Similarities of either artificial or natural groups are extractable by our visual system in terms of ensemble perception. On the other hand cognitive linguistics postulates that changing mental image schema for describing a scene from global to local and vice versa is obvious in our daily conversations. Here we hypothesized that global or local priming of participants would modulate their threshold in mean discrimination task (MDT). Thereby, 10 right-handed , 14 years old participants went through an ABBA within-subject counterbalance design to compare 4 pairs of collective and singular nouns priming effect by successive ensemble size perception task(MDT) including a display of random circles sizes and then a mean discrimination task to decide which one of the test circles match the previous display mean circle size. Our preliminary results demonstrate Persian collective nouns in comparison to singular nouns could decrease threshold to distinguish mean circle sizes in last display.

Some people experience sequences like numbers allocated to a specific part of space which is well-known as sequencespace synesthesia. On the other hand, covert attention is orienting of attention without the head, eyes, or body movementis the (mental) moving of attention toward a stimulus. Here, We used previous findings in sequence space synesthesia byusing an auditory number sequence numbers and covert spatial attention together with cognitive grammar theory includingprofiling to assess the possibility to shift covert attention towards a specific part of a bistable picture. Our participants were14 years old adolescents learning English at the pre-intermediate level in a school in Tehran which went through within-subject experiment. Results showed shorter reaction time for a sentence with trajectory congruent with covert attended partof the bistable picture compared to the condition without such attentional shift by t value as -4.466 within 95% confidenceinterval.