نتایج جستجو برای: spatial discrimination

تعداد نتایج: 423048  

Journal: :Journal of Experimental Psychology: Animal Behavior Processes 2005

Journal: :Vision research 1991
S Magnussen M W Greenlee R Asplund S Dyrnes

The retention of spatial information in visual short-term memory was assessed by measuring spatial frequency discrimination thresholds with a two-interval forced-choice task varying the time interval between the two gratings to be compared. The memory of spatial frequency information was perfect across 10-sec interstimulus intervals. Presentation of a "memory masker" grating during the intersti...

Journal: :Vision Research 1998
Yue Chen Harold E. Bedell Laura J. Frishman Dennis M. Levi

Velocity discrimination thresholds were determined for 1 c/deg drifting gratings when uncertainty about the reference velocity was introduced by interleaving stimuli with different reference velocities from trial to trial. When drifting gratings with reference velocities spanning 4 octaves (1-16 deg/sec) were mixed randomly within a series of trials, the velocity discrimination threshold for a ...

Journal: :Vision Research 1998
Martin Lages Michel Treisman

A long-term sensory memory is believed to account for spatial frequency discrimination when reference and test stimuli are separated by long intervals. We test an alternative proposal: that discrimination is determined by the range of test stimuli, through their entrainment of criterion-setting processes. Experiments 1 and 2 show that the 50% point of the psychometric function is largely determ...

Journal: :Journal of cognitive neuroscience 2006
Ahmed A. Karim Anne Schüler Yiwen Li Hegner Eva Friedel Ben Godde

Recent neuroimaging studies have revealed that tactile perceptual learning can lead to substantial reorganizational changes of the brain. We report here for the first time that combining high-frequency (15 Hz) repetitive transcranial magnetic stimulation (rTMS) over the primary somatosensory cortex (SI) with tactile discrimination training is capable of facilitating operant perceptual learning....

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