visual changes develops without their implicit neurophysiological detectability
2012
Change blindness is a failure of reporting major changes across consecutive images if separated, e.g., by a brief blank interval. Successful change detection across interrupts requires focal attention to the changes. However, findings of implicit detection of visual changes during change blindness have raised the question of whether the implicit mode is necessary for development of the explicit mode. To this end, we recorded the visual mismatch negativity (vMMN) of the event-related potentials (ERPs) of the brain, an index of implicit pre-attentive visual change detection, in adult humans performing an oddball-variant of change blindness flicker task. Images of 500 ms in duration were prese…
Event-related potentials reveal rapid registration of features of infrequent changes during change blindness
2010
Background. Change blindness refers to a failure to detect changes between consecutively presented images separated by, for example, a brief blank screen. As an explanation of change blindness, it has been suggested that our representations of the environment are sparse outside focal attention and even that changed features may not be represented at all. In order to find electrophysiological evidence of neural representations of changed features during change blindness, we recorded event-related potentials (ERPs) in adults in an oddball variant of the change blindness flicker paradigm. Methods. ERPs were recorded when subjects performed a change detection task in which the modified images w…