Trivia Facts And Questions On Mechanisms Of Visual Attention! Quiz

Increasing sensitivity to certain stimuli means that a person becomes more responsive and reactive to those specific stimuli. This could be due to heightened awareness or a heightened physiological response. On the other hand, decreasing sensitivity to other information means that a person becomes less responsive or less reactive to other types of information or stimuli. This could be due to habituation or desensitization, where repeated exposure to certain stimuli leads to a decreased response over time.

Patients with visual neglect who had damage in the right parietal lobe will tend not to pay attention to the left side. This is because the right parietal lobe is responsible for processing and integrating information from the left side of the body and the left side of the visual field. Damage to this area can result in a condition called visual neglect, where individuals have difficulty attending to and perceiving stimuli on the opposite side of the damage. In this case, damage to the right parietal lobe leads to a lack of attention towards the left side.

When the H value is positive, it means that the angle on the nasal retina (the side closest to the nose) is larger than the corresponding temporal angle (the side towards the temple) on the other eye. This is because the H value represents the horizontal disparity between the two eyes, indicating the difference in the visual angle between the two retinas. Therefore, the statement is true.

If a normal corresponding system is stimulated with two different targets for the two foveas, the confusion caused by this stimulation will result in both foveas perceiving the targets at the same point in space. This suggests that the statement is true.

In vision training what you’re doing is strengthening the vergence system. You would expect to go from a steeper curve to a flatter curve if you did that type of training because your vergence system would adjust to prism without changing FD.

All of the statements regarding visual attention are true. Visual attention refers to the amount of visual information that we process. Paying close attention to one task can lead to a loss of attention to other tasks. Visual search procedures, which involve finding a target among distractions, are a clinical assessment of visual attention.

Correspondence is a cortical phenomenon. It’s not based on the retina. It’s a cortical issue. The cortex puts it together. It says no it’s coming from the same direction in space and they’re superimposed. So you have two different objects that are superimposed on each other straight in front of the patient. And that was called confusion.

Option 2 - definition of a horopter
Option 3 - definition for Identical visual direction
Option 4 - definition for zero vergence

pg 42

pg120

pg. 44

The foveas are no longer connected in an anomalous corresponding system. This means that in an anomalous corresponding system, the foveas, which are the central areas of the retina responsible for sharp central vision, do not communicate or work together as they should in a normal corresponding system. This lack of connection between the foveas can result in visual abnormalities or difficulties in binocular vision.

Option 3 - that's a characteristic of suppression

pg.117

Mallet - only measures the amount of prism to align the nonius lines

pg. 56

Option 1 - that's what the fixation disparity curves tell us
H values determine the shape of the horopter and it’s the deviation from the VM circle. If it deviates away from the VM circle then H is positive if it deviates inside the VM circle H is negative.

pg.116

Option 2 - repetition blindness

Anomalous correspondence (AC) refers to a condition where the visual system adapts to a strabismus (eye misalignment) by establishing a new correspondence between the fovea of one eye and a non-foveal point in the other eye. Unharmonious AC occurs when the angle of anomaly (deviation from normal correspondence) and the objective angle (actual angle of strabismus) are not equal. This means that the visual system has not fully adapted and the correspondence is not completely aligned. Therefore, the statement "In unharmonious AC the angle of the anomaly and the objective angle are equal" is incorrect.

The problem or the major criticism of Sensory theory is that it depends on very precise amounts of deviation. Because if I have it wired for 20D Esotropia and then all of a sudden it changes to a 10D, then the system isn’t wired for that. So the Sensory Theory has a hard time accounting for changes in eye turn. As we know clinically that some pts change their eye turn and their correspondence system adjusts for that. And that’s it’s the principle of co-variation, that the variation in my anomalous system varies by the angle of deviation.

The question asks for the selection mechanism that was not discussed in the lecture. The lecture discussed orientation, selection, and sustaining as selection mechanisms. Sorting, on the other hand, is not mentioned as a selection mechanism in the lecture. Sorting refers to limiting the number of distractors one pays attention to, which is not discussed as a selection mechanism in the lecture.

pg. 117

pg 118

Example for Harmonious anomalous correspondence - the angle of anomaly will be equivalent to the objective angle. This person fuses but moves on the cover test.

Flom had the high exphore or exotrope who can fuse, they have a curve with a negative H value so it’s inside the V-M circle.