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Biomedical subjects

P Goolkasian

Publications and source records attributed to P Goolkasian.

23 records · Page 2Linked to original sources
PubMed1980

Processing of visually presented clock times.

The encoding and representation of visually presented clock times was investigated in three experiments utilizing a comparative judgment task. Experiment 1 explored the effects of comparing times presented in different formats (clock face, digit, or word), and Experiment 2 examined angular distance effects created by varying positions of the hands on clock faces. In Experiment 3, encoding and processing differences between clock faces and digitally presented times were directly measured. Same/different reactions to digitally presented times were faster than to times presented on a clock face, and this format effect was found to be a result of differences in processing that occurred after encoding. Angular separation also had a limited effect on processing. The findings are interpreted within the framework of theories that refer to the importance of representational codes. The applicability to the data of Bank's semantic-coding theory, Paivio's dual-coding theory, and the levels-of-processing view of memory are discussed.

Discrimination Learning↗
PubMed1978

Eye movements and a dynamic stimulus situation.

Two experiments were conducted to investigate performance with and without voluntary eye movements in a dynamic stimulus situation. Experiment I used a combined tracking and prediction task. Level of training, complexity of the signal, and visual region sampled were the variables of interest. Experiment II manipulated the same variables in only the prediction task. Thus, the amount of attention allotted to the prediction task was varied between experiments. The d' measure indicated that under peripheral vision instructions accuracy on the prediction task was the same as under foveal vision instructions provided that: (1) the level of task complexity was low, (2) the subjects were well trained, and (3) only the prediction task was performed, or in the dual task situation only visual regions near the fovea were sampled. All other combinations of the variables resulted in a lower performance scores under peripheral vision instructions. Results are interpreted within the framework of current theories of the functional visual field.

Eye Movements↗
PubMed1978

Reading and detecting color-word stimuli presented at various retinal locations.

Four experiments, using a total of 70 male and female undergraduates, examined the speed and accuracy of reading and detection responses to color-word stimuli presented at retinal locations from the center out to 6 degrees in the right and left visual fields. Reading and detection responses were found to interact with retinal location. For stimuli presented at the farther retinal location, detection responses were quicker and more accurate than reading responses, but the reverse occurred with foveally presented stimuli. The Stroop phenomenon was present in the detection data and was found to be diminished with parafoveal presentation of the stimulus materials. These findings support the peripheral search guidance process of Hochberg's model of reading and provide added evidence of processing variations across retinal location.

Color Perception↗