Fig 1.
Lateralized visual processing in standard and dichoptic viewing.
In standard binocular viewing (left side), targets in the left visual field (green) are projected onto the right hemiretina (nasal or temporal) of both eyes and processed in the right hemisphere. Targets in the right hemifield (orange) are similarly processed in the left hemisphere. Each hemisphere, therefore, receives information from both eyes via ipsilateral and contralateral connections. Under dichoptic viewing (right side), targets in the temporal hemifield of an eye (green) are projected onto the nasal hemiretina of that eye and processed in the contralateral hemisphere and targets in the nasal hemifield (orange) are projected onto the temporal hemiretina and processed in the ipsilateral hemisphere. Lateralized targets in a dichoptic viewing task are thus processed in one hemisphere only, which may change the typical course of visual processing.
Fig 2.
Schematic illustration of a trial.
(a) The trial starts with a fixation cross presented to both eyes. The subject initiates the actual trial with a key press. (b) Dynamic Mondrian noise is presented to one of the eyes. (c-d) The target is presented to the other eye, and its contrast is gradually ramped up. The target remains until the subject’s response. When sound is included, a high or low pitch tone is provided for 400 ms after target onset.
Fig 3.
Effects of location and sound cue on the detection of suppressed visual targets.
Mean b-CFS RTs for targets presented at four display quadrants when associated with high pitch tone, low pitch tone, or presented without a sound. Error bars represent the standard errors of the mean. * p < .05, ** p < .01, *** p < .001.
Fig 4.
Location x eye interaction in the detection of suppressed visual targets.
Mean b-CFS RTs for targets at four display locations in the left and right eye. Error bars represent the standard errors of the mean. ** p < .01, *** p < .001.
Fig 5.
Sound-associated learning in the b-CFS task.
Mean b-CFS RTs for three stimulus blocks (in order of presentation). Visual targets were combined with auditory tones in two of the blocks (open squares) and presented without sounds in one block (filled circles). The blocks were carried out in one of two orders so that the no-sound block was either the first block (solid line, n = 15) or last block (dashed line; n = 15) of the sequence. The presence of sounds was associated with an increased learning rate during the course of the experiment.