Subjects learned and recognized patterns which were marginally visible, requiring them to fixate directly each feature to which they wished to attend. Fixed "scanpaths," specific to subject and pattern, appeared in their saccadic eye movements, both intermittently during learning and in initial eye movements during recognition. A proposed theory of pattern perception explains these results.

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7wo studies of premenstrual syndrome (PMS), EEG, and photic stimulation have recently been completed at the Royal Postgraduate Me dical School, Hammersmith Hospital, London (UK). In a preliminary trial of photic stimulation as a treatment for PMS, seventeen women with PMS were treated with a take-home flashing light device for 15 to 20 minutes per day throughout their cycle. At the end of three months of treatment the median reduction in PMS symptoms for the 17 patients was 76%, and twelve of the 17 patients technically no longer had PMS. Separately, an EEG study of six women with PMS demonstrated that when they were premenstrual their EEGs showed more slow ( delta) activity and slower P300 evoked response than when they were mid-cycle. These results are discussed in the conte."(.t of other known "slow brainwave" disorders, such as ADD and Minor Head Injury, and various theoretical explanations are proposed.

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