A normally visible stimulus can be rendered invisible by some psychophysical techniques. Flash suppression and forward masking are two such techniques. In this study, we investigated the selectivity ...of suppression in flash suppression and forward masking. Observers were asked to discriminate the orientation or color of the test grating that was at the orientation-discrimination threshold. We found that during flash suppression color sensitivity was more suppressed than orientation sensitivity. Forward masking produced a pattern of results similar to flash suppression. These results suggest that the flash suppression and forward masking share partly a common mechanism.
Ultrasound examination was performed with 7.5MHz transducer on 9 patients (10 wrists) with lateral epicondylitis of the elbow. There were 5 men and 4 women. Their age ranged from 40 to 57 years with ...a mean age of 47.9 years. The period of suffering ranged from 1 month to 3 years, with a mean duration of 11.4 months. Normal cases were also studied for comparison. Ultrasound examination included longitudinal scan of the ECRB and EDC, and transverse scan of the lateral epicondyle of the elbow. The longitudinal and transverse scan of the ECRB and EDC showed enthesopathy with hypoechoic thickened extensor tendon. Ultrasonography seems to be useful for the evaluation of the degree of degeneration at the extensor tendon insertion.
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